C# API

Cadaclysm.Open()

static Scene Open(string path, Convention convention = Convention.Native, string? schema = null, bool colours = false, double sourceMetresPerUnit = 0)

Open a CAD file and read its tree. The format comes from the extension (a .zip opens its first readable member — Scene.SourceName says which). The tree is read now and the geometry is built lazily, node by node, when it is first asked for.

convention is the space to read into — a Convention, optionally with the file-units and world-UV flags — and the library converts everything it hands back into it. schema names an extra EXPRESS schema (.exp, or a directory of them); every schema the SDK ships is already built in, so it is needed only for one the library does not carry. colours asks for per-vertex colours on bodies the file painted in more than one colour.

Never returns an empty handle: on failure it throws CadaclysmException carrying the library's reason.

Cadaclysm.OpenMemory()

static unsafe Scene OpenMemory(ReadOnlySpan<byte> bytes, string name, string? format = null, string? schema = null, Convention convention = Convention.Native, bool colours = false)

Open a file already in bytes — a download, a database blob, an archive member. With no file name to take the format from, it is named as an extension would name it: step, ifc, igs, 3dm, brep, scad (a leading dot is fine). The bytes are copied; the buffer can be reused as soon as this returns. Otherwise as Cadaclysm.Open().

Cadaclysm.Version()

static string Version()

The version of the library actually loaded — the one worth reporting in a bug.

Cadaclysm.BuildDate()

static string BuildDate()

When the loaded library was built, YYYY-MM-DD. A licence covers every build dated on or before its expiry.

Cadaclysm.License()

static void License(string textOrPath)

Load a licence: the certificate text, or the path of a file holding it. Without this call the library looks in the CADACLYSM_LICENSE environment variable, then for cadaclysm.lic beside the executable and in the working directory. On a licence that does not verify it throws CadaclysmException with the reason, and the previous licence (if any) stays in use.

Cadaclysm.LicenseInfo()

static string LicenseInfo()

One line about the licence in use — customer=… expiry=… entitlements=… — or unlicensed (unlicensed -- <reason> when a licence was found but did not verify). Never null.

Cadaclysm.LicenseNoticeCount()

static ulong LicenseNoticeCount()

How many unlicensed notices the library has printed to stderr in this process. An application with no console to watch (a GUI, a game) can poll this and show its own banner.

Cadaclysm.MeshFormats()

static IReadOnlyList<MeshFormat> MeshFormats()

Every mesh format Node.SaveMesh() writes, with its file extension: stl, stl-ascii, msh (Gmsh), glb, gltf and obj in this release. Build a save menu from this list rather than hard-coding it, and a format added to the library appears without a code change.

Cadaclysm.PickFile()

static string? PickFile()

Ask the user for a file through the platform's own open dialog, filtered to what this build can read. null when they cancel or no dialog is available (on Linux, neither an XDG portal nor zenity). Blocks until the user acts; on macOS call it from the main thread.

Cadaclysm.DeclaredSchema()

static string DeclaredSchema(string modelPath)

The schema a STEP or IFC file says it speaks (its FILE_SCHEMA line), read from the first few kilobytes — cheap even on a very large file. Empty when it names none.

Cadaclysm.ResolveSchema()

static (string? Chosen, IReadOnlyList<string> Fallbacks) ResolveSchema(string modelPath, string? schema)

Which .exp of a schema directory matches a model: the chosen file, or — when the file's declared name resembles none of them — the whole list as fallbacks to try in turn. Cadaclysm.Open() does this itself when given a directory; this is for a caller that wants to report the choice.

Cadaclysm.LibraryPath

Where the shared library was found: CADACLYSM_LIBRARY (a file or a directory) first, then beside the wrapper, then a lib/ directory in any parent (the SDK's layout).

The .NET loader finds the library as described under Install.

Cadaclysm.None

The node index the C API uses for "no such node" (CADACLYSM_NONE, 0xFFFFFFFF). The wrappers turn it into null where a node may be missing (Node.Parent, Node.InstanceOf), so it matters only when reading raw indices.

Missing nodes are null.

Scene.Close()

void Close()

Give the document back. Idempotent. Every mesh and polyline view still held reads freed memory afterwards (the wrappers that can tell refuse to read them).

Scene.Closed

bool Closed

Whether Scene.Close() has run.

Scene.Path

string Path

The file it was read from, or the name given to Cadaclysm.OpenMemory().

Scene.SchemaPath

string? SchemaPath

The .exp actually used, or null — worth reporting when a directory was passed.

Scene.Convention

Convention Convention

The convention it was opened with. Nothing the library hands back says what space it is in, and every array out of this scene is in this one.

Scene.Version

string Version

The version of the library that read it.

Scene.Schema

string Schema

The schema the file named, or empty for a format that names none.

Scene.SchemaRead

string SchemaRead

The schema that actually read it. A file declaring a release candidate reads under the finished schema of the same version where that is what is built in; a file whose schema is unknown reads under the one that defines its entity types.

Scene.Substituted

bool Substituted

Whether something other than the file's own schema read it — Scene.Schema and Scene.SchemaRead differ.

Scene.MetresPerUnit

double MetresPerUnit

What one length unit in the file is worth in metres; 1 where the file did not say.

Scene.Bounds

Bounds Bounds

Everything the model covers, in world coordinates — the one figure not in a node's own frame. This meshes the whole model, being the only way to know how far it reaches; to frame a view quickly, use the bounds of the nodes already built.

Scene.Diagnostics

IReadOnlyList<string> Diagnostics

What the file held that the reader could not build, one line each.

Scene.SourceName

string? SourceName

The archive member this was read from, or null for a plain file.

Scene.Nodes

IReadOnlyList<Node> Nodes

Every node, in index order: assemblies, shapes, layers, storeys — structure as well as geometry. To draw, iterate Scene.Placements instead.

Scene.Roots

IReadOnlyList<Node> Roots

The nodes nothing else contains: where a tree view starts.

Scene.Walk()

IEnumerable<Node> Walk()

Every node reachable from the roots, parents before children.

Scene.Query()

IReadOnlyList<Node> Query(string filter)

The indices of the nodes a filter matches, in document order. The filter is one boolean expression in the query language — class == ON_Brep and within(name == Walls). A filter that does not parse throws CadaclysmException with the parser's message and position; one that matches nothing is an empty result, not an error.

Returns the matching nodes.

Scene.Placements

IReadOnlyList<Placement> Placements

What the document draws, and where. Not the nodes: a block or an instanced part is one node of geometry drawn at several places, and a node walk draws it once at its definition's frame. Iterate this to draw, and the nodes to build a tree. See Placement.

Scene.RealizeAll()

uint RealizeAll()

Build every mesh now, across all cores, and return how many were built. Reading is lazy so a tree can be on screen while the shapes are still coming; asking node by node meshes on one core, this uses them all. Watch it from another thread with Scene.Realized and Scene.RealizeTotal; stop it with Scene.Cancel().

Scene.Realized

uint Realized

How many nodes Scene.RealizeAll() has finished. Safe to read from another thread.

Scene.RealizeTotal

uint RealizeTotal

How many it will build in all; zero until it starts.

Scene.Cancel()

void Cancel()

Ask a running Scene.RealizeAll() to stop. One-way for the life of the scene: later calls return at once, and meshes are still built one node at a time on request.

Scene.Save()

void Save(string path, string format = "glb")

Write the whole scene: glb (binary glTF), gltf (text glTF, one file) or obj (every placement baked to its own named object, with a .mtl beside it when anything has a colour). Every placement of every shape, named and placed as the tree is, one material per colour; in the scene's convention (use Y-up metres for the space glTF specifies). A format outside these three, or a failed write, throws CadaclysmException.

Scene.SurfaceMatrix

float[,] SurfaceMatrix

The 4×4 that puts Node.Surfaces into the space everything else is already in. Meshes and polylines arrive in the scene's convention; surfaces arrive in the file's own frame, because converting a surface means converting its parameter space too. Identity for a document opened in its native convention and units.

Scene.Show

Draw every visible placement — each block instance where the file puts it — with the viewer in use. Keywords: view= (front, back, left, right, top, bottom, iso), az=, el=, zoom=, up= (default from the convention the scene was opened with), edges= (the B-rep edges over the shapes; free curves are drawn either way), width=, height=, hint=. No tolerance=: a document is drawn at the tolerance it was read with.

Comes with the viewers follow-up.

Scene.View

Orbit the model with the viewer in use; returns (azimuth, elevation, zoom) where it was left.

Comes with the viewers follow-up.

Node.Scene

Scene Scene

The scene it belongs to.

Node.Index

uint Index

Its index in the scene, stable while the scene is open: a key for a map of what has been uploaded.

Node.Name

string Name

The name the file gave it, or empty.

Node.Id

string Id

What the file calls it: a STEP #N, an IFC GlobalId, a Rhino object id.

Node.Kind

string Kind

Its type in the file: an IFC class, an openNURBS class, a STEP shape kind.

Node.Label

string Label

Something to put in a tree row: the name, else the kind, else #index.

Node.Depth

uint Depth

How far down the tree it sits; a root is zero.

Node.Generator

string Generator

What its geometry was before it was triangles — brep, mesh, csg — or empty for a node that draws nothing.

Node.Visible

bool Visible

Whether the file says to show it when opened. The node's own switch, not inherited; true where the format has no such switch.

Node.VisibleNow

bool VisibleNow

Node.Visible with every ancestor consulted: a layer switched off hides what hangs under it.

Node.Locked

bool Locked

Whether the file says it cannot be selected or edited (Rhino's lock, own or by layer). A locked node is still drawn.

Node.Parent

Node? Parent

The node containing this one, or null for a root.

Node.Children

IReadOnlyList<Node> Children

The nodes directly under this one.

Node.InstanceOf

Node? InstanceOf

The node whose geometry this one places, or null. A part placed seventy times is one mesh and seventy transforms; this is how a caller knows to upload it once.

Node.SelectAs

Node SelectAs

What a click on this node's geometry should select — usually itself. Formats that hang geometry under the object it belongs to (an IFC representation under its product) point back at the object.

Node.Attributes

IReadOnlyList<Attribute> Attributes

Everything the file said about the node, as Attribute values.

Node.CanMesh

bool CanMesh

Whether the node has geometry of its own to draw. Builds nothing; most nodes are structure and answer false.

Node.Colour

float[]? Colour

The colour the file gave it as RGBA in 0–1, or null — most STEP files carry none, and the caller's default is the right answer.

Node.Transform

double[,] Transform

Where the node's geometry sits: a 4×4 in double precision, composed through every frame above it. Meshes stay single precision in their own frame under a double transform, so a model at survey coordinates keeps its millimetres.

Node.RawTransform

double[] RawTransform

The same matrix as 16 numbers in the C API's column-major order, ready for a GPU uniform.

Node.Bounds

Bounds Bounds

The extent of the node's geometry in that geometry's own frame. Builds the geometry if needed; carry it through Node.Transform for world coordinates.

Node.Mesh

Mesh? Mesh

Its triangles in their own frame, built now if they have not been. A node that instances another hands back the instanced node's arrays — the same memory for every placement. The arrays are views into the scene; see Lifetimes.

Node.Surfaces

Surfaces Surfaces

Its faces as exact surfaces plus the trim loops that cut them, each in the surface's own (u, v). Nothing is meshed to produce it, and reading it costs Node.Mesh nothing. Empty where the reader has no parametric description (a tessellated body, a mesh format). In the file's frame — see Scene.SurfaceMatrix.

Node.Edges

Polylines Edges

Its feature edges as polylines, for an outline overlay. Builds the geometry if needed.

Node.Brep

Brep? Brep

Its exact B-rep, as a Brep, for the kernel's Solid.FromNode() to operate on — or null where it has none (a mesh, a curve, a CSG body, a JT or OpenSCAD part). Shared with the scene, not copied.

Node.Curves

Polylines Curves

Its free curves as polylines; a 2D drawing is all of these.

Node.Isocurves

Polylines Isocurves

Lines ruled across its surfaces, so a curved face reads as curved in a wireframe. A flat face yields its outline, so these can overlap Node.Edges.

Node.SaveMesh()

void SaveMesh(string path, string format = "stl")

Write this node's own mesh — where it is defined, without its placement — in one of Cadaclysm.MeshFormats(). A node that draws nothing, or an unknown format, throws CadaclysmException; ask Node.CanMesh first to grey out a menu entry. To write the whole model, see Scene.Save().

Node.Walk()

IEnumerable<Node> Walk()

This node and every node under it, parents before children.

Node.Show

Draw what this node and everything under it places with the viewer in use. Keywords as Scene.Show.

Comes with the viewers follow-up.

Node.View

Orbit this node and everything under it; returns (azimuth, elevation, zoom) where it was left.

Comes with the viewers follow-up.

Brep.Pointer

The brep's C pointer, which the kernel's wrapper hands across. throws CadaclysmException once released.

Internal: Solid.FromNode takes the node, not the pointer.

Brep.LayoutId

static string LayoutId

How this library lays a brep out in memory: its compiler, target and source. The kernel shares a brep only with a reader whose id equals its own.

Brep.Manifold

Manifold Manifold

Whether its faces make a manifold — every edge bordered by one face or two, the faces round every vertex one fan — and whether it is closed, as a Manifold. Read off the topology the file wrote, not a mesh. throws CadaclysmException once released.

Brep.Dispose()

void Dispose()

Give the reference back now. Leaving a with block, or the garbage collector, does it otherwise.

Placement.Scene

Scene Scene

The scene it belongs to.

Placement.Index

uint Index

Its index in Scene.Placements.

Placement.Geometry

Node Geometry

The node whose mesh, edges and curves this draws.

Placement.Select

Node Select

What a click on this drawing selects: the placement's own node rather than the shared shape, which would light up every copy.

Placement.Transform

double[,] Transform

Where to draw it: a 4×4, already composed through every frame from the root.

Placement.RawTransform

double[] RawTransform

The same matrix as 16 numbers, column-major.

Mesh.Positions

ReadOnlySpan<float> Positions

Three floats a vertex.

Mesh.Normals

ReadOnlySpan<float> Normals

Three floats a vertex, or null for a mesh that carries none.

Mesh.Uvs

ReadOnlySpan<float> Uvs

Two floats a vertex, or null: only readers asked for world-scale UVs fill them. One unit of u or v is one world unit, so faces overlap in UV space — a tiling material, not a lightmap.

Mesh.Colours

ReadOnlySpan<float> Colours

Four floats (RGBA) a vertex, or null — the common case. Only a body painted in several colours, opened with colours on, carries them.

Mesh.Indices

ReadOnlySpan<uint> Indices

Three vertex indices a triangle, unsigned 32-bit.

Mesh.VertexCount

uint VertexCount

How many vertices.

Mesh.IndexCount

uint IndexCount

How many indices: three a triangle.

Mesh.TriangleCount

uint TriangleCount

How many triangles.

Mesh.Copy()

MeshData Copy()

The same arrays in memory of your own, safe to keep after Scene.Close(). Deliberately visible: on a large model this is where the gigabytes go.

Polylines.Positions

ReadOnlySpan<float> Positions

Three floats a point, the runs end to end.

Polylines.Counts

ReadOnlySpan<uint> Counts

How many points each run has, in order.

Polylines.PolylineCount

uint PolylineCount

How many runs.

Polylines.VertexCount

uint VertexCount

How many points in all.

Polylines.SegmentIndices()

int[] SegmentIndices()

Index pairs into the positions, two per line segment — what GL_LINES and every pair-taking API want. Indices rather than points, so a caller can transform the points once and expand afterwards.

Polylines.Segments()

float[] Segments()

The segment endpoints themselves, two points per segment.

Surfaces.Faces

The faces, one per trimmed face of the body.

Surfaces is itself a read-only list of Face.

Face

readonly struct Face
uint Kind
float[] Origin
float[] Domain
float[] Scalars
float[][] Loops
float[] Nurbs

One trimmed face. kind is the surface: 0 plane, 1 cylinder, 2 cone, 3 sphere, 4 torus, 5 revolution, 6 extrusion, 7 NURBS, 8 sum. origin, ax, ay, az are its frame, scalars its kind-dependent sizes (radius, angle…) and domain its (u min, v min, u max, v max). loops holds the trim loops as (u, v) points, each closing implicitly; profile, profile2 and nurbs carry what a swept or NURBS surface needs. reversed flips the normal; transposed swaps u and v. The C header's CadaclysmFace is the full description.

Bounds.Min

float[] Min

The low corner.

Bounds.Max

float[] Max

The high corner.

Bounds.IsEmpty

bool IsEmpty

Whether this is the all-zero box that stands for nothing.

Bounds.Size

float[] Size

The extent along each axis.

Bounds.Centre

float[] Centre

The midpoint.

Attribute.Name

string Name { get; }

What the file called it.

Attribute.Kind

ValueKind Kind { get; }

Which kind of value it holds — a ValueKind. Lets a caller tell a reference from prose, or total the numbers.

Attribute.Value

string Value { get; }

The value, in the language's own type where it has one for the kind.

A string in this wrapper; Kind says how to read it.

Attribute.Text

string Text

The value rendered for display, identically in every wrapper: true/false, reals in their shortest exact form, lists as [a, b, c].

Convention

enum Convention : uint
Native
Unreal
Unity
YUp
Blender

The presets: NATIVE keeps the file's own axes and units; UNREAL is Z up, left-handed, centimetres; UNITY Y up, left-handed, metres; Y_UP Y up, right-handed, metres (glTF, three.js, most real-time engines); BLENDER Z up, right-handed, metres.

ConventionFlag.FileUnits

const uint FileUnits

Combine with a preset to keep its axes but the file's own units.

ConventionFlag.UvWorld

const uint UvWorld

Combine with a preset to ask for world-scale texture coordinates in Mesh.Uvs. Off by default: eight bytes a vertex nobody asked for.

Cadaclysm.ParseConvention()

static Convention ParseConvention(string text)

A convention from a name a user typed: unreal, or unreal+file-units. An unknown name throws CadaclysmException listing the accepted ones, rather than silently reading as native.

ValueKind

enum ValueKind
None
Text
Integer
Real
Boolean
List
Reference

TEXT, INTEGER, REAL, BOOLEAN; LIST (the elements rendered as [a, b, c]); REFERENCE (another entity, by the id the file gave it, so it can be followed rather than shown as prose); NONE for an attribute that had no value.

Manifold.Faces

int Faces

How many faces.

Manifold.Edges

int Edges

How many distinct edges: one shared by two faces counts once.

Manifold.Vertices

int Vertices

How many distinct vertices.

Manifold.BoundaryEdges

int BoundaryEdges

Edges only one face borders: a sheet's rim, a hole in a shell.

Manifold.NonManifoldEdges

int NonManifoldEdges

Edges three or more faces border: a fin, or two solids meeting along a line.

Manifold.NonManifoldVertices

int NonManifoldVertices

Vertices whose faces make more than one fan: two solids touching at a corner.

Manifold.IsManifold

bool IsManifold

No non-manifold edge or vertex: a manifold, possibly with a boundary.

Manifold.IsClosed

bool IsClosed

A manifold with no boundary edge either: it encloses a solid.

Blacksmith.WriteStep()

static void WriteStep(string path, IEnumerable<Solid> solids, string? schema = null, string unit = "mm")

Write several solids as one STEP file, each its own body. unit is mm, m or in. schema is left out for AP203 (built in — no file needed), the name of another built-in schema such as AP242's AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF (AP214's AUTOMOTIVE_DESIGN cannot carry the writer's mechanical_context), or a custom EXPRESS schema: a path to its .exp or its text.

Blacksmith.WriteStepText()

static string WriteStepText(IEnumerable<Solid> solids, string? schema = null, string unit = "mm")

The same STEP file as text, for a caller that stores or sends it rather than writing a file.

Blacksmith.DefaultSchema()

static string DefaultSchema()

Where an ap203.exp file is found (CADACLYSM_SCHEMAS, else schemas/ in a parent). No longer needed to write STEP: the kernel's AP203 is built in.

Blacksmith.Version()

static string Version()

The version of the kernel library actually loaded.

Blacksmith.BuildDate()

static string BuildDate()

When the loaded kernel was built, YYYY-MM-DD.

Blacksmith.License()

static void License(string textOrPath)

Load a licence into the kernel — the text, or a file's path. The reader has its own call; the same file works for both.

Blacksmith.LicenseInfo()

static string LicenseInfo()

One line about the kernel's licence, or unlicensed. Never null.

Blacksmith.LicenseNoticeCount()

static ulong LicenseNoticeCount()

How many unlicensed notices the kernel has printed to stderr in this process.

Blacksmith.BrepLayoutId()

static string BrepLayoutId()

How the loaded kernel lays a brep out in memory: its compiler, target and source. Solid.FromNode() works only where this equals the reader's Brep.LayoutId — the two libraries from the same release.

Blacksmith.LibraryPath

Where the kernel library was found: CADACLYSM_BLACKSMITH_LIBRARY first, then as the reader's.

See Install.

Profile.Rect()

static Profile Rect(double w, double h)

A w × h rectangle centred on the origin.

Profile.Circle()

static Profile Circle(double r)

A circle of radius r about the origin.

Profile.Slot()

static Profile Slot((double X, double Y) centre, double length, double r)

A slot (stadium) length long overall, with end radius r, centred on centre and running along x. length must exceed 2 * r.

Profile.Polygon()

static Profile Polygon(IEnumerable<(double X, double Y)> points)

A closed polygon through the points, in order, its side back to the first point a segment of its own. At least three points.

Profile.RegularPolygon()

static Profile RegularPolygon((double X, double Y) centre, double radius, int sides, double angle = 0)

A regular polygon of sides sides (at least 3) on the circle of radius about centre, its first corner at angle radians from the sketch's x axis (0 by default), the rest counter-clockwise.

Profile.Spline()

static Profile Spline(IEnumerable<(double X, double Y)> points, int degree = 3, IEnumerable<double>? weights = null, bool closed = false)

A spline of degree (3 by default) through the control polygon points, weights one per point or null. Open, it starts on the first point and ends on the last: an open chain, for Solid.ExtrudeOpen() or Profile.Chain(). Closed, it is periodic — smooth through its own start, no corner there — and a closed profile. The degree is lowered to fit the points; a degree of zero, too few points (two open, three closed) or a weight not positive throws BuildException.

Profile.Path()

static Path Path((double X, double Y) start)

Start drawing an outline segment by segment at start; see Path.

Profile.Chain()

static Profile Chain(IEnumerable<Profile> pieces, double tolerance = 1e-6)

Open profiles — paths ended open — joined end to end into one: the forge's merge. They may come in any order and either way round: each next piece is the first of the rest with an end within tolerance (1e-6 by default) of either end of the chain so far, reversed where that makes it meet. Every segment is kept exactly — a line a line, an arc an arc, a spline the same spline. Closed where the chain's two ends meet, otherwise an open chain. A piece that is empty, has holes, is closed on its own or meets none of the others throws BuildException naming it by its index.

Profile.FromLoops()

static Profile FromLoops(IEnumerable<Profile> loops)

Closed loops, in any order, as one profile: the loop enclosing the most area is the boundary and every other a hole in it, in the order given — a sketch's rectangle and the circles drawn inside it. Each loop is a closed profile with no holes of its own, wound either way; one that closes within rounding is closed exactly. A loop that is open, empty or encloses no area, loops that cross or touch, a hole outside the boundary, or one inside another hole (an island) throws BuildException, naming the loops by their index.

Profile.CloseLoop()

Profile CloseLoop()

This profile closed — the forge's sketch "close": where its last segment stops short of its start (a path ended open), a straight segment back to it; where it already comes back within 1e-9 of its extent, its last segment made to land on the start exactly. A closed profile comes back as it is, and holes are closed the same way.

Profile.WithHole()

Profile WithHole(Profile hole)

This outline with hole cut out of it.

Profile.Translate()

Profile Translate(double dx, double dy)

This outline moved by (dx, dy).

Profile.Round()

Profile Round(double radius, IEnumerable<int>? corners = null, bool open = false)

This outline with its corners rounded by radius: where two straight segments meet, both are cut back and an exact arc tangent to both goes between them; a corner next to an arc or a spline is left as it is. With no corners every such corner is rounded, the holes' too; a list picks corners of the outline — corner k is where segment k ends. open reads the profile as an open chain whose two ends stay square. A radius that does not fit throws BuildException naming the corner.

Profile.Polylines

The outline, then each hole, as polylines at z = 0 within tolerance of its arcs and splines — what a viewer draws it with. A closed loop repeats its first point at the end; an open chain (a profile ended open) stays open. Views, like Solid.Mesh().

Declared (cadaclysm_blacksmith_profile_polylines); the method comes with the viewers.

Profile.Show

Draw the outline and holes with the viewer in use, from the top by default. Keywords as Solid.Show; edges= is ignored, the lines being the whole picture.

Comes with the viewers follow-up.

Profile.View

Orbit the outline with the viewer in use; returns (azimuth, elevation, zoom) where it was left.

Comes with the viewers follow-up.

Path.LineTo()

Path LineTo(double x, double y)

A straight segment to (x, y).

Path.ArcTo()

Path ArcTo(double x, double y, (double X, double Y) centre, bool ccw = true)

A circular arc to (x, y) about centre, counter-clockwise unless ccw is false.

Path.BezierTo()

Path BezierTo((double X, double Y) c1, (double X, double Y) c2, (double X, double Y) to)

A cubic Bézier through control points c1, c2 to to.

Path.NurbsTo()

Path NurbsTo(IEnumerable<(double X, double Y)> control, IEnumerable<double> knots, uint degree, IEnumerable<double>? weights = null)

A NURBS segment: control is every control point after the current one, the endpoint last; knots the full knot vector; weights one per control point including the current one, or null for a non-rational curve.

Path.End()

Profile End()

Close the outline back to its start and return the Profile.

Path.EndOpen()

Profile EndOpen()

The path as it stands, not closed: an open chain for Solid.ExtrudeOpen(), Solid.SweepOpen() or Solid.LoftOpen().

SweepPath.At()

static SweepPath At((double X, double Y, double Z) point)

Start a path at a 3D point.

SweepPath.Along()

static SweepPath Along(Profile curve, double[] frame, double tolerance = 0.05, bool open = true)

The path a 2D chain (usually from Path.EndOpen()) draws on frame: a line a straight piece, an arc a circular one, a Bézier or spline fitted with biarcs — arcs tangent to each other and to the curve — within tolerance, so the path is tangent throughout and the sweep exact along it. open false closes the path back to its start.

SweepPath.LineTo()

SweepPath LineTo((double X, double Y, double Z) point)

A straight piece to a 3D point.

SweepPath.Arc()

SweepPath Arc((double X, double Y, double Z) centre, (double X, double Y, double Z) axis, double angle)

Turn angle radians (in (0, 2π]) about the axis through centre along axis.

SweepPath.Dispose()

void Dispose()

Free the path.

Slant.At

double At

The height at the sketch origin.

Slant.Grad

(double X, double Y) Grad

The slope in x and y.

Slant.Flat()

static Slant Flat(double at)

A flat plane at height at.

Slant.OfPlane()

static Slant OfPlane(double[] frame, (double X, double Y, double Z) point, (double X, double Y, double Z) normal)

The plane through point square to normal, as heights over frame. A plane that contains the extrusion direction has no height and throws BuildException.

Frame.Xy()

static Frame Xy((double X, double Y, double Z) origin = default)

The world XY plane through origin: z up, as Workplane.Xy().

Frame.Xz()

static Frame Xz((double X, double Y, double Z) origin = default)

The world XZ plane through origin: x along X, y along Z, so z is -Y, as Workplane.Xz().

Frame.Yz()

static Frame Yz((double X, double Y, double Z) origin = default)

The world YZ plane through origin: x along Y, y along Z, so z is +X, as Workplane.Yz().

Frame.At()

static Frame At((double X, double Y, double Z) origin, (double X, double Y, double Z) normal, (double X, double Y, double Z)? x = null)

The plane through origin square to normal, which becomes the frame's z (it need not be unit). Its x axis is x laid onto that plane; with none, world X laid onto it, or world Y when the normal is within about 25° of X — the axes Solid.FaceFrame() gives a face facing normal. So a normal along +Z, -Y or +X gives exactly Frame.Xy(), Frame.Xz() or Frame.Yz(). A zero normal, or an x along the normal, throws BuildException.

Frame.Of()

static Frame Of(double[] frame)

Twelve numbers — what Solid.FaceFrame() and Workplane.Frame hand back — as a checked frame, to read its axes or move it.

Frame.Midplane()

static Frame Midplane(Frame a, Frame b)

The plane midway between the planes of frames a and b — Fusion's midplane: for parallel planes the one halfway between, on a's axes; for planes that meet, the plane bisecting them through the line they meet on, its x along that line.

Frame.Through()

static Frame Through((double X, double Y, double Z) p, (double X, double Y, double Z) q, (double X, double Y, double Z) r)

The plane through the points p, q and r: its origin p, its x towards q, its z the normal the three turn about counter-clockwise. Three points on one line throws BuildException.

Frame.Origin

(double X, double Y, double Z) Origin
(double X, double Y, double Z) X
(double X, double Y, double Z) Y
(double X, double Y, double Z) Z

The origin and the three axes, each three numbers.

Frame.Translate()

Frame Translate(double dx, double dy, double dz)

This frame moved by (dx, dy, dz) in world coordinates.

Frame.Offset()

Frame Offset(double distance)

This frame moved distance along its own z: Frame.xy().offset(5) is the XY plane at z = 5.

Workplane.Xy()

static Workplane Xy()

Start on the XY plane at the origin (Z up). Workplane.Xz() and Workplane.Yz() start on the other two.

Workplane.Xz()

static Workplane Xz()

Start on the XZ plane.

Workplane.Yz()

static Workplane Yz()

Start on the YZ plane.

Workplane.On()

static Workplane On(double[] frame)

Start on any frame (see Frames).

Workplane.FromSolid()

static Workplane FromSolid(Solid solid)

Start from an existing solid, on the XY plane — the usual way to pick one of its faces and build on it.

Workplane.Frame

double[] Frame

The current frame, 12 numbers.

Workplane.Cuboid()

Workplane Cuboid(double x, double y, double z)

A box on the current frame; replaces the solid.

Workplane.Cylinder()

Workplane Cylinder(double r, double h)

A cylinder of radius r and height h standing on the current frame; replaces the solid.

Workplane.Face()

Workplane Face(Profile profile)

The planar sheet the profile bounds on this frame — see Solid.Face(); replaces the solid.

Workplane.Extrude()

Workplane Extrude(Profile profile, double height)

The profile extruded height along the frame's z; replaces the solid.

Workplane.Revolve()

Workplane Revolve(Profile profile, double angle)

The profile revolved angle radians about the frame's y axis; replaces the solid.

Workplane.Translate()

Workplane Translate(double dx, double dy, double dz)

Slide the current solid. Keeps the face selection — a rigid move keeps every face's index.

Workplane.Faces()

Workplane Faces(Selector selector)

Pick a face of the current solid with a Selector.

Workplane.OnFace()

Workplane OnFace()

Move the frame onto the face last picked (outward normal as z), so the next step builds on it.

Workplane.Solid()

Solid Solid()

The solid built so far. On an empty chain it throws BuildException.

Selector.Max()

static Selector Max(Axis axis)

The face furthest along axis.

Selector.Min()

static Selector Min(Axis axis)

The face furthest against axis.

Selector.Normal()

static Selector Normal((double X, double Y, double Z) direction)

The face whose outward normal is nearest direction (need not be unit).

Selector.Index()

static Selector Index(int i)

The face with this index.

Axis

enum Axis
X
Y
Z

X, Y, Z: the axes Selector.Max() and Selector.Min() take.

Solid.Cuboid()

static Solid Cuboid(double x, double y, double z)

A box x × y × z, centred on the origin.

Solid.Cylinder()

static Solid Cylinder(double r, double h)

A cylinder of radius r, from z = 0 to h.

Solid.Cone()

static Solid Cone(double r, double h)

A cone of base radius r and height h, apex up.

Solid.Sphere()

static Solid Sphere(double r)

A sphere of radius r about the origin.

Solid.Torus()

static Solid Torus(double major, double minor)

A torus about the z axis: major to the tube's centre, minor the tube's radius.

Solid.Wedge()

static Solid Wedge(double x, double y, double z, double topX)

A box whose top face is top_x long instead of x: a ramp.

Solid.Extrude()

static Solid Extrude(Profile profile, double[] frame, double height)

The profile on frame, extruded height along the frame's z.

Solid.ExtrudeOpen()

static Solid ExtrudeOpen(Profile profile, double[] frame, double height)

The walls only, no caps: an open sheet. Takes an open Path.EndOpen() chain as well as a closed profile.

Solid.ExtrudeTapered()

static Solid ExtrudeTapered(Profile profile, double[] frame, double height, double taper)

Extrude with a draft: the walls lean out by taper radians as they rise (in, when negative). Every wall stays exact — a plane off a line, a cone off an arc.

Solid.ExtrudeOpenTapered()

static Solid ExtrudeOpenTapered(Profile profile, double[] frame, double height, double taper)

The tapered walls without caps.

Solid.ExtrudeBetween()

static Solid ExtrudeBetween(Profile profile, double[] frame, Slant bottom, Slant top)

Extrude between two planes rather than two heights: bottom and top are each a Slant (a bare number is a flat one). With both flat this is Solid.Extrude(); with a slope it is the mitred end of a frame member. A top that comes down to or through the bottom throws BuildException.

Solid.ExtrudeOpenBetween()

static Solid ExtrudeOpenBetween(Profile profile, double[] frame, Slant bottom, Slant top)

Solid.ExtrudeBetween() without the caps.

Solid.Revolve()

static Solid Revolve(Profile profile, double[] axis, double angle)

The profile swung angle radians about axis (a point and a direction — see Frames). The profile's x is read as the radius and its y as the height along the axis, so it must lie to one side of it.

Solid.RevolveOpen()

static Solid RevolveOpen(Profile profile, double[] axis, double angle)

The revolved surface of an open profile: a sheet.

Solid.RevolveInPlane()

static Solid RevolveInPlane(Profile profile, double[] frame, (double X, double Y) a, (double X, double Y) b, double angle)

The profile on frame swung angle radians about the axis through the sketch points a and b (each (x, y) on the frame) — the profile and its axis drawn together, as a sketch draws them, where Solid.Revolve() reads the profile as (radius, height). The profile may lie on either side of the axis and touch it (a half-disc with its diameter on the axis turns into a ball), but not cross it. The sweep starts where the profile is drawn and turns right-handed about b - a, so a partial turn leaves one end of the solid over the profile itself.

Solid.RevolveOpenInPlane()

static Solid RevolveOpenInPlane(Profile profile, double[] frame, (double X, double Y) a, (double X, double Y) b, double angle)

Solid.RevolveInPlane() for a curve: its segments swung into a sheet, no caps.

Solid.Coil()

static Solid Coil(Profile profile, double[] axis, double pitch, double turns)

The profile coiled about axis (a point and a direction): read as Solid.Revolve() reads it — x the distance from the axis, y along it — and turned turns times while climbing pitch along the axis each turn: a spring, a thread, Fusion's Coil. The walls follow the helix to a few millionths of the radius (a helix is not a NURBS curve, so they are a close fit, exact at both ends); the two ends are the profile itself, flat. A profile reaching the axis, one with holes, or — from a full turn up — a pitch no taller than the profile throws BuildException.

Solid.Loft()

static Solid Loft(Profile a, double[] frameA, Profile b, double[] frameB)

The solid between profile a on one frame and b on another: ruled walls between matching sides (both profiles need the same number of sides, and no holes), capped by the two.

Solid.LoftOpen()

static Solid LoftOpen(Profile a, double[] frameA, Profile b, double[] frameB)

The ruled walls without the caps.

Solid.LoftThrough()

static Solid LoftThrough(IEnumerable<(Profile Profile, double[] Frame)> sections)

The solid smooth through every section — a profile on its frame, in order: each wall interpolates its side across all the profiles (cubic through four or more, quadratic through three, Solid.Loft() through two), capped by the first and the last. Every section of the result is its profile exactly, arcs and all. The profiles must have the same number of sides and no holes; otherwise throws BuildException.

Solid.LoftThroughOpen()

static Solid LoftThroughOpen(IEnumerable<(Profile Profile, double[] Frame)> sections)

The walls through the curves without the caps: an open sheet.

Solid.Sweep()

static Solid Sweep(Profile profile, double[] frame, SweepPath path)

The profile on frame, carried along a SweepPath. A straight piece is an extrusion and an arc a revolution about the arc's axis, so nothing is approximated — a circle along an arc is an exact torus wall.

Solid.SweepOpen()

static Solid SweepOpen(Profile profile, double[] frame, SweepPath path)

The swept walls without caps: an open sheet.

Solid.Pipe()

static Solid Pipe(SweepPath path, double radius, double thickness = 0.0)

A circle of radius carried along a SweepPath, square to where it starts — Fusion's Pipe: a solid rod, or with a positive thickness a tube whose walls are that thick. The path is only borrowed, as by Solid.Sweep(), and refused the same way.

Solid.ExtrudeFaces()

Solid ExtrudeFaces(double height)

Every face of a sheet pushed height along its own normal, walled and closed: the sheet as a solid of that thickness.

Solid.Face()

static Solid Face(Profile profile, double[] frame)

The flat sheet a profile bounds on frame: one planar face, each hole a hole through it, its normal the frame's z however the profile winds, every edge the exact line, arc or spline its segment is. An open sheet — raise it with Solid.ExtrudeFaces(), cut it with Solid.Trim().

Solid.Place()

Solid Place(double[] frame)

A solid built about the origin moved onto frame: its origin to the frame's origin, its axes to the frame's (see Frames).

Solid.Translate()

Solid Translate(double dx, double dy, double dz)

Moved by (dx, dy, dz).

Solid.Rotate()

Solid Rotate(double[] axis, double radians)

Turned radians about axis (a point and a direction).

Solid.Mirror()

Solid Mirror(double[] plane)

Reflected across plane: a frame whose z is the mirror plane's normal.

Solid.Join()

Solid Join(Solid other, double tolerance = 0.05, bool merge = false)

The union with other, as an exact B-rep. merge (off by default, so face and edge numbers stay as they were) merges the flush faces the join leaves, as Solid.MergeFlush() does — Go takes it as a trailing true, Java as an overload; Solid.Cut() and Solid.Common() take it too. tolerance (0.05 by default) is the mesh tolerance the boolean decides at: both solids are meshed at it, so a tighter one is as correct and slower. progress, where the wrapper takes one, is called with a phase name and a done/total count.

Solid.Cut()

Solid Cut(Solid other, double tolerance = 0.05, bool merge = false)

This solid with other removed.

Solid.Common()

Solid Common(Solid other, double tolerance = 0.05, bool merge = false)

What this solid and other share.

Solid.SplitSheet()

Solid SplitSheet(Solid tool, double tolerance = 0.05)

This solid or sheet cut along tool's boundary with nothing removed: each face comes back as its pieces outside tool and then its pieces inside, in the original face order — the start of a surface trim. tool must be a closed solid. Keep the pieces you want with Solid.DropFaces(), or split and drop in one call with Solid.Trim().

Solid.FaceSheet()

Solid FaceSheet(int face)

One face alone, as an open sheet: its surface, its loops and the exact curves on its edges, the rest of the solid left behind — raised by Solid.ExtrudeFaces() it is the prism over that face. Keeps the face's colour.

Solid.DropFaces()

Solid DropFaces(IEnumerable<int> faces)

This solid without the faces listed: the rest keep their surfaces, curves and colours in their order, so an index into the result is this one's with the dropped ones closed up. Dropping every face throws BuildException.

Solid.Trim()

Solid Trim(Solid tool, string keep = "outside", double tolerance = 0.05)

This sheet (or solid) cut along the closed tool's boundary and the pieces on one side thrown away: keep "outside" (the default) keeps what lies outside the tool — a hole punched through — and "inside" what lies within it. Nothing on the kept side throws BuildException. tolerance and progress as for Solid.Join().

Solid.PushPull()

Solid PushPull(int face, double distance, double tolerance = 0.05)
Solid PushPull(IEnumerable<int> faces, double distance, double tolerance = 0.05)

Face face pushed out by distance along its outward normal — pulled in, negative — the way Fusion and Rhino extrude a face: the prism over it joined on (cut out) at tolerance, and the flush faces merged, so a box's top raised is one taller box of six faces rather than a box and a prism with every side wall split at the seam. A face on a cylinder, a cone, a sphere or a torus moves out along its normal instead, as Fusion's press-pull does: the surface a step out — a boss fatter, a bore or a countersink narrower, a dome fuller — with the flat faces beside it carried along in their own planes. Any other curved face is refused, as is a curved face with anything but a plane it can follow beside it, reaching a cone's apex, pushed to its axis or centre, off a plane beside it or run into another edge. A flat face keeps its own colour where it now lies.

Several faces push together, as Fusion's press-pull on a selection: each by its own rule, one after another in the order given, each found again after the pushes before it renumbered the faces — a box's top and a side pushed 5 is the box 5 taller and 5 wider, a boss's top and wall the boss taller and fatter. A face on the same curved surface as one before it, and joined to it, moved with that one and is not pushed twice. No faces, or a face an earlier push took away, throws BuildException.

Solid.Refillet()

Solid Refillet(int face, double radius, double tolerance = 1e-6)

The round face belongs to — a fillet's bands, balls and rim bands joined to that face — made again at radius, as Fusion's press-pull on a fillet face: taken back to the sharp edges it replaced, and those rounded again, so the round is the one Solid.Fillet() makes at that radius. Rounds of straight edges between planes (their ends square corners, mitres, balls, or a cylinder, cone or sphere the edge runs into — a D-cut shaft's top edge, a rib's into a boss) and of circular rims between a plane and a cylinder or cone (a boss's foot, a bore's mouth, a counterbore's step); a face that is not one, or a radius that does not fit, throws BuildException.

Solid.Unfillet()

Solid Unfillet(int face)

The round face belongs to taken off, the faces beside it made sharp again, meeting on the edges the round replaced — Fusion's delete of a fillet face. The same rounds as Solid.Refillet().

Solid.Rechamfer()

Solid Rechamfer(int face, double distance, double tolerance = 1e-6)

The chamfer face belongs to — its bevels (flat between two planes, cones round rims) and the corner triangles joined to that face — cut again at distance, as Fusion's press-pull on a chamfer face: taken back to the sharp edges it cut, and those bevelled again, so the chamfer is the one Solid.Chamfer() cuts at that distance. A flat bevel's ends may run into a cylinder, cone or sphere, as a round's may. A face that is not a chamfer's bevel, or a distance that does not fit, throws BuildException.

Solid.Unchamfer()

Solid Unchamfer(int face)

The chamfer face belongs to taken off, the faces beside it made sharp again — Fusion's delete of a chamfer face. The same chamfers as Solid.Rechamfer().

Solid.MergeFlush()

Solid MergeFlush()

This solid with its flush faces merged: flat faces on one plane, facing one way and meeting along their edges — the seams Solid.Join() leaves where two parts are flush — made one face, and the vertices left mid-way along a straight edge taken out.

Solid.Split()

IReadOnlyList<Solid> Split(Solid tool, double tolerance = 0.05)

This solid split by tool into bodies — Fusion's Split Body — returned as a list: a closed tool gives the parts outside it, then the parts inside; a flat sheet (a Solid.Face()) splits by the whole plane it lies on. Each connected part is a body of its own, so a U cut across both arms is three. The new faces are pieces of the tool's, the colours carried over. A tool that does not cross the solid, or a curved sheet, throws BuildException. tolerance and progress as for Solid.Join().

Solid.SplitByPlane()

IReadOnlyList<Solid> SplitByPlane(double[] plane, double tolerance = 0.05)

This solid split by the plane through plane's origin, square to its z (a frame): the bodies in front of it first, then those behind.

Solid.Lumps()

IReadOnlyList<Solid> Lumps()

This solid's connected bodies, each a solid of its own — faces sharing an edge are one body — in the order of their first faces. One body comes back as itself; a boolean that leaves two parts gives two.

Solid.Edges

unsafe IReadOnlyList<Edge> Edges

The solid's edges as Edge values — what Solid.Fillet() and Solid.Chamfer() take. Copied; safe to keep.

Solid.Fillet()

Solid Fillet(IEnumerable<Edge> edges, double radius, double tolerance = 1e-6)
Solid Fillet(IEnumerable<int> edges, double radius, double tolerance = 1e-6)

Round the given edges (Edge values or their indices) with radius. Exact: the blend faces are cylinders, tori and NURBS, and the neighbours are trimmed back onto them.

Solid.Chamfer()

Solid Chamfer(IEnumerable<Edge> edges, double distance, double tolerance = 1e-6)
Solid Chamfer(IEnumerable<int> edges, double distance, double tolerance = 1e-6)

A flat bevel instead of a round: each edge cut back distance along both its faces.

Solid.Shell()

Solid Shell(double thickness, IEnumerable<int>? open = null, double tolerance = 1e-6)

Hollow the solid to walls thickness thick — inward for a positive thickness, outward (the solid becoming the cavity) for a negative one. The faces listed in open are removed so the hollow is reachable.

Solid.Thicken()

Solid Thicken(double thickness, double tolerance = 1e-6)

A sheet made a solid thickness thick — Fusion's Thicken: its faces, their twins moved thickness along the faces' normals (against them for a negative thickness), and a wall round every open edge. Two faces of a folded sheet meet on their offsets' mitre; a closed sheet thickens to a hollow. Free-form (NURBS) faces offset by a fit held to tolerance. A thickness a face cannot take — a radius used up, a free-form offset folding over — throws BuildException.

Solid.Faces

int Faces

How many faces.

Solid.FaceKind()

string FaceKind(int face)

A face's surface: plane, cylinder, cone, sphere, torus, nurbs, revolution, extrusion or other.

Solid.SelectFace()

int SelectFace(Selector selector)

The index of the face a Selector picks.

Solid.FaceFrame()

double[] FaceFrame(int face)

The frame on a face: origin at its centre, z its outward normal, x world X laid onto the face (world Y on a face facing close to X) — Frame.At()'s rule, so the top of a box gets the XY plane's axes. What Workplane.OnFace() moves onto.

Solid.Bounds

(double[] Min, double[] Max) Bounds

The axis-aligned bounds, over the tessellation at 0.05.

Solid.BoundsAt()

(double[] Min, double[] Max) BoundsAt(double tolerance)

The bounds over the tessellation at tolerance — the same cache Solid.Mesh() fills, so asking both costs one mesh.

Solid.LeakedEdges()

int LeakedEdges(double tolerance = 0.05)

How many mesh edges at tolerance are bound by anything other than two triangles: zero for a closed solid. A seam two solids share along a line does not count; a hole or a fold does.

Solid.UnpairedEdges()

int UnpairedEdges(double tolerance = 0.05)

How many mesh edges have triangle uses that do not cancel out: zero for a closed, consistently oriented solid. Unlike Solid.LeakedEdges() this catches a fold — two triangles running the same way.

Solid.IsWatertight()

bool IsWatertight(double tolerance = 0.05)

Whether Solid.LeakedEdges() is zero.

Solid.Manifold

Manifold Manifold

Whether the faces make a manifold — every edge bordered by one face or two, the faces round every vertex one fan — and whether it is closed, as a Manifold. Read off the solid's topology, not a mesh, so it takes no tolerance; whether the faces all face out is Solid.UnpairedEdges()'s question.

Solid.Coloured()

Solid Coloured(double r, double g, double b, int? face = null)

A new solid coloured (r, g, b), each 0..1 — Python and Node.js also take "#rgb" or "#rrggbb" — or, given a face (Go: ColouredFace), just that face, whose colour then wins over the solid's. What is made from a coloured solid inherits: a move keeps every colour; a boolean, fillet, chamfer or shell gives each face the colour of the input face it lies on (a cut's bore takes the tool's), and a new face — a round, a shell's inner wall — the solid's. STEP output carries no colour.

Solid.Colour

double[]? Colour

The solid's own colour as (r, g, b), or none.

Solid.FaceColour()

double[]? FaceColour(int face)

A face's colour as drawn: its own, else the solid's, else none.

Solid.Open()

static Solid Open(string path, int? body = null)

The body a CAD file holds, as a solid: STEP (AP203/214/242), ACIS .sat, Rhino .3dm, OCCT .brep, IGES or IFC, read where it draws, in the file's own units and axes. A file drawing several bodies needs body (0-based, in drawing order) or Solid.OpenAll(). What such a solid can do is what its geometry allows: fillet and chamfer want line and circle edges; booleans take any surface, but new edges traced on a free-form face are not always writable back to STEP; and every verb meshes its operands first, so its cost grows with the body's face count. Reads through the reader library, which must be from the same release.

Solid.OpenAll()

static IReadOnlyList<Solid> OpenAll(string path)

Every body a CAD file draws, as solids placed where it draws them: one per placement, so a part placed twice is two solids.

Solid.FromNode()

static Solid FromNode(Scene scene, Node node, bool placed = true)
static Solid FromNode(Scene scene, uint node, bool placed = true)

The body a reader Node draws, as a solid — sharing the reader's brep (Node.Brep), not copying it; the scene can be closed first. placed (the default) puts it where the node's transform does, where its mesh draws; otherwise it keeps the node's own frame. The two libraries' layouts (Blacksmith.BrepLayoutId()) must agree, or it throws CadaclysmException.

Solid.Mesh()

BlacksmithMesh Mesh(double tolerance = 0.05)

Triangles at tolerance: positions, normals (three floats a vertex) and indices. Views into the solid's own cache — valid until the solid is closed or meshed again at a different tolerance; copy what must outlive either.

Solid.FaceTriangles

How many triangles each face meshed to at tolerance, one count per face in face order: the triangles of Solid.Mesh() at the same tolerance run face by face, so face f's are the counts[f] after the first counts[:f].sum(), and the counts sum to the mesh's triangle count. What a viewer colours a face by. A view, like Solid.Mesh().

Declared (cadaclysm_blacksmith_mesh_face_triangles); the method comes with the viewers.

Solid.EdgePolylines()

BlacksmithPolylines EdgePolylines(double tolerance = 0.05)

The feature edges as polylines at tolerance, one run of points per edge. Views, like Solid.Mesh().

Solid.Show

Draw the solid with the viewer in use — in a terminal, the picture is left in the scrollback. Each face keeps its own colour (Solid.FaceColour(): a colour of its own, else the solid's). Keywords: view= (front, back, left, right, top, bottom, iso), az=, el=, zoom=, up=, edges=, width=, height=, hint=, tolerance=.

Comes with the viewers follow-up.

Solid.View

Orbit the solid with the viewer in use until it is closed; returns (azimuth, elevation, zoom) where it was left. Keywords as Solid.Show.

Comes with the viewers follow-up.

Solid.Step()

void Step(string path, string? schema = null, string unit = "mm")

Write this solid as an AP203 STEP file; see Blacksmith.WriteStep() for schema and unit.

Solid.StepText()

string StepText(string? schema = null, string unit = "mm")

The same STEP file as text.

Solid.ToScene()

Scene ToScene(string? schema = null)

This solid as a reader Scene, through STEP in memory: the door from the kernel to everything the reader does — its tree, meshes, glTF/OBJ/STL export. Needs the reader library as well.

Solid.Dispose()

void Dispose()

Free the solid now. The garbage collector, or the language's scope, does it otherwise.

Edge.Index

int Index

Its index — what Solid.Fillet() and Solid.Chamfer() take.

Edge.Kind

string Kind

The curve: line, circle, ellipse, nurbs or other.

Edge.Faces

int[] Faces

The faces meeting on it, as face indices.

Edge.Segments

(double[] A, double[] B)[] Segments

The two ends of each piece of the edge.

Edge.IsLine

bool IsLine

Whether the edge is straight.

Edge.Direction

double[]? Direction

The unit direction of a straight edge, or null for a curved one. Picking the vertical edges of a plate is a filter on this.

Manifold.Faces

How many faces.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.Edges

How many distinct edges: one shared by two faces counts once.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.Vertices

How many distinct vertices.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.BoundaryEdges

Edges only one face borders: a sheet's rim, a hole in a shell.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.NonManifoldEdges

Edges three or more faces border: a fin, or two solids meeting along a line.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.NonManifoldVertices

Vertices whose faces make more than one fan: two solids touching at a corner.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.IsManifold

No non-manifold edge or vertex: a manifold, possibly with a boundary.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.

Manifold.IsClosed

A manifold with no boundary edge either: it encloses a solid.

Solid.Manifold returns the reader's Cadaclysm.Manifold, the same record.