Module offset_surface 

Offset surface generation and signed distance field (SDF) operations.

Provides SDF primitives, CSG operations, mesh offsetting, and voxel SDF grids.

Structs

OffsetMesh

A triangle mesh with per-vertex normals, supporting inward/outward offsetting.

SdfBox

Axis-aligned box SDF (exact).

SdfCapsule

Capsule (line-segment rounded) SDF (exact).

SdfCone

Cone SDF: tip at apex, opening downward along -Y, with half-angle angle_rad.

SdfCylinder

Cylinder SDF aligned with the Y axis (exact).

SdfDifference

Boolean difference: A minus B (max(da, -db)).

SdfIntersection

Boolean intersection (max).

SdfOffset

Offset (shell expansion / shrinkage): d(p) - offset.

SdfPlane

Half-space plane SDF: n·p - offset (exact). normal should be unit length.

SdfScaled

Uniformly scale an SDF (scale > 1 makes the shape larger).

SdfSmoothIntersection

Polynomial smooth intersection with blending radius k.

SdfSmoothUnion

Polynomial smooth union with blending radius k.

SdfSphere

Sphere SDF (exact).

SdfTorus

Torus SDF lying in the XZ plane, centred at center (exact).

SdfTranslated

Translate an SDF by a fixed offset.

SdfUnion

Boolean union (min).

VoxelSdf

Discretised signed distance field on a regular axis-aligned grid.

Traits

Sdf

Signed distance function: negative inside the shape, positive outside.

Functions

approximate_medial_axis

Approximate medial axis computation using a voxel SDF.

detect_edge_features

Detect feature edges in a triangle mesh, classifying interior edges as convex (dihedral angle < π) or concave (dihedral angle > π).

extract_zero_crossings_slice

A simple marching-squares (2-D) contour extractor for a 2-D slice of a VoxelSdf.

generate_shell

Generate a solid “shell” mesh from a surface mesh.

inward_offset

Compute an inward-offset (shrunk) mesh.

offset_curve_3d

Offset a 3D polyline by d along a fixed normal direction.

offset_polyhedron

Offset a closed polyhedron mesh outward (or inward for negative d).

outward_offset

Compute an outward-offset mesh from a triangle soup.

variable_offset

Apply a different offset distance to each vertex along its averaged normal.