Module surface 

Concrete surfaces.

The five analytic surfaces plus a NURBS patch, a surface of revolution, a surface of extrusion, and a trimmed restriction of any of them. All reachable through SurfaceGeometry, an enum for the same reasons curves are one: see crate::curve.

Keeping analytic surfaces analytic

A cylinder could be written as a NURBS patch. Keeping it a cylinder is worth the extra types: intersection can take a closed-form path, measurement can report a radius rather than a fit, files stay small, and a fillet knows it is filleting a cylinder. The cost is that every algorithm must handle a handful of cases, which the kind method makes an explicit choice rather than a hidden one.

Structs

BSplineSurface

A tensor-product B-spline patch, polynomial or rational.

ConeSurface

A cone, parameterized by (angle, height).

CylinderSurface

A cylinder, parameterized by (angle, height).

ExtrusionSurface

A curve swept along a direction.

OffsetSurface

A surface displaced a constant signed distance along its basis’s normal, sharing the basis’s parameterization.

PlaneSurface

A plane, parameterized by its frame’s x and y axes.

RevolutionSurface

A curve revolved about an axis.

SphereSurface

A sphere, parameterized by (longitude, latitude).

TorusSurface

A torus, parameterized by (angle about the axis, angle around the tube).

TrimmedSurface

Another surface restricted to a sub-rectangle of its domain.

Enums

SurfaceGeometry

A surface.

Constants

SURFACE_EXTENT

How far an unbounded surface’s default domain reaches.

Functions

carried

A parameter carried from one domain to another by the affine map between them: where a transform rescales a parameter, a trim inside the old domain lands at the same place inside the new. Unchanged where the old domain has no width to map from.