Module ray_marching 

Ray marching and Signed Distance Field (SDF) rendering utilities.

Provides a CPU-side implementation of common ray marching primitives: SDFs for spheres, boxes, capsules, and tori; boolean CSG operators; smooth blending; ambient occlusion; soft shadows; and a simple renderer that produces depth and normal buffers.

Structs

AmbientOcclusion

Ambient occlusion estimator using SDF step-based sampling.

BoxSdf

SDF for an axis-aligned box centred at the origin.

CapsuleSdf

SDF for a capsule (cylinder with hemispherical caps).

Ray

A ray defined by an origin point and a (normalized) direction vector.

RayMarchRenderer

A simple camera/renderer that generates rays and produces image buffers via ray marching.

RayMarchResult

Result of a single ray march step.

SoftShadow

Penumbra-aware soft shadow estimator.

SphereSdf

SDF for a sphere.

TorusSdf

SDF for a torus lying in the XZ plane, centred at the origin.

Traits

Sdf

A Signed Distance Field: maps a 3-D point to the signed distance to the nearest surface (negative inside, positive outside).

Functions

ray_march

Perform sphere-marching along ray against the provided SDF.

sdf_intersection

SDF intersection: take the maximum of two distances.

sdf_smooth_union

Polynomial smooth union of two SDF values with blend radius k.

sdf_subtraction

SDF subtraction: subtract shape B from shape A.

sdf_union

SDF union: take the minimum of two distances.

subsurface_scattering_approx

Approximate subsurface scattering transmittance.