Module gpu_sdf 

GPU-accelerated Signed Distance Field (SDF) computation (CPU mock).

This module provides:

• Primitive SDF shapes (SdfPrimitive)
• CSG boolean operations (SdfOp)
• A tree-based SDF scene (SdfNode)
• A volumetric grid (SdfGrid) that can be filled from any SDF function
• A mock GPU dispatcher (GpuSdfCompute) that evaluates primitives over a grid
• Free-standing SDF evaluation helpers

Structs

GpuSdfCompute

Mock GPU dispatcher for SDF field computation.

SdfGrid

A regular 3-D grid that stores SDF values as f32.

Enums

SdfNode

A node in a CSG (Constructive Solid Geometry) SDF tree.

SdfOp

Boolean / blending operations that combine two SDF values.

SdfPrimitive

A primitive signed distance field shape.

Functions

sdf_box

Signed distance from point p to an axis-aligned box centred at center with half-extents b.

sdf_cylinder

Signed distance from point p to a finite cylinder (Y-axis aligned) centred at center with radius radius and total height height.

sdf_gradient

Estimate the surface normal at p using central differences on sdf.

sdf_smooth_union

Polynomial smooth-minimum of d1 and d2 with blend radius k.

sdf_sphere

Signed distance from point p to a sphere at center with radius r.

sdf_torus

Signed distance from point p to a torus (Y-axis aligned) centred at center with major radius r_major and minor radius r_minor.