zraytrace

Ray tracing implemented in Zig.

Inspiration

Code follows mostly Ray Tracing in One Weekend and Physically Based Rendering.

Features

Single threaded, uses only on CPU.

Materials:

• diffuse (matte)
• metal (fully reflective)
• dielectric (glass like objects)

Shapes

• sphere
• triangle

Textures:

• constant color
• image textures

Algorithms

• Bounded volume hierarchy

File formats:

• PNG images, read and write
• OBJ 3d models, read

Examples

Spheres

This doesn't use bounded volume hierarchy because its overhead is too big for scene with 7 spheres.

From the left:

• reflective texture mapped sphere (earth)
• hollow dielectric sphere (glass)
• diffuse texture mapped sphere (Nitor logo)
• filled dielectric sphere (glass)
• reflective sphere with silver color (mirror ball)
• diffuse green sphere (ground level)

Some statistics

• Surfaces: 7
• Pixels: 1000x1000
• Samples per pixel: 1000
• Max recursion depth: 30
• Total reflections: 1144753226
• Total background hits: 999892115
• Total pixels: 1000000
• Total samples: 1000000000
• Total rays: 2144645362
• Total reflections: 1144753226
• Pixels per second: 1619.68 pixels/s
• Total runtime: 617.41 seconds