WebGPU Path Tracing

Path tracing is a realistic lighting algorithm that simulates light bouncing around a scene. This path tracer uses WebGPU for realtime performance and supports diffuse, mirrored, and glossy surfaces. The path tracer is continually rendering, so the scene will start off grainy and become smoother over time. Here's how to interact with it:

Add an object using the "Add Sphere" or "Add Cube" buttons
Select an object by clicking on it
Move the selection along the face of its selection box by dragging around on that face
Delete the selection using the backspace key
Rotate the camera by dragging the background

Computation mode:

Material:
with glossiness factor: 0 < < 1
Environment:

Load preset scene:

Select or add objects:

The entire scene is dynamically compiled into a WGSL shader. Fragment shader and compute shader are both supported. Everything can be repositioned using the current shader, but any geometry or material change means a recompilation. To calculate a pixel color, a ray is shot into the scene and allowed to bounce around five times. At each bounce, the direct light incoming at that point (including shadows) is multiplied by all previous material colors and accumulated. Soft shadows are achieved by randomly jittering the light position per-pixel.