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3D Ray Tracing Sandbox — Real CPU Path Tracing, Interactive
Watch a real ray tracer compute reflections, shadows and lighting live in your browser — adjustable light position, camera field of view, and material properties (roughness, reflectivity) — genuine ray-surface intersection math running on the CPU, the same fundamental technique behind offline rendering in film and game cinematics, made interactive.
How to use 3D Ray Tracing Sandbox
- Adjust light position and camera field of view.
- Change material properties on scene objects.
- Watch the scene re-render with real ray tracing.
- Try different material combinations.
Frequently asked questions
- Is this real ray tracing, or a shader approximation?
- Real ray tracing — rays are actually cast per pixel and intersected against scene geometry to compute reflections and shadows, computed on the CPU rather than approximated with a screen-space shader trick.
- Why does it run on the CPU instead of the GPU?
- CPU ray tracing is more straightforward to implement with exact intersection math and is fully portable without requiring WebGL/WebGPU support, at the cost of lower resolution or frame rate compared to GPU-accelerated ray tracing.
- What material properties can I adjust?
- Roughness, reflectivity and color are typically adjustable, letting you see how each affects how a surface interacts with light in the traced result.
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