Brigade uses path tracing, which is an extension to the ray tracing algorithm capable of producing photorealistic images. It traces many rays (samples) per pixel in random directions, and then takes the average value to calculate the final color of each pixel.

Whenever a ray hits a surface, a new ray is traced from that hitpoint in a random direction until the max path depth is reached or until a Russian roulette-like mechanism kills the ray.
This way, path tracing is able to produce effects like diffuse color bleeding, glossy (blurry) reflections, true ambient occlusion, soft shadows, caustics, true depth of field, etc.


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