The BRDF, or Bidirectional Reflective Distribution Function is a function that takes as input the incoming (light) direction $\omega_i$, the outgoing

OverviewPhysically based rendering strongly follows a more specialized version of the render equation known as the reflectance equation, which is the

OverviewPBR (Physically Base Rendering) is a rendering technique that are more or less based on the same underlying theory which more closely matches

Generate RayGenerate a ray that goes from the camera’s origin through the pixel location (pixelPosX, pixelPosY) of the camera. Note that pixelPosX and

LightingCaculate lighting effect is extremely complicated and it depends on way too many factors in real world, therefore we use a method based on app

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