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Lecture 14: Material Modeling (18)

The small black noise-like patterns on the kangaroo, are they artefacts of aliasing, or reflection of the surround grids, or both?


Are the swirls caused by aliasing?


Would adding a small amount of noise in the reflection make this look more realistic? It looks too "perfect" to be a real image.


The reason this might appear "perfect" is because the surface is an nonideal reflector. In real life mirrors can be imperfect or ideal, causing it not to reflect 100% perfectly. We can model this imperfection by having the brdf change on certain parts of the material. For example, certain inputs to the brdf sample function could perhaps return different types and qualities of reflection to achieve mixed results around the mesh.

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