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[Pixi] DisplacementFilter vs NormalMapFilter


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I'm not sure about the exact differences in pixi's implementation (I haven't used filters yet), but displacement effects simulate refraction (like how things look distorted when looked at through water) while normal maps simulate "bumps" in a surface's texture in order to make it look more realistic.

Looking at pixi's source code, it seems that NormalMapFilter is also a displacement map filter, but which also takes a light position as a parameter and performs bump mapping based on that light position.

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