If the normal map is set, will the bump map be invalidated?
If you put a normal map and a bump map respectively, a characteristic operation is performed.
However, if specified at the same time, the bump map is invalidated.
The two map types provide the same thing — how to orient the surface for lighting calculations — and so they cannot be used together. See .bumpMap docs.
Either can be combined with .displacementMap, which offsets vertices and is complementary.
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