When should normal maps be used instead of adding more geometry?

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When should normal maps be used instead of adding more geometry?

Asked on Nov 07, 2025

Answer

Normal maps are used to simulate surface detail without increasing polygon count, making them ideal for adding fine details like bumps or grooves to a model while maintaining performance. They are particularly useful in real-time applications such as games, where rendering efficiency is crucial.

Example Concept: Normal maps are texture maps that store surface normals, allowing the illusion of complex detail on a low-poly model. By altering how light interacts with the surface, they create the appearance of depth and texture without additional geometry, optimizing performance while maintaining visual quality.

Additional Comment:

Normal maps are best used for small details that do not affect the silhouette of the model.
They are commonly generated from high-poly models and applied to low-poly versions.
Consider using normal maps in conjunction with other maps like diffuse and specular for enhanced realism.

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