Texture the
surface.

Bump mapping perturbs a lit surface from a height texture without changing its geometry or requiring vertex tangents. This procedural contract keeps the texture toggle, scale mutation, and shader invalidation visible.

active path

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bump scale

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tangent requirement

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sample avg / p95

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Height fixture is ready for Phong bump perturbation.

Runtime uses a procedural RGB height fixture. Official Lee Perry-Smith geometry/texture, exact page/pixel fidelity, arbitrary UV matrices, device-wide performance, context-loss stress, and whole-example fidelity remain unclaimed.

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