Ray-marches the height field in tangent space so texture features shift with view angle and occlude each other, recovering the parallax that normals alone cannot express.
supersedescorrects · extends
classifiesspecializes · part-of
substitutes forapproximates · alternative-to
depends onrequires · validates
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correctsfixes a defect in Normal Mappingperturbed normals give no parallax or self-occlusion
References
Dynamic Parallax Occlusion Mapping with Approximate Soft Shadows — Tatarchuk — 2006 · link