A diagram showing the vectors and distances used in one-step parallax mapping, relative to a surface point:
   * N, the surface normal
   * V, vector in direction of viewer
   * h, height of height map (a.k.a. bump map) at surface point
   * o, offset to surface point based on intersection of V with the surface at height h

Image originally created by User:Fuzzypeg in Inkscape and modified by User:Martin Kraus; released to the public domain.
Own work
Martin Kraus