Texture Coordinates

• S,T coordinates must be corrected for perspective projection

  • In triangle function, vertex x, y, z are in window coordinates and have already been corrected

• Correcting for perspective projection is easy, just divide by W

  • Snew = Sold / W
  • Tnew = Told / W

• Perspective projection correction will alter how S,T are computed incrementally in triangle rasterizer

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