Derivatives Summary

• X, Y

  • dx/dy

• Z (depth)

  • dz/dx, dz/dy, dz/dscan

• R,G,B, A (Gouraud Shading, GL_SMOOTH)

  • dr/dx,dr/dy, dg/dx,dg/dy, db/dx,db/dy, da/dx,da/dy
  • dr/dscan, dg/dscan, db/dscan, da/dscan

• S,T (Texture coordinates)

  • ds/dx,ds/dy, ds/dscan, dt/dx,dt/dy, dt/dscan

• Each time Y is incremented, we increment by appropriate d?/dscan . Each time X is incremented, we increment by appropriate d?/dx.

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