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U, V Parameters of a Point on a Surface Example

This example demonstrates the use of the SPARF function to return the U and V parameters on a surface at a position closest to PT1.

   ENTITY/SURF1,PT1
   .
   .
   .
   SPARF/SURF1,PT1,UPARAM,VPARAM

The function above is equivalent to the following where the X, Y and Z values are used instead of the object PT1.

   SPARF/SURF1,X,Y,Z,UPARAM,VPARAM

The variables UPARAM and VPARAM, can now be used as input to the surface position function, SPOSF, or the surface normal function, SNORF.