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Lee:
Thanks for the LISP code. When I load it in to AutoCAD I get an error: "ACAD error: invalid character". I found some LISP code in the AutoLISP forum that purports to do something similar to yours, but it gave me the same error.
Perhaps this error is because I am using an ancient (R14) version. Most of my code is written in "C" and I haven't written any LISP code for many years, so I will have to try to convert your code to "C" . I already have functions for manipulating the 3DFACE's in a TIN, like calculating the X,Y,Z coordinates by picking a random point, plotting the profile of a POLYLINE path across the TIN, and calculating the volumes between TIN's. I have "C" code to calculate the face normal vector of a a given 3DFACE, so hopefully all I need is the cross product code to calculate the water drop path.
Thanks again,
Charles