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I need to convert a xml file into a .ply format. I started with a catproduct and I want to project that catproduct using a Virtek laser. In order to do so, I need a .ply and .cal files. How can I do that?

Here is my section of code that I need help on. The error VisualLISP is giving me is :Function Canceled. The builder doesn't complain, so my syntax is correct, but its just not working. I am making simple lines and changing the color to them using the "change" command with a function call. Can anyone please tell me what I am doing wrong?? Also just fyi in defun c:wellplace.. i just used the line (color po2) because i don't want to post the whole code in, everything else works fine, but breaks when it gets to that line. (defun color (col) (command "change" col "" "P" "C" "T" "255,0,0" "") ) (defun c:wellplace () (color po2) ;po2 is a "point number 2" that is calculated else in the code. ) Shouldn't it take the po2 which is a polar point, consisting of x,y,z coordinates and pass it along to the "color function"? I am doing this, because I need to do the "change" command a good 8 times, and i don't want 8 of duplicate lines of the same thing. Also if i go with not defining a function and just inputting the "change" command right into the body of my code, it works perfect, and replace 'col' with 'po2' so what gives?