Back in the days when it was easy to write interactive applications, I 
made a demonstration (as a Hypercard stack, and in Macintosh Pascal for 
the 512K Mac) that allowed the user to click on points to make a source 
triangle, and any number of destination triangles, to create an Iterated 
Function System.  It also output the coefficients for the affine 
transformations.  This was a great way to get to understand the "collage 
theorem" (see Barnsley's "Fractals Everywhere" book, among many others.) 
  Now I suppose that if I want to do the same thing again, I'll have to 
learn JAVA.

In the meantime, using POVRay, one can manually enter the values for the 
vertices of the triangles.  If anyone wants the code, I'll post it.

Dave Matthews

(With some work, perhaps I can use the IFS below for my "sig")

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