Normally a matrix can transform
an object so the point x can become
P1, y can become P2, z can become
P3 and the origin becomes P4.
How can I do this thing backwards?
I.e. P1 becomes x, P2 becomes y,
P3 becomes z, and P4 becomes the
origin. The way I tried it I only
got a lot of divide by zero warnings.

Thanks,

Rune S. Johansen
http://hjem.get2net.dk/rsj

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