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I'm having a pretty big problem intersecting parametric lines. I'm using the equations:

x = x1 + t(x2 - x1)

y = y1 + t(y2 - y1)

Given the 2 lines:

x = x1 + t(x2 - x1)

y = y1 + t(y2 - y1)

x = x3 + t(x4 - x3)

y = y3 + t(y4 - y3)

I calculate the intersection, using this:

t = ( x3 - x1 ) / ( (x2 - x1) - (x4 - x3) )

And then I would plug it into the first line...

For some odd reason...it doesn't work! And the funny thing is, that it used to work in my program. I'm not sure if I made any changes, but it's really screwing things up...

Please help!

P.

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# Parametric Line intersections

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