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Subject: line intersecting point in 3d



Hi,
I've read about the basics of vectors, but I still don't know
how to find out if a line intersects a point in 3d space.

If I have a ray starting at origin O, and travelling
with vector V, how do I know if it hits point P?

That is:

Ray = O + Vt
Point = P

Can someone please tell me how to calculate this?
Thanks

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