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## Main Question or Discussion Point

I have a 3D polygon and a ray! Please tell me how can I know if they intersect together and how to find intersection point between them?

- Thread starter silver_angel
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I have a 3D polygon and a ray! Please tell me how can I know if they intersect together and how to find intersection point between them?

HallsofIvy

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Put those equations for x, y, z, in terms of t, into the equation of the plane and solve the equation for t. If t>= 0, put it into the equations for the ray to find (x,y,z). If t<0 then the ray does not go through the plane- it goes the "away from" the plane.

(It is possible that the coefficient of t in the final equation will be 0. In that case the ray is parallel to the plane.)

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Thank you so much!

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