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# What is the inside of a plane?

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A plane is defined by 3 points. Using these three points we can make a face nornmal by taking the cross product of the two vectos that join them. I already have this up and running in my lighting system. For the purposes of building a frustum, if i create a plane then want to say that a certain direction is the ''inside'' how do I do that? A frustum should have all it''s normals pointing inside. How do you make that happen? Thanks Chris

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Hello

When you calculate the two vectors you must subtract the points in the right order. If you subtract them in counter-clock-wise order then your normal vectors should point to the inside of your frustum, assuming you were inside the frustum when you determined the order.

Hope this helpes

Osku

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