understanding normals....

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If I have a verticy that is 5,0,0 should my unitized normal for that verticy be 6,0,0 or 1,0,0. I know that normals should have a length of 1. But does that length of 1 originate from 0,0,0 or the end of the verticy? Thanks, Devin

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A normal is a unit vector, which represents a direction. It doesn't really have a correlation to the origin at all - it should be (1,0,0).

When you think of a normal, you can think of the vertex to which the normal belongs as the origin for that normal. Its better IMO just to treat normals as a direction though.

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You may have just solved my lighting problem :) Thanks.

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a vertex normal is the average vector of all the face normals that touch this vertex

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Rutin
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