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Polygon Normal help

Started by Riviera Kid Jun 4, 2004 at 2:37 PM 0 replies 250+ views

Original Post

113

Jun 4, 2004 at 2:37 PM

Hi. In my 3d program i have polygons made from 3 points to form a triangle. These points have no angles. How do i get the normal for these polygons. Im confused by the tutorials.

markr

159

markr

Jun 4, 2004 at 4:24 PM

Take the first two sides of the triangle as vectors, for example, if the triangle looks like ABC clockwise from the outside of the object, take two vectors A -> B and B -> C, and find the cross product of them.

This will be a normal - depending on what you want to use it for you may have to normalise it.

Mark

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