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Old 30th June 2007, 09:26 AM   #1
Terry Capps
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Question Location of the Normal on a Complex Surface?

At first, I thought that the location of the Normal of a surface was at the Center of Mass of the surface, and it is for a simple triangle, but when I created a surface that consisted of two adjacent triangles, combined, I found that the Normal was not at the center of the combined surface.

Can anyone tell me how to calculate the location of the Normal? I saw Andy's reply to someone's request for the code for determining the Normal, but I'm not familiar with the C language or whatever it is written in. I would appreciate it if someone could tell me how to locate the location of the Normal in mathematical terms.

I have found it useful for controlling the Extrusion of a complex shape along a curved path. See the attached images for the thread called "Extrude along path with Non-Symmetrical surface?", Post #5.

Last edited by Terry Capps; 30th June 2007 at 10:35 AM.
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Old 2nd July 2007, 08:14 AM   #2
Terry Capps
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Talking Re: Location of the Normal on a Complex Surface?

Nevermind. I have figured it out, with a little help from Andy about what the Center of Gravity in ac3d really means.
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