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Old 16-04-2007, 04:51 AM   #1
mamikapapo
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Default Four sided poly faces

Just got through the cartoon dog tutorial. First, I'd like to say it's a great tutorial, and I learned a lot.

My question... why is it important to try to keep the polygon faces to 4 sides? What's wrong with five side or three sided faces?
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Old 16-04-2007, 05:28 AM   #2
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Depending on what you do with 3d modeling, it's best to keep your geometry in quads (4-sided polys) for the sake of deformations. Most game platforms have no issues with triangles. 5+ sides are going to give you outright bizarre deformations when animated.

If it's going to be a perfectly flat surface that is not going to be animated or interacted with (dynamics), you can have 100+ sides for all anyone cares. :p
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Old 18-04-2007, 07:56 PM   #3
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I think I now understand what you mean, thanks! How come 3 sided won't matter in games? Won't your objects be moving around, too, like it would in an animation?
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Old 18-04-2007, 08:02 PM   #4
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At render time all the faces get converted to tri's anyhow for rendering, if your model has all quads then the conversion is very predictable as it's a case of splitting the quads in half but if you have n-gons (5sided or more) then you have no way of knowing how the n-gons will be split to convet to tris and can give unpredictable results which is another reason to stick to quads even for a still shot.
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Old 08-05-2007, 10:15 PM   #5
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thanks
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Old 08-05-2007, 10:28 PM   #6
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And to continue where JS left off.

All games render in real time so all models should be triangulated prior to importing into an engine. Triangulation works 100% when models are all quads.

The issue is all about rendering, also its worth noting if you are going to convert your polys into Sub-D or NURBS then n-sided polys will give a lot of issues as will 3 sided. So keep 3 sided to a minimum (only use where there is no other option) and never have n-sided polys.
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