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Newbie question about triangle strip/fan

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Hi, I''m trying to developp my own model format wich will contains the best features of both the MS3D and MD2 file formats. I read ShinningKnight''s tutorial and he told something about optimization from using triangle strip or fan in the MD2 format. What exactly are those ways of displaying triangles? How can I get optimization from them? Also, does anybody knows a picture editor that support the alpha channel and that can edit it?

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http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dx8_c/hh/dx8_c/graphics_using_373n.asp

I know it''s DirectX but it does an explanation of triangle strips/fans. They are used to quickly draw triangles next to each other, minimizing the data you send to the gfx card and the number of calls you have to make.

There''s probably a nice OpenGL explanation of it, but the concept is the same.

FatalXC

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