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how to keep triangle texture

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hi, im kinda new in computer graphic so sorry for noob question ;) im having a problem try to understand how texture is kept in CG. i understand its a uv mapping (like x y in cartesian) but how if eg i want to keep a triangle texture? does it mean im going to ignore half of my texture space? thanks in advance

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hi :)

usually all of your textures must be rectangular or in older hardware, square and power-of-two sized (32x32, 64x64, 128x128...)

So if you only want to have a triangle, or a sphere, or any other shape, you´ll have to waste some texture space. Many times, you´ll want to pack images together so they fit as nicely as possible inside the same texture, for example having 2 different triangular shaped images in the same texture to fill it completely, instead of having two square textures, one for each triangle.

If you take a look at old games´ tilesets or character textures, you´ll see how the artists managed to compress everything as tightly as possible to avoid wasting too much space.

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