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Animation with textured quads

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I've decided to write a 2d game with DX9 using textured quads. I've done some projects just to see how it all works, I got the most of it, but I still don't know how to animate the quads. And by that I don't mean to move them around, I'm talking about fast switching between images to get the illusion that someone/something is moving. Let's say that an object has 30 frames of animation stored in one bitmap that I want to cycle through. I know I can cut pieces of the bitmap with StrecthRect, but how do I apply them on a primitive when I'm using SetTexture?

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You don't. You should remap the texture coordinates in your vertex data.
So the animated quads should definately be in dynamic VBs. That's how I would do it. Copyind textures around is expensive, but it depends on the scale of the project.

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