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ID3DXSprite

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Hi, I am drawing sprites with the object space flag. My question is, what is the default coordinate system for sprites in object space? I would have though left handed, but things aren't making sense. For example, I draw my background (also a sprite) with depth z = 0.0f. For my other sprites, I draw with depth z = 1.0f. In this setup, the sprites are drawn in front of the background giving the correct visual results. However, with a left hand system, 1.0 is behind 0.0f and so the background should block the sprites. If I change the depth from 1.0 to -1.0, then the background does block the sprites. Another strange thing I noticed. My sprite image was oriented "upside down" by default.

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