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How do I render 2D sprites in OpenGL given that I have a png of the sprite? See images as an example of the effect I’d like to achieve. Also I would like to overlay weapons on the screen like the rifle in the bottom image. Does anyone know how I would achieve the two effects? Any help is greatly appreciated.
In 3D terms, this is called a “billboard”. A billboard is completely flat 2D plane with a texture on it and it always faces the camera.
See here for a pure OpenGL implementation: http://nehe.gamedev.net/data/articles/article.asp?article=19
Just about any 3D engine should be able to do them by default. Ogre3D can do it, for instance.