VolumeRendering
3D Texturen
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3D Textures are defined as unit cube in the 3D Texture space. The three texture coordinates are named s,t and r.
Each vertex is assigned a texture coordinate, three of which define a plane in 3D texture space from which the texture is sampled.
With OpenGL 3D texture coordinates are specified as follows:
glTexCoord3f(s,t,r);