As I know the texture is just an image (absolutely 2D), so why do we have GL_TEXTURE_3D? What does it mean? and usage?
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As I know the texture is just an image (absolutely 2D), so why do we have GL_TEXTURE_3D? What does it mean? and usage?
A texture is not absolutely 2d. Most of the time it is 2d but you can also have 1d textures (a line) and 3d textures (a volume). A 3D texture is accessed using three texture coordinates. You can use it when your 3d model can be clipped by a plane. Then instead of seeing the other side of the object (the object is hollow), you can use a 3d texture to make a solid object and view what the plane clipped. So for example, if you model a cell phone and you cut it in half, instead of seeing the backside, you can see the circuitry inside.