Assembly: Microsoft.Xna.Framework.Graphics (in microsoft.xna.framework.graphics.dll)
A texel represents the smallest unit of a texture that can be read from or written to by the GPU. A texel is composed of 1 to 4 components. Specifically, a texel may be any one of the available texture formats represented in the SurfaceFormat enumeration.
A Texture3D resource (also known as a volume texture) contains a 3D volume of texels. Since it is a texture resource, it may contain mipmap levels. Figure 1 shows a fully populated Texture3D resource.
Figure 1. Texture3D Resource Architecture
When a Texture3D mipmap slice is bound as a render target output (by creating a RenderTargetCube), the Texture3D behaves identically to an array of Texture2D objects with n array slices, where n is the depth (third dimension) of the Texture3D.