CubeTexture.AddDirtyRectangle Method ()
Adds a dirty region to a cube texture resource.
For performance reasons, dirty regions are recorded only for level 0 of a texture. For sublevels, it is assumed that the corresponding (scaled) rectangle or box is also dirty. Dirty regions are automatically recorded when CubeTexture.LockRectangle is called without LockFlags.NoDirtyUpdate or LockFlags.ReadOnly.
The method call is invalid. For example, a method's parameter might contain an invalid value.