A 4 by 4 matrix applied to a texture coordinate.

Initialize	Initializes a Texture Matrix to the identity matrix.
InitializeByValues	Initializes a Texture Matrix. The subscripts define [row][column].
InitializeWithAffineTransform	Initializes a Texture Matrix from a Matrix. The upper left 2x2 matrix defines rotation and scaling. The top two elements of the last column define translation.
InitializeWithRectangles	Initializes a Texture Matrix from texture corner points. Normally, a texture is mapped such that the lower left corner is texture coordinate (0, 0), the lower right is (1, 0), the upper right is (1, 1), and the upper left is (0, 1). This code remaps those corners to new corners. For example, remapping the lower left corner to (0.5, 0), the lower right to (1, 0.5), the upper right to (0.5, 1), and the upper left to (0, 0.5) would rotate the texture 45 degress.