A variety of methods are provided to manipulate the translation, scale, and rotation components of the matrix.
Methods operate on the matrix at the top of the stack.
Many objects, such as vtkActor and vtkCamera , use this class for performing their matrix operations. It is very important to realize that this class performs all of its operations in a right handed coordinate system with right handed rotations. Some other graphics libraries use left handed coordinate systems and rotations. By default the initial matrix is the identity matrix. It then creates an identity matrix as the top matrix on the stack.