Create a Matrix4 instance for 'Affine' transform
Arguments
- m
 a matrix or a vector to be converted to the
Matrix4instance;mmust be one of the followings: for matrices, the dimension must be4x4,3x4(the last row will be0 0 0 1), or3x3(linear transform); for vectors, the length must be16,12(will append0 0 0 1internally),3(translation), or1(scale).