Create a transformation from one oblique coordinate system into another.

Input parameters:

1. So → Point of origin of the source coordinate system.
2. Sx → X unit vector of the source coordinate system.
3. Sy → Y unit vector of the source coordinate system.
4. Sz → Z unit vector of the source coordinate system.
5. To → Point of origin of the target coordinate system.
6. Tx → X unit vector of the target coordinate system.
7. Ty → Y unit vector of the target coordinate system.
8. Tz → Z unit vector of the target coordinate system.

Output parameters:

1. Tr → Mapping transformation.