Coordinates transformation

Question

I have two 3D objects in space and i want to copy the points from one object to another. The problem is that these objects don't share a common coordinate system and i have to do coordinate transformations. I have the local transformation matrix for both objects and i have also access to the world transformation matrix. I know there's some calculations to be done using these transformation matrices but i don't know how.

How can i transform one point in the first object so that it has the same position(relative to the world coordinates) if i copy it in the other object( or its coordinate system )?

Thanks

Answer 1

Well, you have to apply the conversion operator that you have. E.g., the relation between polar (r, t) and cartesian (x, y) coordinates is defined by:

x = rcost
y = rsint