In my quest to learn game development with Unity, been pondering something of a mathematical issue.
Like most game engines, Unity uses a left handed orientation system. My freebee 3D editor Blender, however, seems stuck in a right handed one.
So what is involved.
A right handed system has increasing z-values moving up.
This is useful in modeling. Below, the default window in Blender.
The Unity interface, keeping the z axis running in the back, with the camera in the front:
The two systems are fundamentally different. In effect, one would need to swap the -y and -z axis.
Below, the short arm is -x, the long -y and the black -z.
There is a programming solution for images:
Things are more complicated for motion scripts, and users report all kinds of chaos on forums.
I think it has to do with the fact that affine spaces and vector spaces are not one and the same the same:
I have read that, Maya 3D, the very popular editor, does let one choose the coordinate system as a user preference.
