another scientific and engineering issue: z-up vs. y-up

[awolven]

It's probably good that I forgot to lump this together with the read-default-float-format stuff, because is a whole nuther ball of wax. In most content creation progams for artists, Y is the UP vector, so the grid plane is the x-z plane and y is up with the camera arcball movement. Usually in CAD software, though, Z is UP because of it's roots in pencil drafting.

We should be able to dynamically change the camera/scene from Y-UP to Z-UP, and for the heck of it X-UP with a very quick settings change.