ssgContext bug and remedy (was Re: [Plib-devel] Simple SSG examples)

[Sam S. <sa...@sp...>]

RE: [Plib-devel] Simple SSG examplesThere were a couple of problems with
it - one was my fault (polygon winding issues - should had realised back
face culling was on by default, doh! ), and the other is a bug in ssg.

The ssgContext class initialises the camera matrix to the identity
matrix and not _ssgOpenGLAxisSwapMatrix.  So if you do nothing with the
camera you end up with opengl's coordinate covention (y is up), rather
than ssg's (z is up).

Anyway it works now, so by tomorrow I should have some real simple ssg
examples to contribute.  I've got a simple textured spinning cube, an
explosion, and a simple scene you can fly round (using the quaternion
routines).  Nothing hot, but I always find I learn a damn site quicker
from examples than documentation so I imagine these will be of use to
people.

Sam