Re: [Plib-users] ssg camera woes / tranformation/coordsystem confusion

[<coz...@gm...>]

>
> Hi. I have some pre-SSG/own code, I'm trying to migrate to SSG.
> However, my camera code screws up; it's as if the axes are switched, or
> worse.
>
> For example, my code has a direction/rotation matrix, that indicates
> the users' rotation around the y axis (it could be a rotation angle
> instead,
> but I'm exploiting that it's a matrix).
>
> However, when I multiply this matrix onto the ssg camera, it rotates
> around
> the _Z_ axis instead!
>   Similar problems happen with other parts of the transform (which I've
> commented out to dissect the problem).


This is a quote from a page at Steve Baker's tuxkart site at
http://tuxkart.sourceforge.net/trackdesign.html :

"I come from a flight-simulation background where we use the convention tha=
t
Z-is-up - so all my software works like that. However, the PLIB loaders kno=
w
that some modellers use Y-is-up and do the axis swap as needed. Hence, in
AC3D, Y-is-up - but in the game, your models will be converted to Z-is-up.
If you find this confusing, forget I mentioned it - everything comes out OK
automagically."

So I would beleive the Z axis is the Y axis are swapped in plib, so just
swapping these values when you load models and in your coordinate handling
code would do the trick.

-Coz