[Plib-users] HOT calculation for Y-is-up-coordinate-system

[Jan R. <slo...@gm...>]

Hello,

I'm currently migrating an OpenGL application to use SSG for
rendering. The application uses the quite popular "Y-is-up"
coordinate system alignment. This is no problem as long
as I'm using plain rendering functions. Any model I load is
initially transformed to Y-is-up and the camera is set up
with an (0, 1, 0) up-vector, so everything looks fine.

Now the problem arises how to perform a HOT calculation,
as the ssgHOT() function assumes Z-is-up. I'm sure there is a
way to do the calculation with the right "m"-matrix passed
to ssgHOT(), but I can't get it set up with the right values.

Has someone done this before and give me a hint or a code
snippet?

Kind regards,
Jan R.

-- 
Jan Reucker
email: jan dot reucker at web dot de
web:   http://www.reucker-online.de