[Plib-users] Re: billboarding

[Luca M. <luc...@li...>]

Hi Steve,

> Remember that in OpenGL, the 'camera' is always at the ori=
gin, staring down the Z axis.
> 
> If you want something to be aligned =
to the plane of the screen, you *WANT* your
> modelview matrix to be the=
 identity matrix!

I'm a newby of 3D programming, I didn't know that th=
e camera is always located at 
the origin. 

However, I solved the pro=
blem (and the matrix is rightly the identity matrix) 
increasing the bou=
nding sphere of the particle system. At the first attempt I've set it =0D
=
more or less at the size used in the water example. In flightGear, though=
t, I've noticed 
that the distances are much more great so the sphere's =
size was too little. 
When I've enlarged it, the objects stop to disappe=
ar when the point of view rotates. 

I was lost in a glass of water... =
the solution was more simple then what I'm expecting.

Thanks, Luca
=0D
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