[Plib-users] Particles & billboarding

[<s4...@sp...>]

Hi,

at last I managed to add the particles to FlightGear and to make them
follow the aircraft (it's not a trail made by a single Particle System
but, instead, a trail of Particle Systems... It's a performance "eater",
but it works).
The results are in:

http://myweb.tiscali.co.uk/vmeazza/FlightGear/particle1.jpg

http://myweb.tiscali.co.uk/vmeazza/FlightGear/particle2.jpg

http://myweb.tiscali.co.uk/vmeazza/FlightGear/particle3.jpg


Anyway I've a problem about the "visibility" of the objects. They are
visible only if the view is directily afore them. I've set to TRUE the
_turn_to_face, but seems that it doesn't works right. In the code I've
found that it's used the matrix GL_MODELVIEW_MATRIX, but nowhere in
FlightGear it's istantiated. Maybe is this the problem? or the matrix is
created by OpenGL itself? In the latter, how the matrix that defines the
viewer position is defined (I'll try to get the useful data from
FlightGear and use it into the class ssgaParticleSystem, but I'm a newby
in 3D graphics and I don't know which data needs to be used).

Thanks, Luca