Re: [Plib-users] re:Billboarding

[Steve B. <sjb...@ai...>]

Luca Masera wrote:

> I've used it for a while, but it works differently from what I need so I created a class similar to 
> the ssgaParticleSystem that meets my requirements. 
> Because the billboarding doesn't works, I've studied it and I've understood the steps that bring the 
> objects to be perpendicular to the plane of view (not to the point this is a less but more efficient 
> way to create billboards). When I've printed to the screen the data into the matrix 
> GL_MODELVIEW, used to rotate the objects, I found that they don't rotate because the matrix 
> is, always, the identity matrix. To be sure that the problem is there, I've made the same with 
> the water example: into it the GL_MODELVIEW matrix changes when the point of view moves. 

Remember that in OpenGL, the 'camera' is always at the origin, 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!

---------------------------- Steve Baker -------------------------
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