From: Raphael Grasset (raphael.grasset++at++imag.fr)
Date: 05/27/2002 04:44:56
Christian Skluzacek wrote:
> Hi,
> Is there any way to write directly to the depth buffer
> (i.e. set during glWriteBuffer() and then
> glCopyPixels())? I have a background photo with trees
> and also distance information to the trees (the viewer
> remains at the same location but just looks around)
> and I want the trees to occlude objects in the scene.
> I thought I read a while back about someone reading
> from the depth buffer, but how do you write to it?
>
> Regards,
> Chris
>
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Hello,
You can use glColorMask in your personnal pfDraw(). You can define
geometry for your tree : 3d points if you have depth map.
The main method is :
At first, you must desactivate render of red, blue, green, and alpha
component with this function :
glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE)
render your tree() (they are just render in depth)
and reactivate other components
glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_FALSE)
and do your final pfDraw()
(you can also call this method in preDraw and postDraw of your tree).
Regards,
Raphael
(this method is use for realiste occlusion of real object with virtual
object in augmented reality).
-- __________________________________________________________________________ Raphaël GRASSET | Doctorant (Phd Student) | iMAGIS-GRAVIR -------------------------------------------------------------------------- raphael.grasset++at++imag.fr http://www-imagis.imag.fr/Membres/Raphael.Grasset Tel:+33(0)4.76.61.55.17 Fax:+33(0)4.76.61.54.40 iMAGIS- Laboratoire GRAVIR INRIA Rhône-Alpes 655, avenue de l'Europe 38330 Saint-Ismier Cedex FRANCE __________________________________________________________________________
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