blending not quite working ...
Author
hello,
I''m having some trouble with blending. Transparent objects don''t show up quite right when theres an opaque object behind it. Best way to describe this is to show you.. heres an exe i uploaded:
http://www.postmodernist.com/richard/SolarSystem001.rar
Currently, the objects are drawn in the following order:
1. the earth (opaque)
2. earth''s clouds (alpha = 0.7)
3. earth''s atmosphere (alpha = 0.5)
4. earth''s moon (opaque)
5. the sun
thanks for any help,
rich
From what I've done with this subject, is that when doing blending of different 3D objects, you need to disable the depth mask when drawing the blended object.
Something like:
// draw non-blended objects here
glEnable(GL_BLEND);
glDepthMask(GL_FALSE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
// draw blended object here
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
Play around with that and see if you can get what you want.
- Mike
P.S. I didn't download the program (rar format is not popular, use zip) so this may not be correct.
EDIT: typo
Edited by - mkaltner on November 8, 2001 7:01:30 PM
Something like:
// draw non-blended objects here
glEnable(GL_BLEND);
glDepthMask(GL_FALSE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
// draw blended object here
glDepthMask(GL_TRUE);
glDisable(GL_BLEND);
Play around with that and see if you can get what you want.
- Mike
P.S. I didn't download the program (rar format is not popular, use zip) so this may not be correct.
EDIT: typo
Edited by - mkaltner on November 8, 2001 7:01:30 PM
Author
thanks for the reply 
I tried the depthmask true/false and it works. I was using it already but in the wrong way.
much appreciated
btw, uploaded as .zip, use down arrow to move back a bit so you can see the sun
I tried the depthmask true/false and it works. I was using it already but in the wrong way.
much appreciated
btw, uploaded as .zip, use down arrow to move back a bit so you can see the sun
Author
and the fixed exe ... (textures are in zip)
http://www.postmodernist.com/richard/SolarSystem.exe
http://www.postmodernist.com/richard/SolarSystem.exe
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