Hello everybody, I’ve got a problem with GL_POLYGON_SMOOTH on radeon 9200, and it’s not my first contact with this problem. Screens will illustrate it perfectly…
polygons NOT smoothed:
http://img105.imageshack.us/my.php?image=fmse01ft0.jpg
polygon smoothed:
http://img250.imageshack.us/my.php?image=fmse02xg0.jpg
The question is - have anybody encountered this kind of problem ? Is it only radeon 9200 problem ? Is there any way to prevent it ?
Are you saying you only get this result on 9200 cards?
I would have a look at your GL_BLEND settings.
GL_POLYGON_SMOOTH is hard to do right.
Polygons must be sorted back to front …
http://www.opengl.org/resources/faq/technical/rasterization.htm#rast0150
Discussions on the subject :
http://www.opengl.org/discussion_boards/ubb/ultimatebb.php?ubb=get_topic;f=3;t=015356#000000
The modern approach is to use FSAA/MSAA :
http://www.opengl.org/registry/specs/ARB/multisample.txt
Nehe tutorial on the subject :
http://nehe.gamedev.net/data/lessons/lesson.asp?lesson=46
