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OpenGL
1

Hi all,

I have a program which renders many point-primitives, which I can scale from the glsl shader code using point size extension.

For that I use the NVidia 8800 GTX, which works fine. However on the NVidia 8800 GTX <u>mobile</u> the point primitives show up as squares.

Anyone any idea what could be wrong here?!

Thanks

2

AFAIK the most OpenGL implementations render the points as squares. Actually on the gf8800 gtx it was the first time I have seen round points. If you want this behaviour on all cards I would suggest to use billboards with a texture.

3

Enable alpha blending ?

4

Maybe you forced antialiasing in the graphics driver for the NVidia 8800 GTX.

5

Hi,

Thnx. I’ll check for the alpha blending, but I’m sure I disabled anti aliasing.

Furthermore it turns out that under Linux (ubuntu) problems do not occurs. Only the Windows driver seems to render squares. I hope it is not a matter of driver implementation?

Roy

6

As NiCo suggested, it could be that in Linux you’ve enabled antialiasing in the NVIDIA control panel (nvidia-settings) which is overriding your application’s settings.

7

Ok guys, you were right. I had to enable anti-aliasing through GL_POINT_SMOOTH. Now everything looks fine!

Only difference I notice still is some “flickering” while rotating the objects, which does not occur on the non-mobile graphics card.

Could this have to with the refresh rate of my screen?

Thanks.

Roy

8

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