Are you checking glError()? I think the max point size is 50.0 on
some renderers.
Kent
On May 16, 2007, at 8:35 PM, Wesley Smith wrote:
> Hi,
> I'm on OSX 10.4.8 and trying to get point sprites to work. I'm not
> seeing any attenuation in size in the sprites. All I get is
> GL_POINT_SIZE_MIN_ARB for all points. Here's the code. Is there
> something I'm forgetting?
>
> thanks,
> wes
>
> glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> glMatrixMode(GL_PROJECTION);
> glLoadIdentity();
> gluPerspective(45., aspect, 0.2, 100);
> glMatrixMode(GL_MODELVIEW);
> glLoadIdentity();
>
> glTranslatef(0.0, 0.0, -10.);
> glRotatef(-0., 1.0, 0.0, 0.0);
>
> glEnable(GL_POINT_SPRITE);
>
> glEnable( GL_BLEND );
> glBlendFunc( GL_SRC_ALPHA, GL_ONE );
>
> glPointSize(100.);
> glPointParameterfARB( GL_POINT_FADE_THRESHOLD_SIZE_ARB, 60.0f );
> glPointParameterf(GL_POINT_SIZE_MIN_ARB, 1);
> glPointParameterf(GL_POINT_SIZE_MAX_ARB, 100);
> glPointSize(100);
>
> float quadratic[] = { 1.0f, 0.0f, 0.01f };
> glPointParameterfvARB( GL_POINT_DISTANCE_ATTENUATION_ARB,
> quadratic );
>
> ;
> glBegin(GL_POINTS);
> glColor4f(1., 1., 1., 1.);
> for(int j=0; j < data_height; j++) {
> for(int i=0; i < data_width; i++) {
> glVertex3fv(data + 3*(j*data_width + i)); //a cone
> }
> }
> glEnd();
> glDisable(GL_POINT_SPRITE_ARB);
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