GL_POINT_DISTANCE_ATTENUATION

Jonathan

I was playing a bit with points, but I just can't figure this out. As soon as I change any of the values the slightest bit, my points render at (near?) zero size.

For example:

Code:

GLfloat distance_attenuation[3] = {1.0f, 0.0f, 0.0f};
glPointParameterfv(GL_POINT_DISTANCE_ATTENUATION, distance_attenuation);
glPointSize(32.0f);
glBegin(GL_POINTS);
glVertex2f(0.0f, 0.0f);
glEnd();

renders a 32x32 block in the middle.

Code:

GLfloat distance_attenuation[3] = {1.001f, 0.0f, 0.0f};
glPointParameterfv(GL_POINT_DISTANCE_ATTENUATION, distance_attenuation);
glPointSize(32.0f);
glBegin(GL_POINTS);
glVertex2f(0.0f, 0.0f);
glEnd();

renders a single pixel in the middle. Smooth points don't show up at all, even without blending.

I checked for errors, but of course OpenGL reported none.

hannesh · **Joined:** Mon Sep 06, 2010 7:47 pm **Posts:** 1

You have to set the minSize and maxSize of points before using distance attenuation. The driver looks at this instead of pointsize when your values aren't the default { 1.0, 0.0 0.0 }.

Clutch

Over 2000 views and only one possibly helpful tip

Jonathan

Wow, it's been so long I forgot what I was doing there. But thank you for your help.

GL_POINT_DISTANCE_ATTENUATION

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