Question

How can I make my GL_POINT bigger? I’m using glPointSize, but its working just up to some size. So if I write

glPointSize(100);

its the same size as

glPointSize(500);

How can I make it as big as I need?

Answer 1

The OpenGL wiki says:

There is an implementation-defined range for point sizes, and the size given by either method is clamped to that range. You can query the range with GL_POINT_SIZE_RANGE​ (returns 2 floats). There is also a point granularity that you can query with GL_POINT_SIZE_GRANULARITY​; the implementation will clamp sizes to its granularity as needed.

If the size of point you want isn’t in the allowable range consider using a textured quad or even a TRIANGLE_FAN to make a (nearly) circular polygon of whatever size you desire.