point - gl_PointSize set to world coordinates fixed size

Question

I want to keep my points dimensioned to real worls coords. For example set my points with a size of 10mm

In order to do that I am using this formula:

vec4 tPosition = vec4( position, 1.0 ); 
float distance2 = distance(tPosition.xyz, cameraPosition);
gl_PointSize = pointSizeInMM * canvas_size_height /(2.0 * distance2*abs(sin(camera.fov/2.0)));

Do Am I doing anything wrong?

Best regards

question from:https://stackoverflow.com/questions/65950650/gl-pointsize-set-to-world-coordinates-fixed-size

Answer 1

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