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GL_POINTS Slow

Started by DrPowers Jun 14, 2006 at 4:35 PM 1 reply 1.6k views

Original Post

Jun 14, 2006 at 4:35 PM

I was wondering... and this might be impossible... if there was a faster way to display a point cloud rather than GL_POINTS. My target is to show about 100,000 points and be as fast as possible. Let me know if there is a better technique than glbegin(GL_POINTS) 100,000 x glColor3f(r, g, b); glVertex3d(x, y, z); glEnd() in terms of speed

Eric Lengyel

108

Eric Lengyel

Jun 14, 2006 at 5:40 PM

Put your point positions and colors in arrays using glVertexPointer() and glColorPointer(), and then call glDrawArrays(GL_POINTS, ...) instead. This will be much faster than using 100,000 glColor() and glVertex() calls. If you want even more speed, look into using vertex buffer objects (VBOs).

DrPowers

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DrPowers

Jun 15, 2006 at 9:24 AM

Quote:
Original post by Eric Lengyel
Put your point positions and colors in arrays using glVertexPointer() and glColorPointer(), and then call glDrawArrays(GL_POINTS, ...) instead. This will be much faster than using 100,000 glColor() and glVertex() calls. If you want even more speed, look into using vertex buffer objects (VBOs).

Thats exactly what I was looking for... thanks.

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