How to use Vertex Buffer Objects

Question

Imagine I want to draw a pyramid made of triangles.

-Should I create a VBO for each triangle or one containing all triangles?

According to my tests i made once, over 1MB buffers start to slow down rendering, I usually use 512k buffers or less, just to play it safe. — Rookie
– Rookie, Commented Jun 18, 2012 at 22:16

Ben Voigt · Accepted Answer · 2012-06-18 19:09:40Z

3

Selecting a VBO into a context is a rather expensive state change, so using fewer VBOs is definitely advantageous.

answered Jun 18, 2012 at 19:09

Ben Voigt

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4 Comments

João Silva Over a year ago

Thanks a lot. But should I then feed the vbo an array of all vertices of all faces? (same vertex will be given more than one time)

KillianDS Over a year ago

@JoãoSilva yes, you should, but to avoid duplicated vertices, you should use indexed rendering, this will not only reduce the size of vbo, but also make it more likely you hit the post-transform-cache

KillianDS Over a year ago

Also see this guide

Ben Voigt Over a year ago

Careful... vertices may not be repeated even if they overlap. Even if the x,y,z coordinates are the same, the normal vector probably is not.

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