How to get a triangle data from perspective camera

OpenGL OpenGL: Basic Coding
1

hi all,
when a render a scene using a perspective camera after rasterization step in the pipeline we get a 2d image/bitmap/buffer.
instead of 2d image/bitmap/buffer can I get a triangle data from a 3D scene.

thanks and warm regards,
Chandrasekhar

2

Take a look at Transform Feedback.

Alternatively, just transform the vertices on the CPU.

3

thanks lot.
regards,
Chandrasekhar