3D

[Igo kyu]

Originally Posted by JVM

- CPU side, two set of image primitives calculations (not equivalent to exactly twice the used computing power for 2D, as the relative positions for all objects in each image are the same)

I believe this is incorrect, the CPU generates the positions of the objects, the GPU takes it from there. So, only one CPU pass.

- GPU side, two full rendering of a complete image at selected resolution

This is where you need a lot of GPU grunt.