3D visualization

[LucaMarconato]

Support 3D visualization for points, temporarily disabled.

[melonora]

Hi @LucaMarconato, could you give some context here as to why it was disabled?

[LucaMarconato]

I disabled it because the 3D support at that time was not ready at the transformations level (but now it is). So it would be worth reenabling it and testing it.

Two considerations:

• when all the data is 2D but the points are 3D, probably what would be of most interest to the user would be the just the z-projection;
• we should compare performance of 2D vs 3D, for instance in the point above, the 2D viz would be good enough, especially if the performance of the 3D viz is bad.