Nerf / Visualize unit cube / Modify y-axis?

I am using Nerf.
Is there a way to modify Y axis for the Visualize unit cube, as I guess (?) the user can only use this axis when moving around with the mouse.



I am updating my thread with another story.

I made 2 tries with Nerf. In the first one, cameras are ok. In the second one, Their position is reversed (thus creating a hole as you can see in the picture). Any ideas why ?