The Nuke 3D Engine - Nuke 101: Professional Compositing and Visual Effects - page 391

The camera appears to be on its side. There are all sorts of differences between
3D applications that involve scale and rotation. In this case, the world axis (the
3D world's definition of what is up or down and what is right or left) in the ap-
plication that generated the camera is different than the axis you have in Nuke.
This is easily fixed, though. Because the camera has animation on every frame,
it's inadvisable to rotate the camera itself. Instead you will use a new node called
an Axis node. The Axis node lets you move things around in the 3D world.
12. MakesurenothingisselectedandcreateanAxisnodebyclickingthe3Dtoolbox.
13. Connect Camera1's input to Axis1's output ( FIGURE 9.11 ).
Figure 9.11. Connecting an Axis node to the Camera node.