We have been running into this rotation problems every now and then but could not pinpoint or understand the behavior. I think I got it now and will try to explain:
When rotating with Ctrl+Alt+RMB, the perceived “speed” depends on the lens length (wider lens=slower speed).
This becomes an issue when working with zoomed-in cameras. At some point the pan becomes unusable because it is way too fast.
You can test it out in the attached file. Try Ctrl+Alt+RMB rotation - you will see a big difference between V1 and V3.
Pan_speed_sample.3dm (76.6 KB)
The constant speed would be much better/desired behavior and would feel most natural. It seems like “under the hood”, the camera rotation angle could be screen-movement-dependent, and not global, if it makes sense.
Imagine that the rotation angle is driven by the pixel distance on the screen, and not constant angle-per-pixel…
@Mikko - is that something you can comment on?