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I found the Rotation/Translation Mode and its settings to be convoluted and behaviour like the custom center of rotation are not explicitly communicated.
Tbh, I thought that a custom center of rotation needs to be implemented. Turns out that it exists, but is overwritten by the bounding box center upon starting the Rotation/Translation Mode. Selecting a new rotation center within the mode allows for a custom rotation center.

I plan to make this more apparent by:

• ... having a checkbox whether the bounding box center shall overwrite the rotation center
  ... allow input of a specific rotation center (cf. this request)
  ... give a shortcut to the Select Roation Center tool within the Rotation/Translation Mode to communicate the chance to select a roation center more clearly.

I'd love feedback whether this is in the spirit of CC and if there is behaviour I've missed.

Hum, that's probably because the ability to change the CoR has been introduced later than the Rotation/Translation mode...

Adding an option specifically for this looks like very 'niche' and is a bit of a pain (but of course if someone is willing to add it, why not). The shortcut is a very good idea though.

By the way, is the 'double clicking' feature still active/working when this tool runs?).

It does work but unreliably.
The behaviour feel buggy, but I have not understood all the interactions yet:

• double click/Pick Rotation Center without R/T mode works as intended
• double click with R/T paused works as intended for both the cameras CoR and the CoR used in the R/T tool
• double click with R/T unpaused only affects the cameras CoR (not R/T tool)
• Pick Rotation Center tool with R/T (paused & unpaused) only updates CoR used in the R/T tool

This becomes more confusing when drawing the CoR permanently. It visualizes how the CoR visually is only updated when the update affects the camera, i.e. it is not a reliable visualization of the CoR in the R/T tool.
I think this stems from which window is `active` when `doPickRotationCenter()` is called.

I've succesfully implemented a shortcut to the Pick Rotation Center tool but did not yet manage resolving the visual inconsistency.
Next up is the logic to update the R/T tools center of rotation to the cameras CoR.
Then I hope to fix the visuals

Hi Daniel, can you help and point me in the right direction of:

1. how would widget (not mainWindow) (or its window) listen to an event of the PickingHub (like R/T tool to the picking of a point)?
It seems like another widget cannot listen to the same events, as it does not have the pickingWindow required to perform window specific tasks during `onItemPicked()`

2. is there an intended way for a widget to pass information to its window (like the Rotation Center coordinates)?
`rotationCenter` currently lives within `ccGraphicalTransformationTool` which means that I cannot draw its Position within the active Window without significant changes to the access specifiers

Thank you in advance!

I think the simplest way would be for the ccGraphicalTransformationTool to add a sphere to the 3D display, and change this sphere center to match the rotation center?

Hi, I've been using CC for 3 years and for me, an easy custom rotation center is a very desired feature. Sphere is a good idea, I think.
Also, this should be available for multi-entity selection too.