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Problems with the Scale Transform Gizmo in the Perspective View
Open, Needs Triage by DeveloperPublic


System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GT 650M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 425.31

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: 2.79

There seems to be a problem with the scale gizmo's handle highlighting, selection and manipulation in the Perspective View. Translate and rotate gizmos are working normally and as expected in all views.

Scale Gizmo:

  1. The scale transform gizmo handles have just a few pixels of grab area around the box handle only (unlike its counterparts rotate and translate which are highlighted when the pointer hovers over anywhere along the axis handle) and this makes it so very hard to select the handle of a given scale axis especially when using a tablet like I do.
  1. At certain view angles certain scale axis CAN NOT be selected for manipulation. They don't highlight either.

The following goes for all 3 modes of the transform gizmo in general:

-The color change that visually communicates to the user that the mouse pointer is over a given handle is so minute, that it's almost impossible sometimes to understand whether if you've highlighted a given axis. This especially goes for the blue colored Z axis handle which highlights to a hue of blue that is only a tad away from the inactive state, making it hard to see whether if you're about to activate it or not. Afaik, these colors are not open to user customization, please correct me if I'm wrong.

This should be considered either a bug or a fault, for it concerns one of the most vital parts of interaction in any 3DCC application.

Ways to reproduce:

1- Create a cube or use the default one.

2- Select it, enter transform mode and switch to scale.

3- Orbit the Perspective view so as to look at the cube slightly from above, pointing at one of the top corners. Hover over the X axis scale handle, the odds are that it won't highlight, meaning you won't be able to manipulate it from your vantage point. If you can't catch it the first time, keep orbiting the view, you'll definitely get it, it is consistent throughout.

4- Hover over the handle line, the axis won't highlight.

5- Orbit the view to a vantage point that allows for the x axis to be highlighted. If you've managed to do so, that's because the scale handle only senses the pointer inside a few pixel threshold constricted to the very center of the handle box.



Event Timeline

Ajlan Altug (jacobo) renamed this task from Problems with the Scale Transform Gizmo to Problems with the Scale Transform Gizmo in the Perspective View.


I deleted my prefs and started from scratch to see whether if that was was the problem or not. And it turns out that my prefs were the main culprit in this strange behavior :-/ So, I'm sending it in for you to see what could be causing it.

Here are my prefs: