How to select cloud points by mouse drag on a custom GUI visualizer
- Dominant language
- C++
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Description
### Checklist
- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).
### My Question
Is there a way to implement the selection feature in O3DVisualizer in a custom GUI I have built? How can I select specific cloud points and get their index values? I have drawn a red box around the features I want from the O3DVisualizer for my custom GUI.
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