Ching-yu Lin

### Checklist - [X] I have searched for [similar issues](https://github.com/isl-org/Open3D-ML/issues). - [X] 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...

This PR introduces a new IO module for segmentation. Specifically, a metaclass `BaseSegmentationHandler` and a class `NumpySegmentationHandler` are introduced. This module paves the way for enabling segmentation mode. See https://github.com/ch-sa/labelCloud/pull/87...

POC semantic segmentation

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This PR is intended to open a discussion rather than a merging-ready PR, although most of the heavy-lifting: OpenGL, math has implemented. https://user-images.githubusercontent.com/60384727/177585341-b5b9bdca-99b8-40e6-8936-4c12533f67d0.mov This PR introduces a bare minimum requirement...

### Checklist - [X] I have searched for [similar issues](https://github.com/isl-org/Open3D-ML/issues). - [X] 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...

The text in GUI is not visible in dark mode in Mac OS.

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**Describe the bug** The text in GUI is not visible in dark mode in Mac OS. **To Reproduce** Steps to reproduce the behavior: 1. Go to `System Preference` 2. Click...

Show class colour and filter points by class in segmentation model

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This PR introduces a section to show the segmentation color and check boxes to adjust points visibility and assignablility. The color is useful to remind the annotator of the existing...