identxxy

VoxelGrid connot create from Octree, vice versa.

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### 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...

fix parameter blind not working for livox.

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The condition here should be **not the same** && **not in blind**, but missing a pair of () to group **not the same**.

Tracking loss in code seems not consistent with the paper.

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To my understanding, in the code, the tracking loss is **opacity** * **L1 loss** * **a complicated mask (silhouetee)** , but in the paper, it is simply **L1 loss**. In...