VoxelGrid.create_from_point_cloud should allow for choosing color reduction method other than avg

[IDoCodingStuffs]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for main branch).

Proposed new feature or change

Currently, voxel grid from point cloud defaults to averaging colors per the docs: https://www.open3d.org/docs/release/python_api/open3d.geometry.VoxelGrid.html#open3d.geometry.VoxelGrid.create_from_point_cloud

The problem is, that is not always desirable behavior. I am trying to reconstruct a voxel grid from MRI slices with different orientations where I am feeding different modalities as their own channels:

When I convert this to a voxel grid, this leads to artifacts where these slices intersect due to averaging:

Ideally, I should be able to reduce by sum or max per channel instead of average.

References

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Additional information

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[rxba]

Hey @IDoCodingStuffs , I've added the feature to select between average, min, max and sum color mode for VoxelGrid creation from PointCloud and opened a PR for this.