feat: Add Support for Point Clouds

[bimgeek]

Description

This was noticed while testing the point cloud file mentioned in this thread.

Point clouds sent from Revit can be successfully viewed in the web viewer. It can also be successfully received in Rhino. However, when trying to receive it in Blender, it does not give any error and point clouds are not created. I think point clouds are not supported in Blender (needs confirmation).

Blender is frequently used for point clouds. Especially with the recently added geometry nodes, the capabilities of point clouds in Blender have increased a lot. We should support it.

Expected Behaviour

Receiving point clouds.

Steps to reproduce

1. Enable Blender connector
2. Add attached stream using Add Stream by URL
3. Receive it
4. Examine the Outliner and see if any geometry is created.

Streams/Commits Used

https://latest.speckle.dev/streams/32953abf86

Files Used

https://drive.google.com/drive/folders/14r8YRzcOSq3FtICNu77kuDIUMSc--n8a?usp=share_link

Screenshots

Point cloud file viewed in Revit

Send to Speckle

Received in Blender

[JR-Morgan]

Needs some more scoping, how exactly should this be implemented?

It may not be possible for us to use the new geometry nodes point cloud type.

Currently, instances of bpy.types.Pointcloud can be created, but the point attribute is read-only, and it looks like the Blender devs are yet to expose this to their py API (or implement any user-facing editing capabilities)
see https://projects.blender.org/blender/blender/issues/75717

As an alternative, I can convert pointclouds as vert-only meshes.
Tho, I'm not certain how useful that is to users.

[JR-Morgan]

Closing issue for now, since we are blocked by Blender's API