3d point cloud

[jackparmer]

@monfera added an incredible 2d point cloud trace type several years ago. I've been seeing "3d point clouds" pop up in some lidar literature. Not sure if this is something we should consider, but perhaps pointcloud3d could be a faster, less featured and less pretty alternative to scatter3d. Here's MATLAB's version:

https://www.mathworks.com/help/vision/ref/pcshow.html

[gvwilson]

Hi - we are currently trying to tidy up Plotly's public repositories to help us focus our efforts on things that will help users most. Since this issue has been sitting for several years, I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our backlog. Thanks for your help - @gvwilson