Cesium ion Melbourne pnts not supported

[jailln]

Your Environment

• Version used: v2.39.0
• Browser Name and version: Chrome and FF
• Operating System and version (desktop or mobile): Ubuntu 20

Context

The point cloud of Melbourne provided by default on Cesium ion (id 43978) does not work in itowns. The following error is raised by the PntsParser:

Steps to Reproduce (for bugs)

1. Create a Cesium ion account, go to Asset Depot and add the "Melbourne Point Cloud" dataset to your assets
2. Create a C3DTilesIonSource and a C3DTilesLayer and add it to a GlobeView

Expected Behavior

The tileset should be displayed.

Actual Behavior

Nothing is displayed

Possible Cause/Fix/Solution

It might be due to some option that we don't support for pnts tiles in the PntsParser.

[jailln]

This issue happens when point clouds have the 3DTILES_draco_point_compression extension that is not yet supported by itowns.