Performance drop with points cloud and apearance issues starting from version 1.97.

[ilyaly]

Description:

Point Cloud tilesets that were rendered without any problems in Cesium 1.96 and prior versions are rendered inappropriately and with a significant performance drops in Cesium starting from version 1.97.

Examples:

1. Appearance in 1.95 - everything is normal:

Appearance in 1.97 and up to 1.103 - points are to dark and there are some weird artifacts on tiles edges. Performance drops in 10-15 seconds of viewing:

Appearance in 1.103 - points are bright as they should be but there are still some weird artifacts on tiles edges. Performance drops in 10-15 seconds of viewing:

Sandcastle example

Details:

Browser: Chrome Version 111.0.5563.146 (Official Build) (64-bit)

Operating System: Microsoft Windows 11 Pro Version10.0.22000 Build 22000

Tileset: generated with Agisoft Metashape.

Comments

Probably related to https://github.com/CesiumGS/cesium/issues/11166.

[ilyaly]

In case it may be helpful - tileset is generated with Draco compression.

[ilyaly]

Seems like Draco compression is not the source of the issues.

Here is a Sandcastle with the point cloud exported from Metashape with compression on,

and here is a Sandcastle with the point cloud exported from Metashape with compression off.

[ilyaly]

Looks related or even duplicating #11270

[ilyaly]

Attaching profile. Trace-point-cloud-no-styling.json.zip

[ilyaly]

I don't see any performance problems in version 1.109, looks like it has been fixed somehow.

[ilyaly]

Actually the issue is still valid in case the point cloud tileset has normals.

Sandcastle with the point cloud with normals.

Sandcastle with the point cloud with no normals.