Some Twinmotion library assets do not render in Path Tracer in files with a large number of assets

Reported in SF [Link Removed]

In scenes containing large numbers of certain Twinmotion assets, when activating Path Tracer, some of the assets will not render. The assets will render normally in Standard GI and Lumen rendering.

This does not appear to affect imported assets or assets from the Sketchfab library. From the Twinmotion library, only larger assets, such as certain vehicles will be affected.

This occurs when using both instances and copies of the assets.

Confirmed to occur with the following TM assets:

• US Dump Truck
• US Dump Truck Loaded
• EU Dump Truck
• EU Dump Truck Loaded
• All Sailing Boats
• All Yachts

Attached scene contains 1000 instances of a Dump Truck asset displaying this issue.

1. Download and open the attached scene
2. Enable Path Tracer

Result: Some of the assets will not be displayed in Path Tracer

Use a non-Twinmotion library asset, such as a Sketchfab asset, as a substitute for any affected objects.