Billboard clamping does not work with tilesets inside of PrimitiveCollection

[angrycat9000]

What happened?

When nesting a Cesium3DTileset inside of a PrimitiveCollection clamping billoards to the ground no longer works.

Reproduction steps

Sandcastlewith tileset added directly to viewer.scene.primitives . Billboard appears on top of 3d tileset as expected

Sandcastle modified to add tileset to a primitive collection and the billboard is not clamped.

Sandcastle example

No response

Environment

Browser: Chrome
CesiumJS Version:
Operating System: Windows

[ggetz]

Thanks for the report @angrycat9000!

I looks like we're only checking for top-level 3D Tiles primitives, and not traversing any collections.