Grounding Shadow in RealityKit

Hi guys,

In session 603, it has been mentioned that ARView provides 2 different grounding shadow, a simple drop shadow or a more accurate ray trace shadow. However, I can only turn the grounding shadows on and off in renderOptions using .disableGroundingShadows. Is there a way I can switch those 2 shadows render?


And I've also noticed that if there is only one object in the ARView, the grounding shadow is solid, but if I put more than one object into the ARView the shadow will fade off. If I put 10 default box in one scene, I can barely see any grounding shadow. Any idea how the grounding shadow works?