Enable/hide shadows for object/ground plane

[thomasblanchard21]

Hi! First of all thank you for this tool, it's way simpler to implement than any other solutions I found! I'm visualizing 3D human animations in the viewer as in the image below:

In order to correctly assess the quality of the movement/grounding of the model, I would like to add a floor to this model, as well as having the shadow casting correctly on that floor.

Solutions I've tried:

• Adding a floor in Blender directly to the model; problems: no shadow on the floor, and floor cannot be in z=0 or it is not rendered
• Adding a transparent grid in Blender; problems: there is a shadow but it gets increasingly more noisy as the floor get bigger, so it cannot cover the whole range of motion
• setting a skybox image with height=0.1; hard to get a normal grid pattern since the image is highly distorted

Next solution I will try is adding a floor directly in the model viewer js, but I would love to know if someone has an easier solution. Thanks!