Many on/ontop objects float above support surfaces

[GCChen97]

Describe the bug

I've generated many scenes and noticed that many objects like plants or tabledisplayitem would float above the support surfaces. All the fruits expected to be inside the bowls or other containers would always stay outside of the rooms. Sometimes furnitures also float above and rugs intersect with the furnitures.

Steps to Reproduce

Generate a few indoor scenes.

What version of the code were you using?

1.11

Although I've been tuning infinigen indoor for a long time, it is still challenging to debug these kinds of bugs. I am not sure what parts of infinigen could cause such problem? Maybe the constraint languages or the solver did that? I want to solve this problem. Could you give some ideas on it.

[araistrick]

It is very likely that this is caused by innaccurate placeholder meshes. Usually if you unhide the placeholders in the blender UI they will be touching as expected, but the placeholder is then larger than the actual object and this typically explains the issue.

I will try to debug this this week as well.

[GCChen97]

@araistrick Placeholders in GUI have no vertices and cannot be visualized. Are they deleted by populate.populate_state_placeholders ?