Lightmap UV doesn't generate if physics body is enabled in blender import settings

[prototype5885]

Godot version

4.0.alpha14

System information

Windows 11, Desktop Vulkan, NVIDIA RTX 2070

Issue description

Using the blender import, lightmap baking doesn't work (I think it's not generating UV2 map) for select meshes if physics body is generated for them.

Steps to reproduce

In the reproduction project, in the blender_test.blend import settings, it has 2 cubes and 1 other mesh. One cube has generate physics enabled, the other doesn't. The one with generate physics enabled has non functioning lightmap baking. After disabling physics body generation for that cube and reloading the scene, the lightmap baking works as intended.

Minimal reproduction project

Lightmap Bug.zip

[Calinou]

I think this is expected, as RigidBodies will be moving as soon as they're added to the scene. Baked lightmaps cast onto them will be invalid if the object moves. (In some cases such as for moving platforms or doors, this can be a reasonable compromise, but you shouldn't use RigidBody for those anyway.)

[prototype5885]

I think this is expected, as RigidBodies will be moving as soon as they're added to the scene. Baked lightmaps cast onto them will be invalid if the object moves. (In some cases such as for moving platforms or doors, this can be a reasonable compromise, but you shouldn't use RigidBody for those anyway.)

its supposed to work with static body, like the main ground/wall where your character actually walks

[Calinou]

I can confirm this on 4.0.alpha 0c5f254 (Linux, NVIDIA 515.57).

Left has StaticBody generation disabled, right has StaticBody generation enabled:

Also, it should be noted in the scene tree (which you can view by right-clicking the imported scene and enabling Editable Children), the StaticBody is a child of the MeshInstance3D, not the other way around. I'm used to it being the other way around…