Character gets stuck within a mesh even though collisions enabled

[Takemura]

This topic might help:

Collisions on Flipped Normals

Firstly, the gltf/glb has right handed coordinate system and BabylonJS coordinate system is left handed. So you need to set scene.useRightHandedSystem = true before importing. Else you have to consider negative z-scaling, which can cause unpredictable collision problems. The main cause of the collision failure seems to be that the flipped mesh has inverted normals and also has a right handed coordinate system. Usually the triangles of gltf are counter-clockwise, while Babylons (left handed) are…

IIRC @bghgary wanted to modify glTF-importer, not sure if this is took into account aswell.