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Maybe I'm just tired, but was having a hard time following your post.  Maybe bullet points?  Hehe

I'm suspecting this is simply because the camera isn't pulling back to take the snapshots.

  • The snapshot camera pulls back to fit the bounding box of the model.
  • A bounding box doesn't exist without a collider on the prefab, so make sure there is some sort of collider added.
  • The button that creates prefabs from raw models adds a mesh collider to each one, so those would meet the requirements.

Let me know if manually adding the mesh colliders works for you.  I can imagine that there will be times where a user won't want/need a collider, so maybe I'll have the generate thumbnail class add colliders to any prefabs that are missing them, just for the photo. =)