How do I stop shadows from being cast on an object that is meant to be inside or underground? I thought the prefix -vertexlighting in the .msh.option would help but it doesn't really.
I remember someone from years ago told me to put in the msh option -shadowon or something like that.That actually killing the shadow of the model but i am not sure anymore.It was long time ago.But give it a try.
EDIT:sorry i didn't read correctly your question.I do not know.
I figured it out: even strictly interior-only objects need shadowvolumes. The reason I didn't figure it out before was because ZETools imports MSHs but turns the shadowvolumes into nulls.