HI. I have imported this 3D CAVE obj object into Element 3D and from outside its look goods, shape preserved but when you entering cave it is with holes and everything mess up inside. But in blender, where this cave was made everything looks good. Maybe i have to click something in blender before importing or i can fix it in Element?
It's impossible to tell what's going on without seeing the properties of the object inside Element 3D. Select the layer in the timeline, press the U key twice and send us a screenshot. Maybe we will have something to go on.
set the object to Auto Normals in the Element 3D interface.