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"Layers" in gmax

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us-ohio
I was watching tutorials for ground polys by Austin Sass and I was wondering if layering some elements such as the loft below the runway was fine when it is finally converted by MCX. Is there a certain level of tolerance? Will anything be underground and therefore not visible? Will there be flickering like the preview in MCX? If so then this just got ten times harder.
 
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There is a setting in MCX to delete any polygons not at ground level, make sure that is not checked. I do not know about your questions, though.
 
Lil update, I have been successful in using Gibson's method of not deleting ground polys not at ground level. However I do not know the "tolerance" of MCX in terms of how far a polygon is from the surface before it starts floating, sinking below, and/or flickering.
 
If you are lucky MCX will move all polygons to ground level, but I don't know if it does that. I think so, since you specify a single elevation to place them? One way to test this would be to move a polygon a foot higher than the rest and then see what the resulting GPs look like in the sim.
 
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