Hi again I decided that the best way to test my grate idea was to create it and export it and run my kart on it. I did all that but the screen did not refresh after that. So I tried swapping the grate out for a plane but that did not help. I've included a screen shot from the later attempt.
I got no errors during export but when running STK I go many here's a few of them they are all pretty much the same message:
[*]Warning: quad has wrong orientation: p0=15.422000 0.796000 -10.396000 p1=5.307000 0.796000 -12.420000
The quad will be swapped, nevertheless test for correctness -
quads must be counter-clockwise oriented.
Warning: quad has wrong orientation: p0=11.121000 0.796000 -12.925000 p1=0.505000 0.796000 -12.828000
The quad will be swapped, nevertheless test for correctness -
quads must be counter-clockwise oriented.
[/*]
I made sure to apply the rotation, location, and scale before exporting and everything is facing z up.