P3D v4 Horrible lines in google skechup

Hello I am new in the development of scenarios a while ago I made a ground poly with skechup but at the time of testing in the simulator I get these strange lines


It is difficult to notice, but they are black lines that appear in the background of the image, these lines disappear when I approach,
the same happens with skechup when I apply single text to the object, that's when those lines appear


how can i solve this help please
use this video as a guide
Sorry for my bad english


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FSDevConf team
Resource contributor
Is your airport properly flattened? Small elevation differences might give cracks between polygons.