@ockham, not sure whether you created the grid in Amapi, but here's a render of the second simplest possible, single sided plane with hole (square; simplest would be triangular). I hacked it together by hand based on the P4 single sided square prop which is a 4 vertex, single facet square. Here's the obj file contents. v -0.050000001 0 0 v 0.050000001 0 0 v 0.050000001 0.1 0 v -0.050000001 0.1 0 v -0.016666667 0.033333333 0 v 0.016666667 0.033333333 0 v 0.016666667 0.066666667 0 v -0.016666667 0.066666667 0 vt 0 0 vt 0 1 vt 1 0 vt 1 1 vt 0.33333333 0.33333333 vt 0.33333333 0.66666667 vt 0.66666667 0.33333333 vt 0.66666667 0.66666667 g surround fo 1/1 2/3 6/7 5/5 fo 2/3 3/4 7/8 6/7 fo 3/4 4/2 8/6 7/8 fo 4/2 1/1 5/5 8/6 I textured it in P6 with a small grass pattern jpeg as a 2D image node in the Diffuse channel. Renders no problem. I'd be interested to see the grid with hole object for comparison. Did you try UVMapper on it?

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