Possible problem with cracking

[erich666]

For your image note that during rendering you could experience cracking, as the place where the two top rectangles meet the rightmost vertex on the smaller rectangle is not shared with the larger rectangle (subdivided into two triangles, which is how I can tell it's not shared). This is a T-junction, something to guard against. See say this article for more explanation.

[ArnaudValensi]

Good to know. But since all the vertices are at the same height and the object is static, meaning not animated, I think the issue is limited. I've never experienced a crack visible, but if it happens, I would know what to do, thanks.

[creationix]

Isn't the cracking issue because of approximations of floats in angled lines not quite matching up? I'm assuming that since this is a grid, all the rectangular lines are integers and exact values without rounding errors of any kind. (If for some reason, you scaled/rotated the grid so that corners landed on arbitrary float positions, then you might have problems)