[Interest] Plain rendering

[Igor Mironchik]

Hi,

I defined geometry of the leaf as two plains with very small thickness. 
Top has 8 faces, bottom - 8, lefts side 8 and right side 8. Total 9*2 
vertices. Top vertices has Z = 0.0, bottom Z = -0.01. But when leaf is 
rendered it looks a little convex.

Is it normal, or am I missed something?

Look at the picture...Tree

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