Fix L&F nimbus too slow.

Normand Briere

2019-08-17 5892f05411c3d4dce2d8a59e0966dc2e1843a971

 Grid.java
..
..
@@ -67,6 +67,11 @@
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         return 1;
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     }
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+    double vFlip(double v)
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+    {
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+        return 1-v;
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+    }
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+    
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     Vertex biparamFunction(double u, double v)
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     {
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         Vertex temp = new Vertex((2*v-1)*radius*4, 0 /*-radius,*/, (2*u-1)*radius*4);