Fix ZIP issue

Normand Briere

2019-06-09 989407a46041b80c71fd906bff6b97528e6f3350

 LA.java
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@@ -88,6 +88,9 @@
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     static void vecCopy(cVector a, cVector b)
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     {
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+        Grafreed.Assert (a != null);
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+        assert (b != null);
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+        
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         b.x = a.x;
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         b.y = a.y;
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         b.z = a.z;
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@@ -307,6 +310,7 @@
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         }
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+        // Last row should always be 0 0 0 1
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         Grafreed.Assert(Math.abs(src[0][3]) <= 1E-15);
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         Grafreed.Assert(Math.abs(src[1][3]) <= 1E-15);
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         Grafreed.Assert(Math.abs(src[2][3]) <= 1E-15);