Fix physics UI

Normand Briere

2019-08-06 b3ae4e889872ca0b9ca76f1d17b2f0b961226729

 Blob.java
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@@ -82,6 +82,7 @@
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     void retile()
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     {
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+                new Exception().printStackTrace();
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         System.exit(0);
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 		ClearList();
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         bRep = (new ImplicitTiler(this, ImplicitTiler.SURFACEID, true, true, true, cellSize, cellSize, tolerance, true)).bRep;