Replace/restore buttons.

Normand Briere

2019-07-17 a5580a47d246c1272b10adba68070f6e13da5e41

 Face.java
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@@ -31,6 +31,8 @@
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     //cVector norm;
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     //short flags;
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+    transient boolean used;
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+    
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     transient float weight; // face weight using normals if leaf or maximum of all recursive elements
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     transient int good; // vertex links broken
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     transient int boundary;