Fix normal for mesh

Normand Briere

2019-06-11 5e6a6f3319f0c4c687fe71952ac9ecc17792b83a

 timeflow/format/file/Export.java
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@@ -6,5 +6,5 @@
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 public interface Export {
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 	public String getName();
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-	public void export(TFModel model, BufferedWriter out) throws Exception;
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+	public void export(TimeflowModel model, BufferedWriter out) throws Exception;
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 }