First checkin for OpenMesh 2.0

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@2 fdac6126-5c0c-442c-9429-916003d36597

Doc/Examples/draw_normals.cc

@@ -0,0 +1,14 @@
+#include <OpenMesh/Core/Utils/GenProg.hh>
+
+// draw a face normal if we have one
+void drawFaceNormal(const MyMesh::Face& _f) { 
+  drawFaceNormal(_f, GenProg::Bool2Type<OM_Check_Attrib(MyMesh::Face, Normal)>()); 
+}
+
+// normal exists -> use it
+void drawFaceNormal(const MyMesh::Face& _f, GenProg::Bool2Type<true>) { 
+  glNormal3fv(_f.normal());
+}
+
+// empty dummy (no normals)
+void drawFaceNormal(const MyMesh::Face& _f, GenProg::Bool2Type<false>){}