don't emit an error message for every face that could not be added (due to complex elements)

src/OpenMesh/Core/IO/reader/PLYReader.cc

@@ -304,6 +304,11 @@ bool _PLYReader_::read_ascii(std::istream& _in, BaseImporter& _bi, const Options
         return false;
     }
 
+    const bool err_enabled = omerr().is_enabled();
+    size_t complex_faces = 0;
+    if (err_enabled)
+      omerr().disable();
+
     // read vertices:
     for (i = 0; i < vertexCount_ && !_in.eof(); ++i) {
         vh = _bi.add_vertex();
@@ -432,6 +437,8 @@ bool _PLYReader_::read_ascii(std::istream& _in, BaseImporter& _bi, const Options
           }
 
           fh = _bi.add_face(vhandles);
+          if (!fh.is_valid())
+            ++complex_faces;
           break;
 
         case CUSTOM_PROP:
@@ -449,6 +456,12 @@ bool _PLYReader_::read_ascii(std::istream& _in, BaseImporter& _bi, const Options
 
     }
 
+    if (err_enabled) {
+      omerr().enable();
+      if (complex_faces)
+        omerr() << complex_faces << " invalid faces could not be added.\n";
+    }
+
     // File was successfully parsed.
     return true;
 }
@@ -472,6 +485,11 @@ bool _PLYReader_::read_binary(std::istream& _in, BaseImporter& _bi, bool /*_swap
 
     _bi.reserve(vertexCount_, 3* vertexCount_ , faceCount_);
 
+    const bool err_enabled = omerr().is_enabled();
+    size_t complex_faces = 0;
+    if (err_enabled)
+      omerr().disable();
+
     // read vertices:
     for (unsigned int i = 0; i < vertexCount_ && !_in.eof(); ++i) {
         vh = _bi.add_vertex();
@@ -610,6 +628,8 @@ bool _PLYReader_::read_binary(std::istream& _in, BaseImporter& _bi, bool /*_swap
           }
 
           fh = _bi.add_face(vhandles);
+          if (!fh.is_valid())
+            ++complex_faces;
           break;
 
         case CUSTOM_PROP:
@@ -626,6 +646,12 @@ bool _PLYReader_::read_binary(std::istream& _in, BaseImporter& _bi, bool /*_swap
       }
     }
 
+    if (err_enabled) {
+      omerr().enable();
+      if (complex_faces)
+        omerr() << complex_faces << " invalid faces could not be added.\n";
+    }
+
     return true;
 }