Avoid failure of file writing if face colors or face normals are requested for...

Avoid failure of file writing if face colors or face normals are requested for PLY files. We just skip these options at this point.

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@347 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/IO/writer/PLYWriter.cc

@@ -86,8 +86,21 @@ write(const std::string& _filename, BaseExporter& _be, Options _opt) const
 
 
   // check writer features
-  if ( _opt.check(Options::FaceNormal) || _opt.check(Options::FaceColor) ) // not supported yet
-    return false;
+  if ( _opt.check(Options::FaceNormal) ) {
+    // Face normals are not supported
+    // Uncheck these options and output message that
+    // they are not written out even though they were requested
+    _opt.unset(Options::FaceNormal);
+    omerr() << "[PLYWriter] : Warning: Face normals are not supported and thus not exported! " << std::endl;
+  }
+  
+  if ( _opt.check(Options::FaceColor) ) {
+    // Face normals are not supported
+    // Uncheck these options and output message that
+    // they are not written out even though they were requested
+    _opt.unset(Options::FaceColor);
+    omerr() << "[PLYWriter] : Warning: Face colors are not supported and thus not exported! " << std::endl;
+  }
 
   options_ = _opt;