The VTK library loads vertex colors in PLY files as RGB. Added that to the polymesh loader.

git-svn-id: svn+ssh://svn.pointclouds.org/pcl/trunk@3268 a9d63959-f2ad-4865-b262-bf0e56cfafb6

io/src/vtk_lib_io.cpp

@@ -257,9 +257,12 @@ pcl::io::vtk2mesh(const vtkSmartPointer<vtkPolyData>& poly_data, pcl::PolygonMes
     poly_colors = vtkUnsignedCharArray::SafeDownCast(poly_data->GetPointData()->GetScalars("Colors"));
 
   // some applications do not save the name of scalars (including PCL's native vtk_io)
-  if (!poly_colors)
+  if (!poly_colors && poly_data->GetPointData() != NULL )
     poly_colors = vtkUnsignedCharArray::SafeDownCast(poly_data->GetPointData()->GetScalars("scalars"));
 
+  if (!poly_colors && poly_data->GetPointData() != NULL )
+    poly_colors = vtkUnsignedCharArray::SafeDownCast(poly_data->GetPointData()->GetScalars("RGB"));
+
   // TODO: currently only handles rgb values with 3 components
   if (poly_colors && (poly_colors->GetNumberOfComponents() == 3))
   {