ParaView Loop Subdivision
The Loop Subdivision filter uses the VTK filter vtkLoopSubdivisionFilter. The filter can interactively subdivide each triangle into multiple triangles (up to four). The input to this filter must be triangles. Otherwise an error will occur stating that the filter "only operates on triangles, but this data set has no triangles to operate on." To ensure triangulation of the input data set, the user can utilize the Triangulate filter. New points are created so that the output surface is smooth.
- First the user selects the data they wish to operate on from the Selection Window. It will be highlighted when this occurs.
- The user can then select Filter->Alphabetical->Loop Subdivision from the main menu.
- The user can input the Number of subdivisions.
- The Apply button must be pressed before the output will be generated.
Interesting results can appear from using this filter, so use it with care. As an example, create a plane from the Source menu. Triangulate the plane, and feed the result into the Loop Subdivision filter. The output is a circular plane (or a disk), not a square plane. This occurs when the input plane is only one quadrilateral (triangulated into two triangles). Increasing the resolution of the initial plane will improve the results.