[vtkusers] A problem with rendering lines on a surface

Ken Martin ken.martin at kitware.com
Tue Jul 17 13:21:58 EDT 2018

Did you

   * Set/Get a global flag that controls whether coincident topology (e.g.,
   * line on top of a polygon) is shifted to avoid z-buffer resolution (and
   * hence rendering problems). If not off, there are two methods to choose
   * from. PolygonOffset uses graphics systems calls to shift polygons,
   * and points from each other. ShiftZBuffer is a legacy method that used
   * remap the z-buffer to distinguish vertices, lines, and polygons, but
   * does not always produce acceptable results. You should only use the
   * PolygonOffset method (or none) at this point.
  static void SetResolveCoincidentTopology(int val);
  static int  GetResolveCoincidentTopology();
  static void SetResolveCoincidentTopologyToDefault();
  static void SetResolveCoincidentTopologyToOff()
    { SetResolveCoincidentTopology(VTK_RESOLVE_OFF) ;}
  static void SetResolveCoincidentTopologyToPolygonOffset()
    { SetResolveCoincidentTopology(VTK_RESOLVE_POLYGON_OFFSET); }
  static void SetResolveCoincidentTopologyToShiftZBuffer()
    { SetResolveCoincidentTopology(VTK_RESOLVE_SHIFT_ZBUFFER); }


  mapper->SetResolveCoincidentTopologyToPolygonOffset();  ?

On Mon, Jul 16, 2018 at 9:43 PM, pnt1614 <minpu.code at gmail.com> wrote:

> Let's me describe my situation, first I pick many points and then render
> all
> cell edges around those points in different color. Everything is okay but
> when I rotate the camera, there are some edges disappeared. I am not sure
> what the problem is but it looks like a z-fighting problem. I have attached
> two images to show this problem.
> <http://vtk.1045678.n5.nabble.com/file/t342361/Image1.jpg>
> <http://vtk.1045678.n5.nabble.com/file/t342361/Image2.jpg>
> --
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Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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