[vtkusers] Represent Grid as Points

[Müller, Jan]

My goal is to visualise the points (and only the points) of a grid as points and i found no other way then converting the grid into vtkPoints.

________________________________
Von: Dan Lipsa <dan.lipsa at kitware.com>
Gesendet: Montag, 14. August 2017 23:41
An: Müller, Jan
Cc: vtkusers at vtk.org
Betreff: Re: [vtkusers] Represent Grid as Points

Why do you need a vtkPoints? In the example it is only used to create the points. For a uniform grid (or image data) the points are not stored but infered from origin and spacing so you should not need them at least for making something similar with the example work.

Dan


On Mon, Aug 14, 2017 at 4:49 PM, Müller, Jan <J.Mueller at vr.rwth-aachen.de<mailto:J.Mueller at vr.rwth-aachen.de>> wrote:

This:
https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/ColoredPoints/
Plus:
 vtkSmartPointer<vtkUniformGrid> grid = vtkSmartPointer<vtkUniformGrid>::New();
  grid->SetDimensions(xsize, ysize, zsize);

  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
  for (int i = 0; i < grid->GetNumberOfPoints(); ++i) {
    points->InsertNextPoint(grid->GetPoint(i));
  }
is pretty much what i do at the moment, I wonder if there is a way to get the Points out of a grid without iterating through the whole grid and copying every single point it contains.
Thanks for your help?


________________________________
Von: Bill Lorensen <bill.lorensen at gmail.com<mailto:bill.lorensen at gmail.com>>
Gesendet: Montag, 14. August 2017 19:34
An: Dan Lipsa; Müller, Jan
Cc: vtkusers at vtk.org<mailto:vtkusers at vtk.org>
Betreff: Re: [vtkusers] Represent Grid as Points

Or https://lorensen.github.io/VTKExamples/site/Cxx/Visualization/Glyph3DMapper

On Mon, Aug 14, 2017 at 11:57 AM Dan Lipsa <dan.lipsa at kitware.com<mailto:dan.lipsa at kitware.com>> wrote:
Does this help?
https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/ColoredPoints/

On Mon, Aug 14, 2017 at 9:57 AM, Müller, Jan <J.Mueller at vr.rwth-aachen.de<mailto:J.Mueller at vr.rwth-aachen.de>> wrote:

Hi All,

I am new to VTK and I have trouble visualising just the points of a "vtkUniformGrid". I create a grid and attach Scalars to its points. So far so good but when it comes to visualising the points of the grid im having problems.


I found "SetRepresentationToPoints"sadly  this only visualises the surface of my Grid but i want ALL points of the grid.

The next promising thing I found is "vtkVertexGlyphFilter" but I didnt manage to find a comfortable way of connecting my Grid to it , without creating "vtkPolyData" by iterating through all points of the grid one by one.


I am pretty sure there must be an easy way to visualise a Grid as Points but im unable to find it.
Any help is very much appreciated!

Greetings
Jan


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