[vtkusers] ActiViz Points of Polydata in mm or pixels?

[Matias Montroull]

I guess I will answer the question myself...

The points are in millimeters (mm) and relative to the origin (0,0).

Regards,

Matias.


On Fri, Jan 17, 2014 at 10:34 AM, Matias Montroull <matimontg at gmail.com>wrote:

> Hi,
>
> I've extracted points out of my polydata this way:
> My question is:
> are these points in mm? pixels?
>
> here's a sample of what I got:
>
>  150.5861 120.1173 7.200073  151.172 120.1173 7.164073  151.172 120.0168
> 7.200073  151.7579 120.1173 7.146607  151.7579 119.9575 7.200073  152.3439
> 120.1173 7.123975  152.3439 119.8792 7.200073  152.9298 120.1173 7.107765
> 152.9298 119.8332 7.200073
>
>   vtkContourFilter skinextractor = vtkContourFilter.New();
>             skinextractor.SetInputConnection(readerdicom.GetOutputPort());
>             skinextractor.SetValue(0, -800);
>
>             vtkPolyDataConnectivityFilter contornos = new
> vtkPolyDataConnectivityFilter();
>             contornos.SetInputConnection(skinextractor.GetOutputPort());
>             contornos.SetExtractionModeToLargestRegion();
>             contornos.SetColorRegions(1);
>
>             vtkCleanPolyData removepoints = new vtkCleanPolyData();
>             removepoints.SetInput(contornos.GetOutput());
>             removepoints.Update();
>
>             vtkPolyDataNormals skinnormals = vtkPolyDataNormals.New();
>
> //skinnormals.SetInputConnection(skinextractor.GetOutputPort());
>             skinnormals.SetInputConnection(removepoints.GetOutputPort());
>             skinnormals.SetFeatureAngle(90.0);
>             skinnormals.ComputePointNormalsOn();
>
>             vtkPolyData polys = new vtkPolyData();
>             polys = skinnormals.GetOutput();
>             polys.Update();
>
>
>
>             //polys.BuildCells();
>             int numberofpoints = polys.GetNumberOfPoints();
>
>             for (int i = 0; i < polys.GetNumberOfPoints(); i ++)
>             {
>                 double[] p = new double[3];
>                 p = polys.GetPoint(i);
>                 POI poi_mesh_individual = new POI();
>                 poi_mesh_individual.POI_x = Convert.ToDecimal(p[0]);
>                 poi_mesh_individual.POI_y = Convert.ToDecimal(p[1]);
>                 poi_mesh_individual.POI_z = Convert.ToDecimal(p[2]);
>                 POIs_3D.Add(poi_mesh_individual);
>             }
>
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