[vtkusers] How To Texture Map a patch with vtkGlobeSource

Wed Nov 3 02:05:23 EDT 2010

Hi Donny,

I didn't get the time to  clean this code but it will work for you ..

I just modified a test (and hence it look bit different)

 #include <vtkGlobeSource.h>

#include <vtkPolyDataMapper.h>

#include <vtkActor.h>

#include <vtkPointData.h>

#include <vtkDoubleArray.h>

 #include "vtkBMPReader.h"

#include "vtkCamera.h"

#include "vtkGeoAlignedImageRepresentation.h"

#include "vtkGeoAlignedImageSource.h"

#include "vtkGeoEdgeStrategy.h"

#include "vtkGeoFileImageSource.h"

#include "vtkGeoFileTerrainSource.h"

#include "vtkGeoGlobeSource.h"

#include "vtkGeoProjection.h"

#include "vtkGeoProjectionSource.h"

#include "vtkGeoRandomGraphSource.h"

#include "vtkGeoSphereTransform.h"

#include "vtkGeoTerrain.h"

#include "vtkGeoTerrainNode.h"

#include "vtkGeoTerrain2D.h"

#include "vtkGeoTransform.h"

#include "vtkGeoView.h"

#include "vtkGeoView2D.h"

#include "vtkGraphLayoutView.h"

#include "vtkJPEGReader.h"

#include "vtkRegressionTestImage.h"

#include "vtkRenderedGraphRepresentation.h"

#include "vtkRenderer.h"

#include "vtkRenderWindow.h"

#include "vtkRenderWindowInteractor.h"

#include "vtkSmartPointer.h"

#include "vtkStdString.h"

#include "vtkTestUtilities.h"

#include "vtkTIFFReader.h"

#include "vtkViewTheme.h"

#include "vtkViewUpdater.h"

 #include <vtksys/SystemTools.hxx>

 #define VTK_CREATE(type,name) \

  vtkSmartPointer<type> name = vtkSmartPointer<type>::New();

 int TestGeoView(int argc, char* argv[])

{

  char* image = vtkTestUtilities::ExpandDataFileName(

    argc, argv, "Data/usa_image.jpg");

   vtkStdString imageFile = image;

   vtkSmartPointer<vtkJPEGReader> reader =

    vtkSmartPointer<vtkJPEGReader>::New();

  reader->SetFileName(imageFile.c_str());

  reader->Update();

   double latRange[]  = {24, 50};

  double longRange[] = {-126, -66};

   VTK_CREATE(vtkGlobeSource, globeSource);

  globeSource->SetStartLatitude(latRange[0]);

  globeSource->SetEndLatitude(latRange[1]);

  globeSource->SetStartLongitude(longRange[0]);

  globeSource->SetEndLongitude(longRange[1]);

   globeSource->Update();

   VTK_CREATE(vtkActor, actor);

  VTK_CREATE(vtkPolyDataMapper, mapper);

   vtkDoubleArray* newArray (vtkDoubleArray::New());

  newArray->SetNumberOfComponents(2);

   vtkDoubleArray* array =
vtkDoubleArray::SafeDownCast(globeSource->GetOutput(0)->GetPointData()->GetAbstractArray("LatLong"));

   double range[] = { (latRange[1] -latRange[0]),

                     (longRange[1] - longRange[0]) };

   double val[2];

  double newVal[2];

   for(int i=0; i < array->GetNumberOfTuples(); ++i)

    {

      array->GetTupleValue(i, val);

     newVal[1] = (val[0] - latRange[0])  / range[0];

     newVal[0] = (val[1] - longRange[1]) / range[1];

      newArray->InsertNextTuple(newVal);

    }

   globeSource->GetOutput(0)->GetPointData()->SetTCoords(newArray);

  mapper->SetInput( globeSource->GetOutput(0) );

  actor->SetMapper(mapper);

   VTK_CREATE(vtkTexture, texture);

  texture->SetInput(reader->GetOutputDataObject(0));

  actor->SetTexture(texture);

   VTK_CREATE(vtkRenderWindow, renWin);

  VTK_CREATE(vtkRenderWindowInteractor, renWinInt);

  VTK_CREATE(vtkRenderer, ren);

   ren->AddActor(actor);

   renWin->AddRenderer(ren);

  renWinInt->SetRenderWindow(renWin);

   renWin->SetSize(400,400);

  renWin->Render();

  renWinInt->Initialize();

  renWin->Render();

   int retVal = vtkRegressionTestImage( renWin );

  if( retVal == vtkRegressionTester::DO_INTERACTOR)

    {

    renWinInt->Start();

    }

   return 0;

}

Attached is the screenshot of my test..

On Tue, Nov 2, 2010 at 10:56 PM, Donny <donnyz at charter.net> wrote:

> Thanks for the help Aashish. I have attached 3 image files, one with the
> AutomaticSphereGenerationOff() set on the vtkTextureMapToSphere object and
> one with AutomaticSphereGenerationOn(). The third image is not a
> screenshot,
> it is the actual texture I am trying to map to the patch.  The only
> settings
> I set on the vtkGlobeSource are :
> gs->SetStartLatitude(24.0);
> gs->SetEndLatitude(50.0);
> gs->SetStartLongitude(-126.0);
> gs->SetEndLongitude(-66.0);
>
> As you can see the GlobeSource patch geometry is rendering as intended, but
> the texture is not appearing correctly.
>
> "you can have
>
> tx = asin(Nx)/PI  + 0.5
> ty = asin(Ny)/PI + 0.5"
>
> Is there a filter that will perform this mapping for me?
>
> Thanks.
>
> -----Original Message-----
> From: Aashish Chaudhary [mailto:aashish.chaudhary at kitware.com]
> Sent: Tuesday, November 02, 2010 10:11 AM
> To: Donny
> Cc: vtkusers at vtk.org
> Subject: Re: [vtkusers] How To Texture Map a patch with vtkGlobeSource
>
> Hi Donny,
> - Show quoted text -
> I have not used vtkTextureMapToSphere myself but can you try to
> generate your own texture coordinates? globe source does produce
> normals and in its very simplistic approach  ...
>
> you can have
>
> tx = asin(Nx)/PI  + 0.5
> ty = asin(Ny)/PI + 0.5
>
> In a shader you can do it easily.  Not sure why vtkTextureMapToSphere
> didn't work. Will find out.
>
> Can you post a snapshot?
>
> On Tue, Nov 2, 2010 at 12:01 AM, Donny <donnyz at charter.net> wrote:
> > I have created a globe patch with vtkGlobeSource for the general area of
> the
> > United States (Lat 24 to 50 Deg, Lon -126 to -66 Deg.) using
> > SetLatitudeStart, SetLatitudeEnd ... I also have a .bmp image that
> > corresponds to these extents and cannot find a filter to generate the
> > texture coordinates for this patch so I can texture it. I tried
> > vtkTextureMapToSphere and turned auto generate sphere to off but it only
> > displayed a small portion of the image onto the patch. How can I generate
> > the texture coordinates for a patch such as this?
> >
> >
> >
> > Thanks.
> >
> >
> >
> > Donny Zimmerman
> >
> >
> >
> > _______________________________________________
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> >
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>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>

-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com
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