[vtkusers] Volume Rendering with vtkUnstructuredGridRayCastMapper

[Randall Hand]

I pull it from cvs (cvs co -r VTK-5-0).

As for using the version with Paraview, i'ld love to.. But unfortunately due
to a wierd quirk with Cmake/Paraview/Irix we are unable to compile Paraview
on Irix due to problems with command lines being too long.  Also, no binary
version of paraview is offered for Irix anymore via paraview.org .  So I
have to run Paraview on Windows, but this VTK work is being done on Irix.

On 12/28/05, Dominik Szczerba <domi at vision.ee.ethz.ch> wrote:
>
> where did you get 5.0 from? I dont see it on vtk.org
> then why not try vtk that comes along with paraview?
> --domi
>
> Randall Hand wrote:
> > I don't think these classes exist in the 4.4.  Plus alot of stuff has
> > changed between 4.4 & 5.0 (This isn't CVS head, it's the 5.0 Branch
> that's
> > supposed to be pretty stable), that makes it pretty difficult for me to
> > backport.
> >
> > On 12/28/05, Dominik Szczerba <domi at vision.ee.ethz.ch> wrote:
> >
> >>Did you try with the "official" 4.4? I often have problems with the CVS
> >>version.
> >>--domi
> >>
> >>Randall Hand wrote:
> >>
> >>>I'm attempting to render an unstructured dataset that contains 1 vector
> >>>field and 7 scalar fields.  I want to map Color & Opacity to one of the
> >>
> >>1
> >>
> >>>scalar fields (both to the same one) and volume render it.  I can do
> >>
> >>this in
> >>
> >>>Paraview easily (screenie attached), but my VTK code returns a blank
> >>
> >>black
> >>
> >>>window everytime.  Am I missing something here?
> >>>
> >>>I'm doing it all offscreen on an SGI Irix box (Onyx340) with the VTK
> >>>5.0Branch installed & MangledMesa.  The code I'm using is below:
> >>>
> >>>==============================
> >>>#include <vtkColorTransferFunction.h >
> >>>#include <vtkDataSetReader.h>
> >>>#include <vtkPiecewiseFunction.h>
> >>>#include <vtkUnstructuredGridVolumeRayCastMapper.h>
> >>>#include <vtkUnstructuredGrid.h>
> >>>#include < vtkDataSet.h>
> >>>#include <vtkRenderWindow.h>
> >>>#include <vtkRenderer.h>
> >>>#include <vtkRenderLargeImage.h>
> >>>#include <vtkPNGWriter.h>
> >>>#include <vtkVolumeProperty.h>
> >>>#include <vtkDataSetTriangleFilter.h >
> >>>#include <vtkImagingFactory.h>
> >>>#include <vtkGraphicsFactory.h>
> >>>void main(void) {
> >>>    vtkGraphicsFactory *factGraphics = vtkGraphicsFactory::New();
> >>>    factGraphics->SetUseMesaClasses(1);
> >>>    factGraphics->SetOffScreenOnlyMode(1);
> >>>    factGraphics->Delete();
> >>>    vtkImagingFactory *factImage = vtkImagingFactory::New();
> >>>    factImage->SetUseMesaClasses(1);
> >>>    factImage->Delete();
> >>>    vtkDataSetReader *reader = vtkDataSetReader::New();
> >>>    reader->SetFileName("../VTK/step_127.vtk");
> >>>    reader->ReadAllScalarsOn();
> >>>
> >>>    vtkDataSetTriangleFilter *tri = vtkDataSetTriangleFilter::New();
> >>>    tri->SetInput(reader->GetOutput());
> >>>
> >>>
> >>>    vtkColorTransferFunction *color = vtkColorTransferFunction::New();
> >>>
> >>>    color->AddRGBPoint(250, 0, 0, 1);
> >>>    color->AddRGBPoint(450, 1, 0, 0);
> >>>    color->AddRGBPoint(2600, 1, 1, 0);
> >>>    color->AddRGBPoint(5000, 1, 1, 1);
> >>>
> >>>    vtkPiecewiseFunction *opacity = vtkPiecewiseFunction::New();
> >>>    opacity->AddPoint(250, 0.1);
> >>>    opacity->AddPoint(450, 0.1);
> >>>    opacity->AddPoint(2600, 0.25);
> >>>    opacity->AddPoint(5000, 1.0);
> >>>
> >>>    vtkVolumeProperty *volProp = vtkVolumeProperty::New();
> >>>    volProp->SetColor(color);
> >>>    volProp->SetScalarOpacity(opacity);
> >>>    volProp->SetInterpolationTypeToLinear();
> >>>
> >>>    vtkUnstructuredGridVolumeRayCastMapper *mapper =
> >>>            vtkUnstructuredGridVolumeRayCastMapper::New();
> >>>    mapper->SetScalarModeToUsePointFieldData();
> >>>    mapper->SelectScalarArray("Temperature");
> >>>    mapper->SetInput(tri->GetOutput());
> >>>
> >>>    vtkVolume *volume = vtkVolume::New();
> >>>    volume->SetMapper(mapper);
> >>>    volume->SetProperty(volProp);
> >>>    volume->Update();
> >>>    vtkRenderWindow *renWin = vtkRenderWindow::New();
> >>>    vtkRenderer *ren1 = vtkRenderer::New();
> >>>    renWin->OffScreenRenderingOn();
> >>>    renWin->AddRenderer(ren1);
> >>>
> >>>    ren1->AddVolume(volume);
> >>>    ren1->ResetCamera();
> >>>    renWin->SetSize(1024, 1024);
> >>>    renWin->Modified();
> >>>
> >>>    vtkRenderLargeImage *w2if = vtkRenderLargeImage::New();
> >>>    w2if->SetInput(ren1);
> >>>    w2if->SetMagnification(1);
> >>>
> >>>    vtkPNGWriter *png  = vtkPNGWriter::New();
> >>>    png->SetInput(w2if->GetOutput());
> >>>    png->SetFileName("output.png");
> >>>    png->Write();
> >>>}
> >>>===============
> >>>
> >>>
> >>>--
> >>>Randall Hand
> >>>Visualization Scientist,
> >>>ERDC-MSRC Vicksburg, MS
> >>>Homepage: http://www.yeraze.com
> >>>
> >>>
> >>>
>
> >>>------------------------------------------------------------------------
> >>>
> >>>
>
> >>>------------------------------------------------------------------------
> >>>
> >>>_______________________________________________
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> >>>Please keep messages on-topic. Check the FAQ at:
> >>
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> >>
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> >>
> >>--
> >>Dominik Szczerba, Dr.
> >>Computer Vision Lab CH-8092 Zurich
> >>http://www.vision.ee.ethz.ch/~domi
> >>
> >
> >
> >
> >
> > --
> > Randall Hand
> > Visualization Scientist,
> > ERDC-MSRC Vicksburg, MS
> > Homepage: http://www.yeraze.com
> >
>
> --
> Dominik Szczerba, Dr.
> Computer Vision Lab CH-8092 Zurich
> http://www.vision.ee.ethz.ch/~domi
>



--
Randall Hand
Visualization Scientist,
ERDC-MSRC Vicksburg, MS
Homepage: http://www.yeraze.com
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