[vtkusers] Re: Mesa / VTK problems

[Dave Reed]

I don't know tcl, but here's a simple C++ example (for VTK4.0) that
shows the problem if anyone wants to convert it.

#include <string>
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkVolume16Reader.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkOutlineFilter.h"
#include "vtkCamera.h"
#include "vtkContourFilter.h"
#include <vtkStripper.h>

#include "SaveImage.h"

int main( int argc, char *argv[] )
{
  char *c = getenv("VTK_DATA");
  string vtk_data;
  if (c != NULL) {
    vtk_data = string(c);
  }
  else {
    vtk_data = "";
  }
  string filename = vtk_data + string("/headsq/quarter");
    
    
  // create the renderer stuff
  vtkRenderer *aRenderer = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer(aRenderer);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);
  
  // read the volume
  vtkVolume16Reader *v16 = vtkVolume16Reader::New();
  v16->SetDataDimensions(64,64);
  v16->SetDataByteOrderToLittleEndian();
  v16->SetFilePrefix (filename.c_str());
  v16->SetImageRange(1, 93);
  v16->SetDataSpacing (3.2, 3.2, 1.5);
  
  // extract the skin
  vtkContourFilter *skinExtractor = vtkContourFilter::New();
  skinExtractor->SetInput(v16->GetOutput());
  skinExtractor->SetValue(0, 500);

  vtkStripper *stripper = vtkStripper::New();
  stripper->SetInput(skinExtractor->GetOutput());

  vtkPolyDataMapper *skinMapper = vtkPolyDataMapper::New();
  skinMapper->SetInput(stripper->GetOutput());
  skinMapper->ScalarVisibilityOff();
  skinMapper->ImmediateModeRenderingOn();
  vtkActor *skin = vtkActor::New();
  skin->SetMapper(skinMapper);
  
  // get an outline
  vtkOutlineFilter *outlineData = vtkOutlineFilter::New();
  outlineData->SetInput(v16->GetOutput());
  vtkPolyDataMapper *mapOutline = vtkPolyDataMapper::New();
  mapOutline->ImmediateModeRenderingOn();
  mapOutline->SetInput(outlineData->GetOutput());
  vtkActor *outline = vtkActor::New();
  outline->SetMapper(mapOutline);
  outline->GetProperty()->SetColor(0,0,0);
  
  // create a camera with the correct view up
  vtkCamera *aCamera = vtkCamera::New();
  aCamera->SetViewUp (0, 0, -1);
  aCamera->SetPosition (0, 1, 0);
  aCamera->SetFocalPoint (0, 0, 0);
  aCamera->ComputeViewPlaneNormal();
  
  // now, tell the renderer our actors
  aRenderer->AddActor(outline);
  aRenderer->AddActor(skin);
  aRenderer->SetActiveCamera(aCamera);
  aRenderer->ResetCamera ();
  aCamera->Dolly(1.5);
  aRenderer->SetBackground(1,1,1);
  aRenderer->ResetCameraClippingRange();
  
  // interact with data
  renWin->SetSize( 300, 300);
  renWin->Render();
  
  iren->Start(); 
}

Dave



> X-Sender: billlist at pop.nycap.rr.com
> From: "William A. Hoffman" <billlist at nycap.rr.com>
> 
> Can someone check in a tcl script that shows this problem as a VTK test?
> We run a nightly build of both VTK and Mesa from cvs.   Right now all the 
> tests are
> passing.
> 
> -Bill
> 
> 
> At 12:42 PM 11/21/2001 -0700, Brian Paul wrote:
> >Prabhu Ramachandran wrote:
> > >
> > > >>>>> "BP" == Brian Paul <brian_e_paul at yahoo.com> writes:
> >
> > > This will show you missing polygons above the lip and below the nose.
> > >
> > > I also see random disappearance of actors
> >
> >What is an "actor"?
> >
> >
> > > at times with some of my
> > > Python scripts but am unable to replicate it.  Will let you know when
> > > I am able to get a repeatable error.
> > >
> > >     BP> I'm building from the vtk32-src-unix.tgz source archive but I
> > >     BP> have no idea where to get the (non-RPM) "data files" from.
> > >
> > > Go to http://public.kitware.com/VTK/get-software.php and grab the data
> > > files there the files are of the form:  vtk20data.part*
> >
> >Is there a mirror ftp from which I can get these files?  The kitware
> >ftp site has been _really_ slow (1KB/s).
> >
> >-Brian
> >
> >Do You Yahoo!?
> >Get your free @yahoo.com address at http://mail.yahoo.com
> >
> >Please keep messages on-topic. Check the FAQ at: 
> ><http://public.kitware.com/cgi-bin/vtkfaq>
> 
> 
>