[vtkusers] Volume Rendering help

[Sean McInerney]

Hi Sentil,

   First off, know that you will never see your Volume 'vol' rendered
unless you add it to your Renderer 'ren' ;-)

(i.e. ren->AddProp(vol);)

   Next, if you will be simultaneously displaying the isosurface of the
cylinder data ('act'), you will need to call
IntermixIntersectingGeometryOn from your VolumeRayCastMapper 'rmap'.

(i.e. rmap->IntermixIntersectingGeometryOn();)

   You may still have to adjust your color and opacity transfer
functions to achieve your expected results. Check out the
vtkVolumeRayCastMapper Examples and Tests for guidance.

-Sean

Sentil Balaji wrote:
> Hey,
> 
>    I am trying to render a cylinder from its circular
> section planes stored as .bmp files.When I render it I
> get a hollow cylinder instead of a  solid one.I have
> the code below ,does it ring a bell in anyones' smart
> brain.If so, please help me out...Many Thanks....
> **********************CODE******************************
> #include<VTK4.4/vtkBMPReader.h>
> #include<VTK4.4/vtkRenderWindow.h>
> #include<VTK4.4/vtkRenderer.h>
> #include<VTK4.4/vtkRenderWindowInteractor.h>
> #include<VTK4.4/vtkPolyDataNormals.h>
> #include<VTK4.4/vtkContourFilter.h>
> #include<VTK4.4/vtkPolyDataMapper.H>
> #include<VTK4.4/vtkActor.H>
> #include<VTK4.4/vtkPolyData.h>
> #include<VTK4.4/vtkImageData.h>
> #include<VTK4.4/vtkOutlineFilter.h>
> #include<VTK4.4/vtkVolumeRayCastMapper.h>
> #include<VTK4.4/vtkVolumeRayCastCompositeFunction.h>
> #include<VTK4.4/vtkVolume.h>
> #include<VTK4.4/vtkDelaunay3D.h>
> #include<VTK4.4/vtkDataSetMapper.h>
> 
> void main()
> {
> 	vtkBMPReader *br=vtkBMPReader::New();
> 	vtkRenderWindow *win=vtkRenderWindow::New();
> 	vtkRenderer *ren=vtkRenderer::New();
> 	vtkRenderWindowInteractor
> *it=vtkRenderWindowInteractor::New();
> 	vtkPolyDataNormals *pnorm=vtkPolyDataNormals::New();
> 	vtkPolyDataMapper *pmap=vtkPolyDataMapper::New();
> 	vtkContourFilter *cfilter=vtkContourFilter::New();
> 	vtkOutlineFilter *ofilter=vtkOutlineFilter::New();
> 	vtkVolumeRayCastMapper
> *rmap=vtkVolumeRayCastMapper::New();
> 	vtkVolumeRayCastCompositeFunction
> *rcomp=vtkVolumeRayCastCompositeFunction::New();
> 	vtkVolume *vol=vtkVolume::New();
> 	vtkActor *act=vtkActor::New();
> 	vtkDelaunay3D *del=vtkDelaunay3D::New();
> 	vtkDataSetMapper *dsm=vtkDataSetMapper::New();
> 	win->AddRenderer(ren);
> 	it->SetRenderWindow(win);
> 	br->SetDataExtent(1,256,1,256,1,50);
> 	br->SetFilePrefix("D:/DATA/d");
> 	br->SetFilePattern("%s%d.bmp");
> 	cfilter->SetInput(br->GetOutput());
> 	cfilter->SetValue(255,255);
> 	pnorm->SetInput(cfilter->GetOutput());
> 	pnorm->SetFeatureAngle(5.0);
> 	dsm->SetInput((vtkDataSet*)br->GetOutput());
> 	pmap->SetInput(cfilter->GetOutput());
> 	act->SetMapper(pmap);
> 	ren->AddActor(act);
> 	win->Render();
> 	it->Start();
> }
> *******************************************************
> 
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