Re: Problem with color and shading when rendering vtkimagedata
shadab anwar <[email protected]>
| Newsgroups | gmane.comp.lib.vtk.user |
|---|---|
| Message-ID | <CAEW39-pvc9bnea5BSbCN28R9=gqtZUddmWsbG8T_FkdGzuQEKw@mail.gmail.com> |
Hi Aron, Thanks for your reply. I am not using any specific example. I am trying to render voxels using imagedata, I have used the above code for doing so. The problem I am facing is that whenever I rotate the image after rendering I don't get proper shading and uniform coloring. Instead, I am getting above rendering results, where you can see the few voxels are shaded as black! I am not able to understand where I am going wrong. I tried changing few shading and lighting parameters but no success. I am a newbie, apology If my problem is too basic! On Wed, Dec 12, 2018 at 4:06 PM Aron Helser <[email protected]> wrote: > Can you be more specific? How do the images differ from what you expect? > Is there are particular VTK example you are following that you are trying > to change? > https://lorensen.github.io/VTKExamples/site/Cxx/ > > Aron > > On Wed, Dec 12, 2018 at 1:40 PM shadab anwar <[email protected]> > wrote: > >> Guys, >> Waiting for reply! >> >> Please help! >> >> >> >> >> On Wed, Dec 5, 2018 at 2:08 PM shadab anwar <[email protected]> >> wrote: >> >>> Hey amigos, >>> >>> VTK noob here! >>> >>> I facing a few problems while rendering vtkimagedata. The code snippet >>> as follows, >>> >>> >>> int X =4, Y=4, Z=4; >>> >>> imageData->SetDimensions(X,Y,Z); >>> >>> imageData->SetSpacing(1,1,1); >>> >>> imageData->AllocateScalars(VTK_INT,1); >>> >>> >>> >>> for (int k = 0; k < Z ; k++) >>> >>> { >>> >>> for (int j = 0; j < Y ; j++) >>> >>> { >>> >>> for (int i = 0; i < X ; i++) >>> >>> { >>> >>> int* voxel = static_cast<int*>(imageData->GetScalarPointer(i, j, k)); >>> >>> voxel[0] = 10; >>> >>> >>> } >>> >>> } >>> >>> } >>> >>> >>> for (int i=2;i!=-1;i--) >>> >>> { >>> >>> int* voxel = static_cast<int*>(imageData->GetScalarPointer(2,i,i)); >>> >>> voxel[0]=0; >>> >>> } >>> >>> >>> mapper->SetBlendModeToComposite(); >>> >>> mapper->SetRequestedRenderModeToRayCast(); >>> >>> mapper->SetInputData(imageData); >>> >>> compositeOpacity->AddPoint(10,1); >>> >>> color->AddRGBPoint(10,1,0,0); >>> >>> compositeOpacity->AddPoint(0,0); >>> >>> color->AddRGBPoint(0,0,0, 0); >>> >>> volumeProperty->SetAmbient(0.3); >>> >>> volumeProperty->SetDiffuse(0.4); >>> >>> volumeProperty->SetSpecular(0.8); >>> >>> volumeProperty->SetInterpolationType(0); >>> >>> volumeProperty->ShadeOn(); >>> >>> volumeProperty->SetColor(color); >>> >>> volumeProperty->SetScalarOpacity(compositeOpacity); >>> >>> renderer->SetBackground(0.5, 0.5, 0.5); >>> >>> volume->SetMapper(mapper); >>> >>> volume->SetProperty(volumeProperty); >>> >>> renderer->AddViewProp(volume); >>> >>> I am getting the below results, >>> >>> >>> [image: image for forum.jpg] [image: image for forum2.jpg] >>> [image: image for forum3.jpg] >>> >>> >>> It can be seen that everytime I rotate my image I don't get a proper >>> shading and color for the object. I have tried changing the lightining >>> properties and shading properties but no sucess. >>> >>> I would be really thankful if anyone could help me. >>> >>> >>> Just for your information I am mechanical engineering with a bit of programming knowledge, so if my question is irrattional please forgive me. >>> >>> >>> >>> >>> Best, >>> >>> Shadab >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >> Powered by www.kitware.com >> >> Visit other Kitware open-source projects at >> http://www.kitware.com/opensource/opensource.html >> >> Please keep messages on-topic and check the VTK FAQ at: >> http://www.vtk.org/Wiki/VTK_FAQ >> >> Search the list archives at: http://markmail.org/search/?q=vtkusers >> >> Follow this link to subscribe/unsubscribe: >> https://public.kitware.com/mailman/listinfo/vtkusers >> > _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the VTK FAQ at: http://www.vtk.org/Wiki/VTK_FAQ Search the list archives at: http://markmail.org/search/?q=vtkusers Follow this link to subscribe/unsubscribe: https://public.kitware.com/mailman/listinfo/vtkusers