[vtkusers] Problem with color and shading when rendering vtkimagedata

[shadab anwar]

Guys,
Waiting for reply!

Please help!




On Wed, Dec 5, 2018 at 2:08 PM shadab anwar <sk.shadabanwar at gmail.com>
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
>
>
>
>
>
>
>
>
>
>
>
>
>
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