[vtkusers] Problem with color and shading when rendering vtkimagedata

[Aron Helser]

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 <sk.shadabanwar at gmail.com>
wrote:

> 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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