Add color array to vtkImageData C++

Question

I'm newbie at VTK and I'm trying to understand the basics.

Let's suppose that I need to display three dimensional structured data (vtkImageData) which has: nx = 10, ny = 10, nz = 10 where nx/ny/nz - number of points along each dimension. For each point (x,y,z) I have a value val(x,y,z). So the color of each node is defined by the val. As I know in C++ I would write:

int main(int argc, char *argv[])
{
// Create an image data
vtkSmartPointer<vtkImageData> imageData =
  vtkSmartPointer<vtkImageData>::New();

// Specify the size of the image data
int nx = 10;
int ny = 10;
int nz = 10;
imageData->SetDimensions(nx,ny,nz);
imageData->SetSpacing(1.0, 1.0, 1.0);
imageData->SetOrigin(0.0, 0.0, 0.0); 

double val[1000];
for (int i = 0; i < 1000; i++){
    data[i] = i;
}

// after that I need to set val-array as color for imageData object

return 0;
}

How to set val[1000] array to imageData so the color of each node to be defined by the val? P.S. I've seen some examples from VTK web site but still didn't solve the problem

Best regards,

kerim

Answer 1

int main(int argc, char *argv[])
{
// Create an image data
vtkNew<vtkImageData> imageData;

// Specify the size of the image data
int nx = 10;
int ny = 10;
int nz = 10;
imageData->SetDimensions(nx,ny,nz);
imageData->SetSpacing(1.0, 1.0, 1.0);
imageData->SetOrigin(0.0, 0.0, 0.0); 

vtkNew<vtkDoubleArray> array;
array->SetName("Name");
double val[1000];
for (int i = 0; i < 1000; i++){
    array->InsertNextValue(i);
}

image->GetPointData()->AddArray(array);

return 0;
}