[vtkusers] How to create an image from scratch in memory in VTK

[Steve M. Robbins]

On Fri, Dec 09, 2005 at 10:26:46AM -0800, Deepak Roy wrote:
> hello,
>   Does anyone know how to create an image from scratch in memory in VTK.
>   I tried this and many other things but it doesnt work.....
>    
>   **************************************************************************************************
>   vtkImageData *pZImage = vtkImageData::New();
>   pZImage->SetDimensions( wx , wy , 1 );
>   pZImage->SetOrigin( 0 , 0 , 0 );
>   pZImage->SetSpacing( 1 , 1 , 1 );
>   pZImage->SetScalarTypeToUnsignedChar();
>   pZImage->SetNumberOfScalarComponents( 1 );
>   pZImage->AllocateScalars();

My observation is that you need to add:

    pZImage->SetWholeExtent( 0, wx-1, 0, wy-1, 0, 0 );

>    
>   vtkUnsignedCharArray *pScalars = (vtkUnsignedCharArray *) pZImage->GetPointData()->GetScalars();
>    
>   
> for( int i = 0 ; i < wx ; i++ )
>   {
>     for( int j = 0 ; j < wy ; j++ )
>   {
>     int index = i * j;

Um ... that's not the correct formula for index.

Regards,
-Steve