[vtkusers] need help about vtkBMPReader

[med ali]

hi David,
 
thanks for this example 
 
this example work for one array but i want  do that for many arrays of bmp images  
because after  i will pass the output to  the vtkImageMarchingCubes .
 
how can i do this without using vtkBMPReader.
 
regards 
dali
 

 

/////////////////////////////////////////////////////// the code  ///////////////////////////////////////////

vtkBMPReader *bmpreader=vtkBMPReader ::New();

bmpreader->SetFilePrefix (prefix);

bmpreader->SetFileNameSliceOffset(1);

bmpreader->SetFilePattern("%s%d.bmp");

bmpreader->SetDataExtent(0,width, 0,height, 0, 31); 

//319 -( width-1, 239 - (height-1), 10 - (no of bitmaps-1)

bmpreader->SetDataSpacing(1,1,interslices);

 

//marchingcubes

vtkImageMarchingCubes *MC=vtkImageMarchingCubes ::New();

MC->SetInput(bmpreader->GetOutput());

MC->SetValue(0,iso-value);

MC->GetOutput()->Update();

 

////////////////////////////////  ///////////////////////////////////////////////////////


David Cole <david.cole at kitware.com> a écrit :
Please keep questions/replies on the list in case somebody else has time to respond sooner. (Next time, keep cc'ing vtkusers at vtk.org...)

Here's a small example that builds a vtkImageData from raw r,g,b values and shows it in a render window. It's an adaptation and reduction of VTK/Examples/Tutorial/Step6/Cxx/Cone6.cxx. I've eliminated the cone source/mapper/actor and added a vtkImageData and vtkImageActor.

The important pieces of the puzzle are SetScalarTypeToUnsignedChar and SetNumberOfScalarComponents(3). Then you can fill in the r,g,b values to your liking in a loop after allocating the scalars. If you already have a bitmap allocated and filled in, there's probably a way for you to set that data in as the scalar data here as long as it is laid out properly: r, g, b sequentially for each pixel as shown here. I'll let somebody else who's done that before chime in if you need more help. :-)

//====================<SampleCode>====================
#include "vtkImageActor.h"
#include "vtkImageData.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"

int main()
{
  vtkImageData *imageData = vtkImageData::New();
  imageData->SetScalarTypeToUnsignedChar();
  imageData->SetNumberOfScalarComponents(3);
  imageData->SetDimensions(16, 16, 1);
  imageData->AllocateScalars();

  int i = 0;
  int j = 0;
  unsigned char r = 0;
  unsigned char g = 0;
  unsigned char b = 0;
  unsigned char *data = (unsigned char *) imageData->GetScalarPointer();
  for (i= 0; i<16; ++i)
  for (j= 0; j<16; ++j)
  {
    //    Checkerboard test pattern with red, green, blue and black quadrants:
    if ((j+i) % 2)
    {
      r= g= b= 0;
    
      if (i>7 && j>7)
      {
        r= 255;
      }
      else if (i>7)
      {
        b= 255;
      }
      else if (j>7)
      {
        g= 255;
      }
    }
    else
    {
      //  White on the "other" part of the checkerboard:
      r= g= b= 255;
    
      //  Grayscale ramp:
      //r= g= b= 16*i + j;
    }

    *data++ = r;
    *data++ = g;
    *data++ = b;
  }

  vtkImageActor *imageActor = vtkImageActor::New();
  imageActor->SetInput(imageData);
  imageActor->InterpolateOff();

  vtkRenderer *ren1= vtkRenderer::New();
  ren1->AddActor( imageActor );
  ren1->SetBackground( 0.1, 0.2, 0.4 );

  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer( ren1 );
  renWin->SetSize( 300, 300 );

  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  vtkInteractorStyleTrackballCamera *style = vtkInteractorStyleTrackballCamera::New();
  iren->SetInteractorStyle(style);

  iren->Initialize();
  iren->Start();

  imageActor->Delete();
  imageData->Delete();
  ren1->Delete();
  renWin->Delete();
  iren->Delete();
  style->Delete();

  return 0;
}
//====================</SampleCode>====================


Hope this helps you get a little further,
David



med ali wrote: Hi,
 
thanks you,
but i 'am begginer in vtk 
can you give me a short example that i can begin with .
 
thanks,
 
dali

David Cole <david.cole at kitware.com> a écrit :
The output of vtkBMPReader (which is derived from vtkImageAlgorithm) is a vtkImageData. Just construct a vtkImageData directly from your data with the correct dimensions, scalar type and underlying data rather than using vtkBMPReader.

med ali wrote: 
Hi all,

 

i want use vtkBMPReader  but  not directly on the files 

 instead of passing the prefix of slices  can i pass the array data  of pixels  to vtkBMPReader

/* 

bmp= vtkBMPReader::New();

bmp->SetFilePrefix (prefix);

bmp->SetFileNameSliceOffset(1);

bmp->SetFilePattern("%s%d.bmp");

*/


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