[vtkusers] vtkFastSplatter broken?

[mbcx9rb9]

Hi all,

I was hoping to use vtkFastSplatter so I took a look at the test. However,
it doesn't work how I expected (or how it should, I think).

The example places 5 splatters at various coordinates. But I can't control
the position of those splats. If I comment out all but the first splat and
then change the coordinates, it doesn't move!

Below is the relevant code, can someone confirm that if they change point[0]
and point[1], nothing happens? Then, try adding in a second splat (remember
to change Points->SetNumberOfPoints( 1 ) to 2), changing its coordinates and
observe that weird things start happening...


/*
 * Copyright 2004 Sandia Corporation.
 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
 * license for use of this work by or on behalf of the
 * U.S. Government. Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that this Notice and any
 * statement of authorship are reproduced on all copies.
 */

// Simple test of vtkFastSplatter

#include "vtkImageData.h"
#include "vtkImageShiftScale.h"
#include "vtkFastSplatter.h"
#include "vtkImageViewer2.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"

#include "vtkSmartPointer.h"
#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

#include <math.h>

const int SPLAT_IMAGE_SIZE = 100;

int main(int, char *[])
{
  // For the purposes of this example we'll build the splat image by
  // hand.

  VTK_CREATE(vtkImageData, SplatImage);
  SplatImage->SetDimensions(SPLAT_IMAGE_SIZE, SPLAT_IMAGE_SIZE, 1);
  SplatImage->AllocateScalars(VTK_FLOAT, 1);

  for (int i = 0; i < SPLAT_IMAGE_SIZE; ++i)
    {
    for (int j = 0; j < SPLAT_IMAGE_SIZE; ++j)
      {
      double xCoord = 1 - fabs(  (i - SPLAT_IMAGE_SIZE/2)
                               / (SPLAT_IMAGE_SIZE/2.0) );
      double yCoord = 1 - fabs(  (j - SPLAT_IMAGE_SIZE/2)
                               / (SPLAT_IMAGE_SIZE/2.0) );

      SplatImage->SetScalarComponentFromDouble(i, j, 0, 0,
                                               xCoord * yCoord );
      }
    }

  VTK_CREATE(vtkPolyData, SplatPoints);
  VTK_CREATE(vtkPoints, Points);

  Points->SetNumberOfPoints( 1 );
  double point[3];

  point[0] = 0;
  point[1] = 0;
  point[2] = 0;
  Points->SetPoint( 0, point );
/*
  point[0] = 1;
  point[1] = 0;
  point[2] = 0;
  Points->SetPoint( 1, point );

  point[0] = -1;
  point[1] = 1;
  point[2] = 0;
  Points->SetPoint( 2, point );

  point[0] = 1;
  point[1] = -1;
  point[2] = 0;
  Points->SetPoint( 3, point );

  point[0] = -1;
  point[1] = -1;
  point[2] = 0;
  Points->SetPoint( 4, point );
*/
  SplatPoints->SetPoints(Points);

  VTK_CREATE(vtkFastSplatter, splatter);
  splatter->SetInputData( SplatPoints );
  splatter->SetOutputDimensions( 2*SPLAT_IMAGE_SIZE,
                                 2*SPLAT_IMAGE_SIZE,
                                 1 );
  splatter->SetInputData(1, SplatImage );

  // The image viewers and writers are only happy with unsigned char
  // images.  This will convert the floats into that format.
  VTK_CREATE(vtkImageShiftScale, resultScale);
  resultScale->SetOutputScalarTypeToUnsignedChar();
  resultScale->SetShift(0);
  resultScale->SetScale(255);
  resultScale->SetInputConnection( splatter->GetOutputPort() );

  splatter->Update();
  resultScale->Update();

  // Set up a viewer for the image.  vtkImageViewer and
  // vtkImageViewer2 are convenient wrappers around vtkActor2D,
  // vtkImageMapper, vtkRenderer, and vtkRenderWindow.  All you need
  // to supply is the interactor and hooray, Bob's your uncle.
  VTK_CREATE(vtkImageViewer2, ImageViewer);
  ImageViewer->SetInputConnection( resultScale->GetOutputPort() );
  ImageViewer->SetColorLevel(127);
  ImageViewer->SetColorWindow(255);

  VTK_CREATE(vtkRenderWindowInteractor, iren);
  ImageViewer->SetupInteractor(iren);

  ImageViewer->Render();
  ImageViewer->GetRenderer()->ResetCamera();

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

  return EXIT_SUCCESS;
}




--
View this message in context: http://vtk.1045678.n5.nabble.com/vtkFastSplatter-broken-tp5735566.html
Sent from the VTK - Users mailing list archive at Nabble.com.