[vtkusers] problem with texture mapping

[Ankur Deshmukh]

I have a couple of questions on texture mapping. I have a program which 
lets the user select a specified area on the volumetric data. I want to 
map  certain texture in that area.

1. How do I go about mapping this texture? If any one can send me a 
piece of code  it would be greatly helpful.

I have a snippet of code which I had even posted earlier. The error of 
running this program is a segmentation fault. Can anyone tell me whats 
wrong with this code.

Any Help is highly appreciated

CODE:

  //Extracting the skin

  vtkContourFilter *skinExtractor = vtkContourFilter::New();
    skinExtractor->SetInput(imageData);
    skinExtractor->SetValue(0, 500);
  vtkPolyDataNormals *skinNormals = vtkPolyDataNormals::New();
    skinNormals->SetInput(skinExtractor->GetOutput());
    skinNormals->SetFeatureAngle(60.0);
  vtkStripper *skinStripper = vtkStripper::New();
    skinStripper->SetInput(skinNormals->GetOutput());
  vtkPolyDataMapper *skinMapper = vtkPolyDataMapper::New();
    skinMapper->SetInput(skinStripper->GetOutput());
    skinMapper->ScalarVisibilityOff();
  vtkActor *skin = vtkActor::New();
    skin->SetMapper(skinMapper);
    skin->GetProperty()->SetDiffuseColor(1, .49, .25);
    skin->GetProperty()->SetSpecular(.3);
    skin->GetProperty()->SetSpecularPower(20);
    skin->GetProperty()->SetOpacity(1.0);

  // Extracting the bones

//  vtkContourFilter *boneExtractor = vtkContourFilter::New();
    boneExtractor->SetInput(imageData);
    boneExtractor->SetValue(0, 1150);
  vtkPolyDataNormals *boneNormals = vtkPolyDataNormals::New();
    boneNormals->SetInput(boneExtractor->GetOutput());
    boneNormals->SetFeatureAngle(60.0);
  vtkStripper *boneStripper = vtkStripper::New();
    boneStripper->SetInput(boneNormals->GetOutput());
  vtkPolyDataMapper *boneMapper = vtkPolyDataMapper::New();
    boneMapper->SetInput(boneStripper->GetOutput());
    boneMapper->ScalarVisibilityOff();
  vtkActor *bone = vtkActor::New();
    bone->SetMapper(boneMapper);
    bone->GetProperty()->SetDiffuseColor(1, 1, .9412);

  /// An outline provides context around the data./
  ////
  vtkOutlineFilter *outlineData = vtkOutlineFilter::New();
    outlineData->SetInput(imageData);
  vtkPolyDataMapper *mapOutline = vtkPolyDataMapper::New();
    mapOutline->SetInput(outlineData->GetOutput());
  vtkActor *outline = vtkActor::New();
    outline->SetMapper(mapOutline);
    outline->GetProperty()->SetColor(0,0,0);
 	

//Texture mapping data

vtkTextureMapToPlane *texturePlane = vtkTextureMapToPlane::New();
texturePlane->SetInput((vtkDataSet *)skinNormals->GetOutput());
 		
vtkTransformTextureCoords *transformTexture = vtkTransformTextureCoords::New();
transformTexture->SetInput(texturePlane->GetOutput());
 	
vtkPolyDataMapper *textureDataMapper = vtkPolyDataMapper::New();
textureDataMapper->SetInput((vtkPolyData *)texturePlane->GetOutput());
 	
vtkImageReader2Factory *createReader = vtkImageReader2Factory::New();
vtkImageReader2 *textureReader = vtkImageReader2::New();
textureReader = createReader->CreateImageReader2(argv[4]);
textureReader->SetFileName(argv[4]);
		 	
vtkTexture *texture = vtkTexture::New();
texture->SetInput(textureReader->GetOutput());
texture->InterpolateOn();
		
vtkActor *textureActor = vtkActor::New();
textureActor->SetMapper(textureDataMapper);
textureActor->SetTexture(texture);