X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;ds=sidebyside;f=vv%2FvvImageReader.cxx;h=25e235a08edb3b713b347b5a5a1147aaed7fb061;hb=ff1d5b8af965e75ecdbc1b0cbff0dad6f3b3c511;hp=d0db5988900f27531e78a4f139258c79dc1b0bd9;hpb=c4e997de4534d55cdd595b887258ab50bb9c69fd;p=clitk.git

diff --git a/vv/vvImageReader.cxx b/vv/vvImageReader.cxx
index d0db598..25e235a 100644
--- a/vv/vvImageReader.cxx
+++ b/vv/vvImageReader.cxx
@@ -166,9 +166,35 @@ void vvImageReader::ReadMatImageTransform()
     f.close();
     
     itk::Matrix<double, 4, 4> itkMat = clitk::ReadMatrix3D(filename);
+    
+    vtkSmartPointer<vtkMatrix4x4> matrix = vtkSmartPointer<vtkMatrix4x4>::New();
+    matrix->Identity();
     for(int j=0; j<4; j++)
       for(int i=0; i<4; i++)
-        mImage->GetTransform()->GetMatrix()->SetElement(j,i,itkMat[j][i]);
+        matrix->SetElement(j,i,itkMat[j][i]);
+
+    // RP: 14/03/2011
+    //  For some reason, the transformation matrix given in the MHD
+    // file is inverted wrt the transformation given in the MAT file.
+    // We don't really know where the inversion takes place inside
+    // VTK or ITK. For what we could see in VV, the transformation
+    // given in the MHD file seems "more correct" than that given in 
+    // the MAT file. For this reason, we invert the matrix read from
+    // the MAT file before concatenating it to the current transformation.
+    // Still, it would be nice to find out what happens exactly between
+    // VTK and ITK...
+    //
+    vtkSmartPointer<vtkMatrix4x4> inv_matrix = vtkSmartPointer<vtkMatrix4x4>::New();
+    if (matrix->Determinant() == 0)
+    {
+      vtkGenericWarningMacro("Matrix in " << filename.c_str() << " cannot be inverted (determinant = 0)");
+    }
+    else
+      matrix->Invert(*matrix, *inv_matrix);
+    
+    mImage->GetTransform()->PostMultiply();
+    mImage->GetTransform()->Concatenate(inv_matrix);
+    mImage->GetTransform()->Update();
   }
 }
 //------------------------------------------------------------------------------