vtkVolumeTextureMapper3D::UpdateVolumes(...) calls Modified() method too early

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

The calls to: this->SavedTextureInput = input; this->SavedTextureMTime.Modified();

should be placed at the end of the method instead of the begining, because at line 1103: input->GetPointData()->GetScalars()->GetRange(scalarRange, components-1); will modify the input->GetMTime() return value, so if we enter again in UpdateVolumes() the computations will be done without need of it.

This is needed since revision 1.80 of vtkDataArray.cxx because the method vtkDataArray::ComputeRange modify the MTime, wich was not the case before.