message: Address compiler warnings.
diff: @@ -141,7 +141,7 @@ int VirtualGrid<T,NDIMS>::getIndex(const PointType & pt)
  SLIC_ASSERT(j>=0 && j<m_resolution[1]);
  if (NDIMS==3) {
  - size_t k = (pt[2] - m_origin[2])/m_step[2];
  + int k = (pt[2] - m_origin[2])/m_step[2];
  SLIC_ASSERT(k>=0 && k<m_resolution[2]);
  