message: Lowers epsilon in primal::intersect test between triangles and ray/segments.
  This epsilon is used to determine if the unnormalized barycentric coordinates
  of the intersection between a triangle and ray/segment are near zero.
  If so, it triggers an AXOM_CHECK().
diff: @@ -188,7 +188,7 @@ bool intersect(const Triangle< T, 3 >& tri, const Ray< T,3 >& ray,
  if(retval)
  {
  - const double EPS = 1e-6;
  + const double EPS = 1e-12;
  double normalizer = p[0] + p[1] + p[2];
  SLIC_CHECK_MSG(
  std::abs(normalizer) > EPS,
  @@ -252,7 +252,7 @@ bool intersect(const Triangle< T, 3 >& tri, const Segment< T,3 >& seg,
  if(retval)
  {
  - const double EPS = 1e-6;
  + const double EPS = 1e-12;
  double normalizer = p[0] + p[1] + p[2];
  SLIC_CHECK_MSG(
  std::abs(normalizer) > EPS,
  