diff --git a/Tree.cpp b/Tree.cpp
index ce186fa..4eeaec8 100644
--- a/Tree.cpp
+++ b/Tree.cpp
@@ -303,10 +303,10 @@ Tree::SetSurf( const SurfBezier* pSrfBz, const bool bSplitPatches, const Point3d
    double dLen2 ; pCrvV1->GetApproxLength( dLen2) ;
    double dLen3 ; pCrvU0->GetApproxLength( dLen3) ;
    m_vDim.clear() ;
-   m_vDim.push_back( ( dLen0 != 0 ? dLen0 : 1)) ;
-   m_vDim.push_back( ( dLen1 != 0 ? dLen1 : 1)) ;
-   m_vDim.push_back( ( dLen2 != 0 ? dLen2 : 1)) ;
-   m_vDim.push_back( ( dLen3 != 0 ? dLen3 : 1)) ;
+   m_vDim.push_back( ( dLen0 > EPS_ZERO ? dLen0 : 1)) ;
+   m_vDim.push_back( ( dLen1 > EPS_ZERO ? dLen1 : 1)) ;
+   m_vDim.push_back( ( dLen2 > EPS_ZERO ? dLen2 : 1)) ;
+   m_vDim.push_back( ( dLen3 > EPS_ZERO ? dLen3 : 1)) ;
 }
 
 //----------------------------------------------------------------------------