const vector<UVPtStruct>& uv_e3 = GetUVPtStructIn( quad, 3, nbvertic - 1 );
if ( uv_e0.empty() || uv_e1.empty() || uv_e2.empty() || uv_e3.empty() )
const vector<UVPtStruct>& uv_e3 = GetUVPtStructIn( quad, 3, nbvertic - 1 );
if ( uv_e0.empty() || uv_e1.empty() || uv_e2.empty() || uv_e3.empty() )