Hi guys,

I  use the following codes to retrieve the edges:

m_face_ptr->IGetFirstLoop(&loop_ptr);

loop_ptr->GetEdgeCount(&pEdgeCount);

CComPtr *pEdgeList  =new CComPtr[pEdgeCount];

loop_ptr->IGetEdges((IEdge **) pEdgeList);

then for each edge,:

// get curve parameter
CComPtr crv_ptr = NULL;
edge_ptr->IGetCurve(&crv_ptr);

double start_param = 0, end_param = 0;

double param_arr[32];
edge_ptr->IGetCurveParams2(param_arr);
start_param = param_arr[6];
end_param = param_arr[7];

PackedData packed_data;
packed_data.doubleValue = param_arr[10];
int sense = packed_data.intValues[1];
if(sense == 0)
{
  double tmp = start_param * (-1.0);
  start_param = end_param * (-1.0);
  end_param = tmp;
}

double delta = end_param - start_param;
delta *= 0.01;

for( int i = 0; i <= 100; i++)
{
  double t = start_param + delta * i;
  double arr[14];
  crv_ptr->IEvaluate2( t, 0, arr);

  *** print arr[0], arr[1], arr[2] (local codes) *****
}

Now the problem:

I print all the data:arr[0], arr[1], arr[2] returned from crv_ptr->IEvaluate2(t, 0, arr);

The printed loop doesn't match to the face edge. Only the first edge is matched to the edge of the face,
all other edges are not correct.

My guess that the start and end parameters for the curve of the edge are not correct, but review my own hundred times,
I didnt' find anything wrong.

I know the codes are long, but it is quite simple and quite straightforwad.

Could the anyone or board moderator help me?

thank you very much.

john