//--------------------------------------------------------------------------------------------------
public static bool ComputeAxisFromEdge(TopoDS_Face face, TopoDS_Edge edge, double parameter, out Ax1 axis)
{
axis = new Ax1();
// Get edge point and tangent
var adaptorEdge = edge.Adaptor();
var edgeFirst = adaptorEdge.FirstParameter();
var edgeLast = adaptorEdge.LastParameter();
var centerParam = parameter.Clamp(edgeFirst, edgeLast);
Pnt centerPoint = Pnt.Origin;
Vec edgeTangent = Vec.Zero;
adaptorEdge.D1(centerParam, ref centerPoint, ref edgeTangent);
if (edge.Orientation() == TopAbs_Orientation.TopAbs_REVERSED)
{
edgeTangent.Reverse();
}
// Get normal at point of edge
double first = 0, last = 0;
var curveOnSurface = BRep_Tool.CurveOnSurface(edge, face, ref first, ref last);
if (curveOnSurface == null)
{
return(false);
}
var paramNormalized = (centerParam - edgeFirst) / (edgeLast - edgeFirst);
var centerUV = curveOnSurface.Value(first + (last - first) * paramNormalized);
Vec faceNormal = Vec.Zero;
new BRepGProp_Face(face).Normal(centerUV.X, centerUV.Y, ref centerPoint, ref faceNormal);
axis = new Ax1(centerPoint, faceNormal.ToDir().Crossed(edgeTangent.ToDir()));
return(true);
}
//--------------------------------------------------------------------------------------------------
public static double CalculateBaseParameter(TopoDS_Edge edge, double normalizedParameter)
{
var adaptorEdge = edge.Adaptor();
return((adaptorEdge.FirstParameter() + adaptorEdge.LastParameter()) * 0.5);
}