public static gp_Dir ComputeNormal(this TopoDS_Face face)
{
double umin = 0, umax = 0, vmin = 0, vmax = 0;
BRepTools.UVBounds(face, ref umin, ref umax, ref vmin, ref vmax);
var surface = BRep_Tool.Surface(face);
var props = new GeomLProp_SLProps(surface, umin, vmin, 1.0, 1e-1);
return(props.Normal());
}
//--------------------------------------------------------------------------------------------------
void _AddFaceProperties(TopoDS_Face face)
{
const string facecat = "Face";
const string surfcat = "Surface";
if (Shape != null)
{
var subshapeRef = Shape.GetSubshapeReference(_TopLevelShape, face);
_AddProperty(facecat, "SubshapeRef", subshapeRef?.ToString() ?? "null");
}
_AddProperty(facecat, "Tolerance", $"{BRep_Tool.Tolerance(face)}");
_AddProperty(facecat, "Nat.Restrict.", $"{(BRep_Tool.NaturalRestriction(face) ? "Yes" : "No")}");
var props = new GProp_GProps();
BRepGProp.SurfaceProperties(BrepShape, props);
_AddProperty(facecat, "Area", $"{props.Mass()}");
var surface = BRep_Tool.Surface(face);
if (surface != null)
{
_AddProperty(surfcat, "Class", surface.GetType().Name.Replace("Geom_", ""));
double u1 = 0, u2 = 0, v1 = 0, v2 = 0;
surface.Bounds(ref u1, ref u2, ref v1, ref v2);
_AddProperty(surfcat, "Bounds U", $"({u1}, {u2})");
_AddProperty(surfcat, "Bounds V", $"({v1}, {v2})");
_AddProperty(surfcat, "Is Closed", $"U={(surface.IsUClosed() ? "Yes" : "No")} V={(surface.IsUClosed() ? "Yes" : "No")}");
if (surface.IsUPeriodic() || surface.IsVPeriodic())
{
var s = "";
if (surface.IsUPeriodic())
{
s += $"U={surface.UPeriod()} ";
}
if (surface.IsVPeriodic())
{
s += $"V={surface.VPeriod()} ";
}
_AddProperty(surfcat, "Period", s);
}
_AddProperty(surfcat, "Continuity", surface.Continuity().ToString().Replace("GeomAbs_", ""));
}
}
//--------------------------------------------------------------------------------------------------
public static Geom_Surface Surface(this TopoDS_Face face)
{
return(face == null ? null : BRep_Tool.Surface(face));
}
