Create polycurve from multiple Curve[] loops

Developers
, , ,
1

Hi All,

I am working on a method to create multiple closed polycurves when the OffsetMany method returns multiple Curve[] loops. I’m having trouble determining the correct implementation in the else-if block. I would appreciate any assistance.

Thank you!

@jacob.small @chuongmep

        /// <summary>
        /// Offset a planar surface and round the edges if required.
        /// </summary>
        /// <param name="surface">The surface input.</param>
        /// <param name="offsetDistance">The perimeter offset distance.</param>
        /// <param name="concaveFillet">The fillet radius at the concave corner.</param>
        /// <param name="convexFillet">The fillet radius at the convex corner.</param>
        /// <returns>The offset surface.</returns>
        /// <exception cref="Exception"></exception>
        public static Surface OffsetSurface(
            Surface surface,
            float offsetDistance,
            float concaveFillet = 0,
            float convexFillet = 0)
        {
            // Check if the surface is planar and horizontal.
            Surface _surface = CheckSurfacePlanarity(surface);

            // Get the surface perimeter curve.
            PolyCurve perimeterCurve = SurfacePerimeter(_surface);

            // Offset the perimeter curve.
            List<PolyCurve> joinedCurves = new List<PolyCurve>();
            //try
            //{
                Curve[] offsetCurves = perimeterCurve.OffsetMany(offsetDistance, SurfacePlane(_surface).Normal);

                // Check if offset many creates one curve loop.
                if (offsetCurves.Length == 1)
                {
                    PolyCurve placeHolderCurve = PolyCurve.ByJoinedCurves(offsetCurves, 0.001, false, 0);

                    // Check if the area of the offset curve is greater than that of the original surface.
                    if (Surface.ByPatch(placeHolderCurve).Area > surface.Area)
                    {
                        Curve[] offsetCurvesAlt = perimeterCurve.OffsetMany(-offsetDistance, SurfacePlane(_surface).Normal);
                        placeHolderCurve = PolyCurve.ByJoinedCurves(offsetCurvesAlt, 0.001, false, 0);
                    }
                    joinedCurves.Add(placeHolderCurve);
                }
                // Check if offset many creates more than one curve loop.
                else if (offsetCurves.Length > 1)
                {
                    List<Curve[]> newCurves = new List<Curve[]>();
                    newCurves.Add(offsetCurves);
                    foreach (Curve[] curve in newCurves)
                    {
                        PolyCurve placeHolderCurve = PolyCurve.ByJoinedCurves(curve, 0.001, false, 0);
                        joinedCurves.Add(placeHolderCurve);
                    }
                }
            //}
            //catch (Exception ex)
            //{
                //throw new Exception("The surface cannot be offset. Reduce the offset distance.", ex);
            //}

            // Round the concave corners of the offset curves.
            List<PolyCurve> concaveRoundedCurves = new List<PolyCurve>();
            foreach (PolyCurve curve in joinedCurves)
            {
                if (concaveFillet > 0)
                {
                    try
                    {
                        concaveRoundedCurves.Add(curve.Fillet(concaveFillet, false));
                    }
                    catch
                    {
                        concaveRoundedCurves.Add(curve);
                    }
                }
                else
                {
                    concaveRoundedCurves.Add(curve);
                }
            }

            // Round the convex corners of the concave rounded curves.
            List<PolyCurve> convexRoundedCurves = new List<PolyCurve>();
            foreach (PolyCurve curve in concaveRoundedCurves)
            {
                if (convexFillet > 0)
                {
                    try
                    {
                        convexRoundedCurves.Add(curve.Fillet(convexFillet, true));
                    }
                    catch
                    {
                        convexRoundedCurves.Add(curve);
                    }
                }
                else
                {
                    convexRoundedCurves.Add(curve);
                }
            }

            // Create surfaces from the curve loops.
            List<Surface> offsetSurfaces = new List<Surface>();
            foreach (PolyCurve curve in convexRoundedCurves)
            {
                offsetSurfaces.Add(Surface.ByPatch(curve));
            }

            // Join the surfaces into a single surface.
            Surface finalSurface = Surface.ByUnion(offsetSurfaces);

            return finalSurface;
        }
2

Can you show a geometry condition in a sketch form? If memory serves PolyCurve.OffsetMany returns closed PolyCurves.

3

Hi Jacob

Thanks for the response.
Please see the sketch below.

image
image724×1060 3.82 KB

Here is a JSON string of the surface

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,\"d5a8b66e-1f24-47a8-812a-1f9bff1a47fd\": {\"typeid\": \"autodesk.soliddef:vertex-1.0.0\",\"Float64\": {\"precision\": 0},\"String\": {\"geometry\": \"08f039de-5de3-4614-a8be-1ef63f45aa7b\"}} ,\"e234d341-f6c7-41b6-ae61-ecad76c3b909\": {\"typeid\": \"autodesk.soliddef:vertex-1.0.0\",\"Float64\": {\"precision\": 0},\"String\": {\"geometry\": \"9479028a-5493-4013-ba7d-afe3efcc510c\"}} }}}}} "

4

Edited that post to make the Jason string a bit easier.

When you offset this in such a way as to generate multiple polycurves, are you not retrieving them as such? I guess I am lost by the difference between what the OOTB node and the desired output is in terms of the data.

5

Thanks for the guidance Jacob.
Here is the solution.

/// <summary>
/// Create planar offset polycurve edges from a surface and fillet the corners if required.
/// </summary>
/// <param name="surface">The surface input.</param>
/// <param name="offsetDistance">The perimeter offset distance.</param>
/// <param name="concaveFillet">The fillet radius at the concave corner.</param>
/// <param name="convexFillet">The fillet radius at the convex corner.</param>
/// <returns>The offset surface polycurves.</returns>
/// <exception cref="Exception"></exception>
public static List<PolyCurve> CreateOffsetSurfaceEdges(
    Surface surface, 
    float offsetDistance, 
    float concaveFillet = 0, 
    float convexFillet = 0)
{
    // Check if the surface is planar and horizontal.
    Surface _surface = CheckSurfacePlanarity(surface);

    // Get the surface perimeter curve.
    PolyCurve perimeterCurve = SurfacePerimeter(_surface);

    // offset the perimeter curve.
    Curve[] offsetCurves = perimeterCurve.OffsetMany(offsetDistance, SurfacePlane(_surface).Normal);

    // Offset the perimeter curve.
    List<PolyCurve> joinedCurves = new List<PolyCurve>();
    try
    {
        // Check if the area of the offset curve is greater than that of the original surface.
        foreach (Curve curve in offsetCurves)
        {
            if (Surface.ByPatch(curve).Area > _surface.Area)
            {
                Curve[] offsetCurvesAlt = perimeterCurve.OffsetMany(-offsetDistance, SurfacePlane(surface).Normal);
                foreach (Curve curveAlt in offsetCurvesAlt)
                {
                    joinedCurves.Add(curveAlt as PolyCurve);
                }
            }
            else
            {
                joinedCurves.Add(curve as PolyCurve);
            }
        }
    }
    catch 
    {
        throw new Exception("The surface cannot be offset. Reduce the offset distance.");
    }
    // Round the concave corners of the offset curves.
    List<PolyCurve> concaveRoundedCurves = new List<PolyCurve>();
    foreach (PolyCurve curve in joinedCurves)
    {
        if (concaveFillet > 0)
        {
            try
            {
                concaveRoundedCurves.Add(curve.Fillet(concaveFillet, false));
            }
            catch
            {
                concaveRoundedCurves.Add(curve);
            }
        }
        else
        {
            concaveRoundedCurves.Add(curve);
        }
    }

    // Round the convex corners of the concave rounded curves.
    List<PolyCurve> convexRoundedCurves = new List<PolyCurve>();
    foreach (PolyCurve curve in concaveRoundedCurves)
    {
        if (convexFillet > 0)
        {
            try
            {
                convexRoundedCurves.Add(curve.Fillet(convexFillet, true));
            }
            catch
            {
                convexRoundedCurves.Add(curve);
            }
        }
        else
        {
            convexRoundedCurves.Add(curve);
        }
    }

    return convexRoundedCurves;
}
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