/// <summary>
/// Create Brep
/// </summary>
protected Brep CreateBrep(List <Point3d> points, double height, double tolerance)
{
if (points.Count < 4 || height <= 0.0)
{
return(null);
}
// Create the profile curve
var profile = new PolylineCurve(points);
if (!profile.IsClosed || !profile.IsPlanar(tolerance))
{
return(null);
}
// Create a surface by extruding the profile curve
var surface = Surface.CreateExtrusion(profile, new Vector3d(0.0, 0.0, height));
if (null == surface)
{
return(null);
}
// Create a Brep from the surface
var brep = surface.ToBrep();
// The profile curve is a degree=1 curve. Thus, the extruded surface will
// have kinks. Because kinked surface can cause problems down stream, Rhino
// always splits kinked surfaces when adding Breps to the document. Since
// we are not adding this Brep to the document, lets split the kinked
// surfaces ourself.
brep.Faces.SplitKinkyFaces(RhinoMath.DefaultAngleTolerance, true);
// Cap any planar holes
var capped_brep = brep.CapPlanarHoles(tolerance);
if (null == capped_brep)
{
return(null);
}
// The profile curve, created by the input points, is oriented clockwise.
// Thus when the profile is extruded, the resulting surface will have its
// normals pointed inwards. So lets check the orientation and, if inwards,
// flip the face normals.
if (BrepSolidOrientation.Inward == capped_brep.SolidOrientation)
{
capped_brep.Flip();
}
string log;
if (!capped_brep.IsValidWithLog(out log))
{
RhinoApp.WriteLine(log);
return(null);
}
return(capped_brep);
}
/// <summary>
/// Verifies a PolylineCurve is a rectangle
/// </summary>
public static bool IsRectangle(PolylineCurve curve)
{
// Curve should be a valid, closed, planar polyline curve with 5 points
if (curve == null || !curve.IsValid || !curve.IsClosed || !curve.IsPlanar() || curve.PointCount != 5)
{
return(false);
}
// Angle between each segment should be 90 degrees
const double angle = 90.0 * (Math.PI / 180.0);
for (var i = 1; i < curve.PointCount - 1; i++)
{
var p0 = curve.Point(i - 1);
var p1 = curve.Point(i);
var p2 = curve.Point(i + 1);
var v0 = p1 - p0;
v0.Unitize();
var v1 = p1 - p2;
v1.Unitize();
var a = Vector3d.VectorAngle(v0, v1);
if (Math.Abs(angle - a) >= RhinoMath.DefaultAngleTolerance)
{
return(false);
}
}
return(true);
}