/// <summary>
/// Extends a polygon to a 3 dimensional solid.
/// Makes a copy of the polygon shifted over by the extrusion vector, then connects corresponding vertices.
/// </summary>
public Polyhedron Extrude(FreeVector extrusionVector)
{
if (this.IsParallelTo(extrusionVector))
{
throw new Exception("Extrusion vector cannot be parallel to extruding face");
}
if (extrusionVector.ScalarProjection(NormalDirection).AbsoluteValue() < Inches.Tolerance * Inches)
{
throw new Exception("Extrusion vector is too small in the normal direction.");
}
;
var baseFace = extrusionVector.ScalarProjection(NormalDirection) < ZeroDistance
? this
: this.ReverseOrientation();
var faces = new List <Polygon> {
baseFace
};
var oppositeFace = new List <LineSegment>();
foreach (var segment in baseFace.Edges)
{
var opposite = segment.Translate(extrusionVector);
var sideFace = new Polygon
(
ValidateOption.Dont,
opposite.BasePoint,
opposite.EndPoint,
segment.EndPoint,
segment.BasePoint
);
faces.Add(sideFace);
oppositeFace.Add(opposite.Reverse());
}
oppositeFace.Reverse();
faces.Add(new Polygon(oppositeFace, ValidateOption.Dont));
var solid = new Polyhedron(faces, ValidateOption.Dont);
return(solid);
}
/// <summary> /// Returns whether ot not this line itnersects the Polyhedron /// </summary> public bool Intersects(Polyhedron polyhedron) => polyhedron.Faces.Any(Intersects);