/// <summary>
/// Extrude a Polyon.
/// </summary>
/// <param name="perimeter">The Polygon to extrude.</param>
/// <param name="voids">A collection of Polygons representing voids in the extrusion.</param>
/// <param name="height">The height of the extrusion.</param>
/// <param name="capped">A flag indicating whether the extrusion should be capped.</param>
/// <returns></returns>
public static Mesh Extrude(Polygon perimeter, double height, IList <Polygon> voids = null, bool capped = true)
{
var mesh = new Hypar.Geometry.Mesh();
var perimeters = new List <Polygon>();
perimeters.Add(perimeter);
if (voids != null)
{
perimeters.AddRange(voids);
}
foreach (var boundary in perimeters)
{
var verts = boundary.Vertices;
for (var i = 0; i < verts.Count; i++)
{
Vector3 a;
Vector3 b;
if (i == verts.Count - 1)
{
a = verts[i];
b = verts[0];
}
else
{
a = verts[i];
b = verts[i + 1];
}
var v1 = new Vector3(a.X, a.Y, 0.0);
var v2 = new Vector3(b.X, b.Y, 0.0);
var v3 = new Vector3(b.X, b.Y, height);
var v4 = new Vector3(a.X, a.Y, height);
mesh.AddQuad(new [] { v1, v2, v3, v4 });
}
}
if (capped)
{
mesh.AddTesselatedFace(perimeter, voids, new Transform());
mesh.AddTesselatedFace(perimeter, voids, new Transform(new Vector3(0, 0, height)), true);
}
return(mesh);
}
/// <summary>
/// Create a ruled loft between sections.
/// </summary>
/// <param name="sections"></param>
public static Mesh Loft(IList <Polygon> sections)
{
var mesh = new Hypar.Geometry.Mesh();
for (var i = 0; i < sections.Count; i++)
{
var p1 = sections[i];
var p2 = i == sections.Count - 1 ? sections[0] : sections[i + 1];
for (var j = 0; j < p1.Vertices.Count; j++)
{
var j1 = j == p1.Vertices.Count - 1 ? 0 : j + 1;
var v1 = p1.Vertices[j];
var v2 = p1.Vertices[j1];
var v3 = p2.Vertices[j1];
var v4 = p2.Vertices[j];
mesh.AddQuad(new [] { v1, v2, v3, v4 });
}
}
return(mesh);
}