private void AppearanceChanged()
{
var y0 = 0d;
var wallBuilder = new MeshBuilder(false, false);
for (int i = 0; i < this.Stories; i++)
{
if (i > 0 && this.FloorThickness > 0)
{
wallBuilder.AddBox(new Point3D(0, 0, y0 + this.FloorThickness / 2), this.Length + 0.2, this.Width + 0.2, this.FloorThickness);
y0 += this.FloorThickness;
}
wallBuilder.AddBox(new Point3D(0, 0, y0 + this.StoryHeight / 2), this.Length, this.Width, this.StoryHeight);
y0 += this.StoryHeight;
}
var theta = Math.PI / 180 * this.RoofAngle;
var roofBuilder = new MeshBuilder(false, false);
var y1 = y0 + Math.Tan(theta) * this.Width / 2;
var p0 = new Point(0, y1);
var p1 = new Point(this.Width / 2 + 0.2 * Math.Cos(theta), y0 - 0.2 * Math.Sin(theta));
var p2 = new Point(p1.X + this.RoofThickness * Math.Sin(theta), p1.Y + this.RoofThickness * Math.Cos(theta));
var p3 = new Point(0, y1 + this.RoofThickness / Math.Cos(theta));
var p4 = new Point(-p2.X, p2.Y);
var p5 = new Point(-p1.X, p1.Y);
var roofSection = new[] { p0, p1, p1, p2, p2, p3, p3, p4, p4, p5, p5, p0 };
roofBuilder.AddExtrudedSegments(roofSection, new Vector3D(0, -1, 0), new Point3D(-this.Length / 2, 0, 0), new Point3D(this.Length / 2, 0, 0));
var cap = new[] { p0, p1, p2, p3, p4, p5 };
roofBuilder.AddPolygon(cap, new Vector3D(0, -1, 0), new Vector3D(0, 0, 1), new Point3D(-this.Length / 2, 0, 0));
roofBuilder.AddPolygon(cap, new Vector3D(0, 1, 0), new Vector3D(0, 0, 1), new Point3D(this.Length / 2, 0, 0));
var p6 = new Point(this.Width / 2, y0);
var p7 = new Point(-this.Width / 2, y0);
wallBuilder.AddPolygon(new[] { p0, p6, p7 }, new Vector3D(0, -1, 0), new Vector3D(0, 0, 1), new Point3D(-this.Length / 2, 0, 0));
wallBuilder.AddPolygon(new[] { p0, p6, p7 }, new Vector3D(0, 1, 0), new Vector3D(0, 0, 1), new Point3D(this.Length / 2, 0, 0));
this.walls.Geometry = wallBuilder.ToMesh(true);
this.roof.Geometry = roofBuilder.ToMesh(true);
}
