public static MeshGeometryModel3D Create3DPolygon(List <Vector2> points, float height, Material material)
{
MeshBuilder builder = new MeshBuilder();
if (points.Count < 3)
{
return(null);
}
// Create poly now to indicate winding order
Polygon_Poly2Tri upPolygon = new Polygon_Poly2Tri(
points: points.Select(point => new PolygonPoint(point.X, point.Y)));
List <Vector2> pointByClockwise =
upPolygon.WindingOrder == Point2DList.WindingOrderType.AntiClockwise
? points.AsEnumerable().Reverse().ToList()
: points;
// Adding walls
Vector3 firstUpPoint = pointByClockwise.First().AddZ(height);
Vector3 firstDownPoint = pointByClockwise.First().AddZ(0);
Vector3 lastUpPoint = firstUpPoint;
Vector3 lastDownPoint = firstDownPoint;
for (int i = 1; i < pointByClockwise.Count; i++)
{
Vector3 currentUpPoint = pointByClockwise[i].AddZ(height);
Vector3 currentDownPoint = pointByClockwise[i].AddZ(0);
builder.AddQuad(
currentDownPoint.Map(),
lastDownPoint.Map(),
lastUpPoint.Map(),
currentUpPoint.Map());
lastUpPoint = currentUpPoint;
lastDownPoint = currentDownPoint;
}
// Create cycle
builder.AddQuad(
firstDownPoint.Map(),
lastDownPoint.Map(),
lastUpPoint.Map(),
firstUpPoint.Map());
// Adding Upper Part
P2T.Triangulate(upPolygon);
foreach (var trianglePoints in upPolygon.Triangles.Select(x => x.Points))
{
builder.AddTriangle(
p0: new Vector3_SharpDX((float)trianglePoints.Item0.X, (float)trianglePoints.Item0.Y, height),
p1: new Vector3_SharpDX((float)trianglePoints.Item1.X, (float)trianglePoints.Item1.Y, height),
p2: new Vector3_SharpDX((float)trianglePoints.Item2.X, (float)trianglePoints.Item2.Y, height));
}
MeshGeometry3D polyWall = builder.ToMesh();
MeshGeometryModel3D element = new MeshGeometryModel3D()
{
Geometry = polyWall,
Material = material
};
return(element);
}
