public static Mesh Stitch(Polygons bottomLoop, double bottomHeight, Polygons topLoop, double topHeight, double scaling = 1000)
{
// only a bottom
if (bottomLoop?.Count > 0 &&
(topLoop == null || topLoop.Count == 0))
{
// if there is no top than we need to create a top
return(CreateTop(bottomLoop, bottomHeight, scaling));
}
// only a top
if ((bottomLoop == null || bottomLoop.Count == 0) &&
topLoop.Count > 0)
{
// if there is no bottom than we need to create bottom
return(CreateBottom(topLoop, topHeight, scaling));
}
// simple bottom and top
if (bottomLoop.Count == 1 &&
topLoop.Count == 1 &&
bottomLoop[0].Count == topLoop[0].Count)
{
var mesh = CreateSimpleWall(bottomLoop[0], bottomHeight * 1000, topLoop[0], topHeight * 1000);
mesh.Transform(Matrix4X4.CreateScale(1 / scaling));
return(mesh);
}
var all = new Polygons();
all.AddRange(bottomLoop);
all.AddRange(topLoop);
all = all.GetCorrectedWinding();
var bevelLoop = all.CreateVertexStorage().TriangulateFaces();
for (var i = 0; i < bevelLoop.Vertices.Count; i++)
{
bevelLoop.Vertices[i] = bevelLoop.Vertices[i] + new Vector3Float(0, 0, 16);
}
return(bevelLoop);
}
public static Mesh Extrude(this IVertexSource vertexSource, double zHeight)
{
Polygons polygons = vertexSource.CreatePolygons();
// ensure good winding and consistent shapes
polygons = polygons.GetCorrectedWinding();
// convert the data back to PathStorage
vertexSource = polygons.CreateVertexStorage();
CachedTesselator teselatedSource = new CachedTesselator();
Mesh mesh = vertexSource.TriangulateFaces(teselatedSource);
int numIndicies = teselatedSource.IndicesCache.Count;
mesh.Translate(new Vector3(0, 0, zHeight));
// then the outside edge
for (int i = 0; i < numIndicies; i += 3)
{
Vector2 v0 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 0].Index].Position;
Vector2 v1 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 1].Index].Position;
Vector2 v2 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 2].Index].Position;
if (v0 == v1 || v1 == v2 || v2 == v0)
{
continue;
}
var bottomVertex0 = new Vector3(v0, 0);
var bottomVertex1 = new Vector3(v1, 0);
var bottomVertex2 = new Vector3(v2, 0);
var topVertex0 = new Vector3(v0, zHeight);
var topVertex1 = new Vector3(v1, zHeight);
var topVertex2 = new Vector3(v2, zHeight);
if (teselatedSource.IndicesCache[i + 0].IsEdge)
{
mesh.CreateFace(new Vector3[] { bottomVertex0, bottomVertex1, topVertex1, topVertex0 });
}
if (teselatedSource.IndicesCache[i + 1].IsEdge)
{
mesh.CreateFace(new Vector3[] { bottomVertex1, bottomVertex2, topVertex2, topVertex1 });
}
if (teselatedSource.IndicesCache[i + 2].IsEdge)
{
mesh.CreateFace(new Vector3[] { bottomVertex2, bottomVertex0, topVertex0, topVertex2 });
}
}
// then the bottom
for (int i = 0; i < numIndicies; i += 3)
{
Vector2 v0 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 0].Index].Position;
Vector2 v1 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 1].Index].Position;
Vector2 v2 = teselatedSource.VerticesCache[teselatedSource.IndicesCache[i + 2].Index].Position;
if (v0 == v1 || v1 == v2 || v2 == v0)
{
continue;
}
mesh.CreateFace(new Vector3[] { new Vector3(v2, 0), new Vector3(v1, 0), new Vector3(v0, 0) });
}
mesh.CleanAndMerge();
return(mesh);
}
