public static Mesh TriangulateFaces(IVertexSource vertexSource)
{
vertexSource.rewind();
CachedTesselator teselatedSource = new CachedTesselator();
Graphics2DOpenGL.SendShapeToTesselator(teselatedSource, vertexSource);
Mesh extrudedVertexSource = new Mesh();
int numIndicies = teselatedSource.IndicesCache.Count;
// build the top first so it will render first when we are translucent
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;
}
Vertex topVertex0 = extrudedVertexSource.CreateVertex(new Vector3(v0, 0));
Vertex topVertex1 = extrudedVertexSource.CreateVertex(new Vector3(v1, 0));
Vertex topVertex2 = extrudedVertexSource.CreateVertex(new Vector3(v2, 0));
extrudedVertexSource.CreateFace(new Vertex[] { topVertex0, topVertex1, topVertex2 });
}
return extrudedVertexSource;
}
public static Mesh Extrude(IVertexSource vertexSource, double zHeight)
{
vertexSource.rewind();
CachedTesselator teselatedSource = new CachedTesselator();
Graphics2DOpenGL.SendShapeToTesselator(teselatedSource, vertexSource);
Mesh extrudedVertexSource = new Mesh();
int numIndicies = teselatedSource.IndicesCache.Count;
// build the top first so it will render first when we are translucent
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;
}
Vertex topVertex0 = extrudedVertexSource.CreateVertex(new Vector3(v0, zHeight));
Vertex topVertex1 = extrudedVertexSource.CreateVertex(new Vector3(v1, zHeight));
Vertex topVertex2 = extrudedVertexSource.CreateVertex(new Vector3(v2, zHeight));
extrudedVertexSource.CreateFace(new Vertex[] { topVertex0, topVertex1, topVertex2 });
}
// 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;
}
Vertex bottomVertex0 = extrudedVertexSource.CreateVertex(new Vector3(v0, 0));
Vertex bottomVertex1 = extrudedVertexSource.CreateVertex(new Vector3(v1, 0));
Vertex bottomVertex2 = extrudedVertexSource.CreateVertex(new Vector3(v2, 0));
Vertex topVertex0 = extrudedVertexSource.CreateVertex(new Vector3(v0, zHeight));
Vertex topVertex1 = extrudedVertexSource.CreateVertex(new Vector3(v1, zHeight));
Vertex topVertex2 = extrudedVertexSource.CreateVertex(new Vector3(v2, zHeight));
if (teselatedSource.IndicesCache[i + 0].IsEdge)
{
extrudedVertexSource.CreateFace(new Vertex[] { bottomVertex0, bottomVertex1, topVertex1, topVertex0 });
}
if (teselatedSource.IndicesCache[i + 1].IsEdge)
{
extrudedVertexSource.CreateFace(new Vertex[] { bottomVertex1, bottomVertex2, topVertex2, topVertex1 });
}
if (teselatedSource.IndicesCache[i + 2].IsEdge)
{
extrudedVertexSource.CreateFace(new Vertex[] { 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;
}
Vertex bottomVertex0 = extrudedVertexSource.CreateVertex(new Vector3(v0, 0));
Vertex bottomVertex1 = extrudedVertexSource.CreateVertex(new Vector3(v1, 0));
Vertex bottomVertex2 = extrudedVertexSource.CreateVertex(new Vector3(v2, 0));
extrudedVertexSource.CreateFace(new Vertex[] { bottomVertex2, bottomVertex1, bottomVertex0 });
}
return(extrudedVertexSource);
}
