private Mesh CreatePreviewMesh()
{
var pointsAndQuads = splitManifold.ToIdfs();
var points = pointsAndQuads.Key;
List <int> edges = new List <int>();
var vertices = new Vector3[splitManifold.NumberOfAllocatedVertices()];
for (var i = 0; i < vertices.Length; i++)
{
vertices[i] = new Vector3((float)points[3 * i], (float)points[3 * i + 1], (float)points[3 * i + 2]);
}
int[] polygons = pointsAndQuads.Value;
List <int> polygonsFinal = new List <int>();
List <Vector3> verticesFinal = new List <Vector3>();
List <Vector3> normalsFinal = new List <Vector3>();
for (var i = 0; i < polygons.Length;)
{
int polyCount = polygons[i];
i++;
// add final vertices
int vertexBase = verticesFinal.Count;
for (int j = 0; j < polyCount; j++)
{
verticesFinal.Add(vertices[polygons[i + j]]);
}
Vector3 normal = Vector3.zero;
// triangulate polygon
for (int j = 1; j + 1 < polyCount; j++)
{
polygonsFinal.Add(vertexBase);
polygonsFinal.Add(vertexBase + j);
polygonsFinal.Add(vertexBase + j + 1);
normal += -Vector3.Cross(verticesFinal[vertexBase] - verticesFinal[vertexBase + j],
verticesFinal[vertexBase + j + 1] - verticesFinal[vertexBase + j]).normalized;
}
normal.Normalize();
for (int j = 0; j < polyCount; j++)
{
normalsFinal.Add(normal);
edges.Add(vertexBase + j);
edges.Add(vertexBase + (j + 1) % polyCount);
}
i += polyCount;
}
Mesh splitMesh = new Mesh();
splitMesh.name = "extruded";
splitMesh.SetIndices(new int[0], MeshTopology.Triangles, 0);
//splitMesh.SetIndices(new int[0], MeshTopology.Lines, 1);
splitMesh.vertices = verticesFinal.ToArray();
//splitMesh.normals = normalsFinal.ToArray();
splitMesh.subMeshCount = 2;
splitMesh.SetIndices(polygonsFinal.ToArray(), MeshTopology.Triangles, 0);
splitMesh.SetIndices(edges.ToArray(), MeshTopology.Lines, 1);
splitMesh.UploadMeshData(false);
return(splitMesh);
}