/**
* Removes triangles that occupy the same space, and point to the same vertices.
*/
public static int[] RemoveDuplicateTriangles(this pb_Object pb)
{
pb_IntArray[] sharedIndices = pb.sharedIndices;
Vector3[] v = pb.vertices;
List <pb_Face> del = new List <pb_Face>();
int[] removedIndices;
List <pb_Face> f = new List <pb_Face>();
foreach (pb_Face face in pb.faces)
{
List <int> tris = new List <int>();
int[] ind = face.indices;
for (int i = 0; i < ind.Length; i += 3)
{
int[] s = new int[3]
{
sharedIndices.IndexOf(ind[i + 0]),
sharedIndices.IndexOf(ind[i + 1]),
sharedIndices.IndexOf(ind[i + 2])
};
float area = pb_Math.TriangleArea(v[ind[i + 0]], v[ind[i + 1]], v[ind[i + 2]]);
if ((s[0] == s[1] || s[0] == s[2] || s[1] == s[2]) || area <= 0)
{
// don't include this face in the reconstruct
;
}
else
{
tris.Add(ind[i + 0]);
tris.Add(ind[i + 1]);
tris.Add(ind[i + 2]);
}
}
if (tris.Count > 0)
{
face.SetIndices(tris.ToArray());
face.RebuildCaches();
f.Add(face);
}
else
{
del.Add(face);
}
}
pb.SetFaces(f.ToArray());
removedIndices = pb.RemoveUnusedVertices();
return(removedIndices);
}
/**
* Merge all faces into a sigle face.
*/
public static pb_Face MergeFaces(this pb_Object pb, pb_Face[] faces)
{
List <int> collectedIndices = new List <int>(faces[0].indices);
for (int i = 1; i < faces.Length; i++)
{
collectedIndices.AddRange(faces[i].indices);
}
pb_Face mergedFace = new pb_Face(collectedIndices.ToArray(),
faces[0].material,
faces[0].uv,
faces[0].smoothingGroup,
faces[0].textureGroup,
faces[0].elementGroup,
faces[0].manualUV);
pb_Face[] rebuiltFaces = new pb_Face[pb.faces.Length - faces.Length + 1];
int n = 0;
foreach (pb_Face f in pb.faces)
{
if (System.Array.IndexOf(faces, f) < 0)
{
rebuiltFaces[n++] = f;
}
}
rebuiltFaces[n] = mergedFace;
pb.SetFaces(rebuiltFaces);
// merge vertices that are on top of one another now that they share a face
Dictionary <int, int> shared = new Dictionary <int, int>();
for (int i = 0; i < mergedFace.indices.Length; i++)
{
int sharedIndex = pb.sharedIndices.IndexOf(mergedFace.indices[i]);
if (shared.ContainsKey(sharedIndex))
{
mergedFace.indices[i] = shared[sharedIndex];
}
else
{
shared.Add(sharedIndex, mergedFace.indices[i]);
}
}
pb.RemoveUnusedVertices();
return(mergedFace);
}
