/**
* Creates a new mesh using only the @src positions, normals, and a new color array.
*/
public static Mesh CreateOverlayMesh(z_Mesh src)
{
Mesh m = new Mesh();
m.name = "Overlay Mesh: " + src.name;
m.vertices = src.vertices;
m.normals = src.normals;
m.colors = z_Util.Fill <Color>(new Color(0f, 0f, 0f, 0f), m.vertexCount);
m.subMeshCount = src.subMeshCount;
for (int i = 0; i < src.subMeshCount; i++)
{
if (src.GetTopology(i) == MeshTopology.Triangles)
{
int[] tris = src.GetIndices(i);
int[] lines = new int[tris.Length * 2];
int index = 0;
for (int n = 0; n < tris.Length; n += 3)
{
lines[index++] = tris[n + 0];
lines[index++] = tris[n + 1];
lines[index++] = tris[n + 1];
lines[index++] = tris[n + 2];
lines[index++] = tris[n + 2];
lines[index++] = tris[n + 0];
}
m.SetIndices(lines, MeshTopology.Lines, i);
}
else
{
m.SetIndices(src.GetIndices(i), src.GetTopology(i), i);
}
}
return(m);
}
/**
* Returns a dictionary where each z_Edge is mapped to a list of triangle indices that share that edge.
* To translate triangle list to vertex indices, multiply by 3 and take those indices (ex, triangles[index+{0,1,2}])
*/
public static Dictionary <z_Edge, List <int> > GetAdjacentTriangles(z_Mesh m)
{
int len = m.GetTriangles().Length;
if (len % 3 != 0 || len / 3 == m.vertexCount)
{
return(new Dictionary <z_Edge, List <int> >());
}
Dictionary <z_Edge, List <int> > lookup = null;
// @todo - should add some checks to make sure triangle structure hasn't changed
if (adjacentTrianglesCache.TryGetValue(m, out lookup))
{
return(lookup);
}
int smc = m.subMeshCount;
lookup = new Dictionary <z_Edge, List <int> >();
List <int> connections;
for (int n = 0; n < smc; n++)
{
int[] tris = m.GetIndices(n);
for (int i = 0; i < tris.Length; i += 3)
{
int index = i / 3;
z_Edge a = new z_Edge(tris[i], tris[i + 1]);
z_Edge b = new z_Edge(tris[i + 1], tris[i + 2]);
z_Edge c = new z_Edge(tris[i + 2], tris[i]);
if (lookup.TryGetValue(a, out connections))
{
connections.Add(index);
}
else
{
lookup.Add(a, new List <int>()
{
index
});
}
if (lookup.TryGetValue(b, out connections))
{
connections.Add(index);
}
else
{
lookup.Add(b, new List <int>()
{
index
});
}
if (lookup.TryGetValue(c, out connections))
{
connections.Add(index);
}
else
{
lookup.Add(c, new List <int>()
{
index
});
}
}
}
adjacentTrianglesCache.Add(m, lookup);
return(lookup);
}