public static Mesh Submesh(this Mesh mesh, int submeshIndex)
{
if (submeshIndex < 0 || submeshIndex >= mesh.subMeshCount)
{
return(null);
}
int[] indices = mesh.GetTriangles(submeshIndex);
Vertices source = new Vertices(mesh);
Vertices dest = new Vertices();
Dictionary <int, int> map = new Dictionary <int, int>();
int[] newIndices = new int[indices.Length];
for (int i = 0; i < indices.Length; i++)
{
int o = indices[i];
if (!map.TryGetValue(o, out int n))
{
n = dest.Add(source, o);
map.Add(o, n);
}
newIndices[i] = n;
}
Mesh submesh = new Mesh();
dest.AssignTo(submesh);
submesh.triangles = newIndices;
submesh.name = $"{mesh.NameFormatted()}_{submeshIndex}";
return(submesh);
}
public static Mesh GetSubmesh(this Mesh aMesh, int aSubMeshIndex)
{
if (aSubMeshIndex < 0 || aSubMeshIndex >= aMesh.subMeshCount)
{
return(null);
}
int[] indices = aMesh.GetTriangles(aSubMeshIndex);
Vertices source = new Vertices(aMesh);
Vertices dest = new Vertices();
Dictionary <int, int> map = new Dictionary <int, int>();
int[] newIndices = new int[indices.Length];
for (int i = 0; i < indices.Length; i++)
{
int o = indices[i];
int n;
if (!map.TryGetValue(o, out n))
{
n = dest.Add(source, o);
map.Add(o, n);
}
newIndices[i] = n;
}
Mesh m = new Mesh();
dest.AssignTo(m);
m.triangles = newIndices;
return(m);
}
