public void generateMesh()
{
if( spriteSheet == null || sourceImageName == null )
return;
Mesh mesh = new Mesh();
meshFilter.sharedMesh = mesh;
mesh.name = "SKMesh";
mesh.hideFlags = HideFlags.HideAndDontSave;
generateVerts( ref mesh );
mesh.RecalculateBounds();
mesh.RecalculateNormals();
}