protected void ClearMesh()
{
if (vertices == null)
EnlargeMesh();
for(int i=0; i<vertices.Length; ++i)
{
vertices[i] = Vector3.zero;
meshColors[i] = color;
}
topLeft = Vector3.zero;
bottomRight = Vector3.zero;
unclippedTL = Vector3.zero;
unclippedBR = Vector3.zero;
}