Blitz will automatically cull entities which are outwith the view frustum and probably do it a good bit faster than you'd achieve using your own solution.
You can use cameraproject to get the entities position relative to the viewport but projectedx, y will return 0,0 if outwith.
Stevie
You can use cameraproject to get the entities position relative to the viewport but projectedx, y will return 0,0 if outwith.
Stevie