Pixel-Composer/scripts/_node_smoke/_node_smoke.gml

function Node_Smoke(_x, _y, _group = noone) : Node(_x, _y, _group) constructor {
	color = COLORS.node_blend_smoke;
	icon  = THEME.smoke_sim;
	update_on_frame = true;
	
	static updateForward = function(frame = CURRENT_FRAME, _update = true) {
		if(_update) update(frame);
		//print($"Update {frame}: {name}");
		
		var outJunc = outputs[| 0];
		for( var i = 0; i < array_length(outJunc.value_to); i++ ) {
			var _to = outJunc.value_to[i];
			if(_to.value_from != outJunc) continue;
			if(!struct_has(_to.node, "updateForward")) continue;
			
			_to.node.updateForward(frame);
		}
	}
}