sadly i'm still a bit confused on what the coordinates mean in effects. Yeah they seem to be different in the IDE and in the runtime. 0 is top-left and 1 is bottom-right though.
What puzzles me is those flickering lines. I can't imagine why they come up.
EDIT: Just figured out the bug with the coordinates!! It's actually a Construct bug. The ide uses coordinates for the layout area where 0 is top-left and 1 is bottom-right... but that's the layout AREA, not just the layout! To test this out, hold mouse wheel and drag around.... and watch the objects lighting change.
I also noticed that it looks glitchy in the IDE unless I'm zoomed... so it's probably some kind of sampling alias.... I'll move the samples around, see what happens.