Stage3D developer tips:

Adding “Alpha Holes” in ND2D

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From BJÖRN ACKER:

“For my current side project – a comic zombie shooter game – for which I utilize the ND2D framework - I wanted to add some atmosphere by putting a colored fog layer on top of all game layers, from which I could cut out multiple alpha masks to get something like search lights or illuminated auras. After building some – at least for myself – super complex AGAL fragment shaders I ended up with a pretty simple solution”