Water distortion filter, implemented with Starling's "DisplacementMapFilter".

gistfile1.as

private function addDistortionTo(target:DisplayObject):void
{
    var offset:Number = 0;
    var scale:Number = Starling.contentScaleFactor;
    var width:int = target.width;
    var height:int = target.height;
    
    var perlinData:BitmapData = new BitmapData(width * scale, height * scale, false);
    perlinData.perlinNoise(200*scale, 20*scale, 2, 5, true, true, 0, true);
    
    var dispMap:BitmapData = new BitmapData(perlinData.width, perlinData.height * 2, false);
    dispMap.copyPixels(perlinData,perlinData.rect, new Point(0,0));
    dispMap.copyPixels(perlinData,perlinData.rect, new Point(0,perlinData.height));
    
    var texture:Texture = Texture.fromBitmapData(dispMap, false, false, scale);
    var filter:DisplacementMapFilter = new DisplacementMapFilter(texture, null,
        BitmapDataChannel.RED, BitmapDataChannel.RED, 40, 5);
    
    target.filter = filter;
    target.addEventListener("enterFrame", function(event:EnterFrameEvent):void
    {
        if (offset > height) offset -= height;
        else offset += event.passedTime * 20;
        
        filter.mapPoint.y = offset - height;
    });
}

Hi Daniel,
Thanks for the example.
I have a little issue with the rendering : each time offset > height, I have a little freeze on the animation... and I can't manage to run it smoothly...
Any idea?