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  1. Ok, my project is going to be on ships2career.com . Here is what I am doing: I use pixijs as an overlay on Google maps. I animate ships as pixi sprites on a transparent stage but I want it to look like the ships pass UNDER a bridge. Currently I use a bitmap editor and create separate images for each bridge and render then in the pixi stage (see pic). Very inefficient and maintenance prone (When google updates satellite imagery). I much rather specify a polygon outlining the bridge and somehow use a mask so the appropriate part of the pixi sprite ship is not rendered. I played with masks but what I really need is the inverse of a mask I suppose but I understand that isn't going to happen unless I am prepared to change my local code (Not that I quite know how). Is there anyway I can achieve what is shown in the picture using a masking technique without the need to resort to image overlays?