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  1. I'm having similar problem understanding this conversion between the coordinates. I'm trying to create a filter that creates an animated "growing circle", like wave, that grows with "time". I would like to generally set the center to [0.5, 0.5] so that it centers on the sprite. However, it doesn't seem like so and moving the sprite's position also makes it changes. I've applied the "mapCoord" as suggested. Please see: https://jsfiddle.net/3j9xxutf/1/