The target tracker doesn't automatically come with a visual guide for the user, so you need to build one yourself. We only need to keep it visible until the actual image is recognized, though.
Download the stop sign textures on the Spark AR Masterclass website.
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Learn how to make Instagram filters by following along with the Spark AR Masterclass on YouTube! Just hop over to the playlists page ( / eddyadamsin3d ) and start with Chapter 1.
Follow for more Spark AR tips!
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