Perlin Noise and Distortion in Spark AR

Learn how to apply a Perlin noise trick to distort images. I start by de-mystifying texture coordinates, and throw in a few other tips along the way.

Project files: https://github.com/positlabs/spark-pe...

Color adjustment repo: https://github.com/positlabs/spark-co...

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NOTE: I realized why the texture blips out occasionally. It happens when you are using the subtract blend mode and the textures are both in the same position. You can solve this by adding some arbitrary number to one of the UV offsets.

Also, there's an integer overflow issue if you use runtime. It will make the textures crunchy over time. You can use a loop animation patch in place of runtime to solve this.