Add Shadertoy effect to Spark AR

I wrote an article to introduce "How to add Shadertoy effect to Spark AR".

It is about AR and Shader.

Detail:

https://contra.medium.com/how-to-add-shadertoy-effect-to-spark-ar-9a4625e2c315

or

https://floatbug.com/how-to-add-shadertoy-effect-to-spark-ar/

And the source Spark AR Studio project file here. (Shader example included.)

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