Hi everyone,
First of all, sorry of my english, i’m french.
I’ve made a material that make a julia’s set fractal in 2D. I’m starting with uv coordinate and plug it in my custom expression that makes the algorithme of the julia’s set. My custom expretion output a vector3 witch represent the color of every pixel of my material. I plug this vector in my base color. It work’s fine in the preview screen but when i apply this material on a static mesh in the game world, every pixel seem’s to move, or change color. I have put my material resolution to the maximum but it’s not working. It seems like a problem of oversampling and i don’t know how to fixe it. My custom expression is not using a parameter that change over time. 
Thank you