Simple way to create a "pixel shader" in UPBGE 0.2.5. (UPBGE Tutorial)

Three weeks ago I was playing with UPBGE 0.2.5's refraction feature. Inspiration for this method here: https://www.youtube.com/watch?v=rALfeV7-pH0 Voir sur youtube
Three weeks ago I was playing with UPBGE 0.2.5's refraction feature. Inspiration for this method here: https://www.youtube.com/watch?v=rALfeV7-pH0 Voir sur youtube