SwiftUI Metal shader

Prism

A glass prism with a beam entering it and the spectrum fanning out of the far face. The rainbow is traced, not painted: the beam is refracted through the solid's real cross-section with Snell's law once per colour, so turning the prism, widening it, changing its facet count or raising the refraction index moves the fan exactly as glass would — including total internal reflection, and the forced internal bounces that turn a prism into a raindrop. Forty-eight knobs: the shape, the glass, the lamp, the spectrum, the paper it is drawn on, and five ways to make it drift.

SwiftUIReact NativeWeb

Open in the editor All effects

How it works

Prism is a real [[stitchable]] Metal shader, not a video or an image. It runs as a SwiftUI .colorEffect, so it paints any view you attach it to. You shape it with sliders in a live preview, then export the .metal file and the SwiftUI code that uses it, or the React Native and Web version. No MSL to write.