Everything that moves runs in one Reanimated useFrameCallback worklet on the UI thread. A raced Gesture.Pan and Gesture.Tap only write shared values; each frame the engine reads them, steps the spin (it follows your finger, coasts, then springs to a side) and the rock and flutter springs at 240 Hz, ray-casts a tap against every card plane, encodes the WebGPU passes and records the Skia frame that composites them. After 0.6 s of stillness it stops drawing. Skia v3 renders through Graphite on Dawn, and react-native-webgpu wraps that same device with importDevice, so the 3D passes and Skia share one queue and textures cross with no copy: a 2048 px shadow map from the sun, a 4x MSAA HDR scene pass, then a 41-tap bokeh depth of field, Khronos PBR Neutral tone mapping and sRGB encode, all in WGSL. Every postcard, front and back, is painted in Skia as an SkPicture, so there are no image assets, and scripts/check-rack.mjs proves no card ever touches another card or the rack. The JS thread only plays Pulsar haptic ticks and re-renders the HUD when the scene is at rest. The title blur is a local Expo module over iOS's private variable-blur filter: it renders nothing on Android and, being a private API, may draw App Store review attention. It needs a development build (npx expo run:ios), not Expo Go, and was built on Expo SDK 57, React Native 0.86 and Reanimated 4.5.
A 3D card carousel for React Native: spin a wire rack of 24 illustrated postcards, tap one to pull it out, then flip it to read the handwritten back. Skia v3 and WebGPU share one GPU device for window light, shadows and depth of field, all driven from a single Reanimated frame callback. Drop it into a travel, gallery or collection screen where browsing should feel physical.
A 3D paper fold animation in React Native and WebGPU: tap a road map on a wire rack and it opens in your hands, ready to pinch, twist and pan. WebGPU folds one paper mesh in the vertex shader, Skia paints all nine maps in code with no image assets, and a drag scrubs the fold under your finger. Drop it into a travel app as a saved-routes screen.
A WebGPU tap game for React Native: each tap carves a crack where it lands, until the rock shatters and a glowing crystal rises out. The rock and its chunks are ray-traced with no mesh, GPU particles throw chips, dust and gold, and every hit has synthesized sound and haptics. Use it as a reward reveal, or as a working reference for WebGPU on Skia's own GPU device.
A real-time liquid simulation for React Native: hold to pour water, milk or wine into a wine glass, tip it over, and watch it splash, all on the GPU. Up to 16,384 particles run in WebGPU compute shaders on Skia's own device, so each frame reaches the canvas with no copy, and spills spread into puddles on the table. Use it as a drinks app hero screen or a WebGPU reference.
