Been working on something fun lately – building an interactive 3D particle system that responds to your hand movements in real-time.

The setup uses Three.js for rendering and tracks both hands through your camera. What makes it interesting? You can control how particles scale and expand just by tensing or closing your hands. It's surprisingly intuitive once you get the hang of it.

I've also thrown in a template switcher – you can toggle between different particle shapes like hearts, flowers, saturn rings, and fireworks. Each one reacts differently to your gestures, which creates some pretty cool visual effects.

Still tweaking the hand detection sensitivity and particle physics, but the core interaction is working smoothly. Might add more templates later if people find this useful for their projects.