Pointer Trail Emitter Build the emitter yourself when the trail's density has to respond to how fast the hand is moving. Reach for or when you want the packaged WebGPU looks from the Shaders library. Reach for when the cursor exposes a second image through a mask. Reach for when motes fill a section and the pointer only disturbs them. Reach for this when the pointer lays them. The bundled demo keeps the stage intentionally neutral. A plain dark field makes spacing, scatter, and coast easy to judge without a background image competing with the trail. The wisps are dependency-free Vanilla JavaS…