thermal-finger-trail

Build an interactive heat-camera field that a finger or cursor smears like wet paint — a WebGL fragment shader with a domain-warped thermal blob, a seven-stop heat ramp, a velocity-carrying pointer trail, and a press ripple. Use when the user wants a thermal/heatmap effect, a "finger through paint" or smudge interaction, a living gradient that reacts to touch, a trackpad/touch-surface hero, or the Clicker disc effect. Also use for any reactive shader field driven by a pointer trail.