Letter grid v4 — Trail
The hopping letter now drags a solid ribbon behind it: its silhouette lofted through the air, twisting with the tumble, morphing tail to head, fading on a set lifetime.
letter-grid v4 — "trail" (the one we actually wanted — a bit like Tron)
The leaping letter of v3 now leaves a CONTINUOUS VOLUMETRIC TRAIL behind it: as it springs from one cell to the next, tumbling and morphing into the letter it lands on, the swept path of its outline is lofted into a solid 3D ribbon — the letter's silhouette dragged through the air, twisting with the tumble and morphing along its length from the older letter (tail) to the current one (head). The trail glows, fades out over a configurable LIFETIME (so it can persist across several letters), and casts a soft shadow on the terrain below.
It is rebuilt every frame as a pure function of animation.progression by sampling the head's trajectory BACKWARD in time and reconstructing each past state exactly — so it loops seamlessly and is recording-safe (no orbitControl, no Date.now/random). Reuses the shared grid/word engine (../_grid.js) and the shared extruded-glyph + morph geometry (../_extrude3d.js).
