Controls & rendering
The field extends throughout space: gyroid sheets stretch and fold through volume-preserving shears. Space fill controls the thickness of the flowing sheets; Endless forward flight replaces the old Current scale effect: it advances through fresh cloud continuously, without a scale reset or reversal. Cloud structure size sets the size of the strands separately. Flight follows the world forward axis; rotation lets you look around while traveling. This is procedural fluid-like motion, not a physical fluid solver. Drag to orbit through 360°. Shift-drag to roll. Scroll to zoom. Space pauses; H hides everything. AUTO adds a smooth variation around a slider's base value.
Master PNG renders at 4608 × 1512. The frame API is spun.setCaptureSize(4608,1512), then spun.renderFrame(frame,30). Read the canvas after each call; frames can be rendered in any order. Call spun.resume() for playback. No MP4 encoder is bundled.