0.6.2

Terrain gets volcanism and authored landforms, clouds get real shapes, and a systemic timing bug that made half the engine run in slow motion is fixed. Additive only — no API removals, no peer-dependency changes. (The full terrain-system upgrade lands as 0.7.0 once its remaining pieces are in.)

Added

• Volcanism intensity ladder (biome-plugin) — the volcanism dial now climbs stages rather than scaling one look: near-black basalt with dark-brown voronoi seams → dark-brown rock with glowing seams → patchy open lava. Verticals lag one stage behind horizontals (lava pools flat; cliff faces drain and crust over), veins widen as the ladder climbs so pools form by veins merging, and the glow is subtly animated (spatially-phased pulse + drifting 3D-noise churn — never a global blink). Water pushes the ladder down half a stage and mutes the glow with depth instead of cancelling it: smouldering veins under shallow water.
• volcanicPalette + LAVA_PALETTE / CRYOVOLCANIC_PALETTE — the seven ladder colours are data, so a frozen world venting molten water (pale ice rock, teal veins, glowing blue-white melt) is a palette swap, not a new shader.
• Local volcanic provinces — b3dTerrain.provinceField = (x, z) => 0..1 marks this island volcanic independently of the global dial. Sampled per tile vertex in origin-stable coordinates and carried to the shader in the colour buffer's (visually inert) alpha channel.
• landform — authored landforms FORCED through the terrain noise via the new b3dTerrain.landform hook, where slope-profiles only remap it. volcano() and impactCrater() each return a matched pair — the height shape and the volcanism province that makes it glow — so a volcano goes anywhere and an explosion leaves a glowing crater. pad() claims flat ground for cities and bases; composeLandforms / mergeProvinces chain them. Pure, deterministic, unit-tested.
• _centerOfGravity model convention — a child node with that suffix declares where a vehicle pivots in flight, while the root origin stays its on-ground stance point, so one model conveys both how it flies and how it plants. findCenterOfGravity/applyCenterOfGravity are exported; b3d-aircraft applies it on both load paths.
• b3dClouds({ model }) — an authored GLB mesh becomes the cloud lobe (normalized on load, bottom-aligned), and clouds are now built as clusters of 2–4 overlapping lobes laid out by size rank (biggest low, smallest on top straddling the pair) with aligned bases, since cumulus condense at a level.
• B3d.frameDelta + sceneDelta(scene) — the authoritative inter-render delta (see Fixed).

Fixed

• Everything ticking in a scene observer ran in slow motion. Babylon's getDeltaTime() measures the engine's rAF tick, but scene observers only fire when scene.render() runs — and <tosi-b3d> throttles rendering to frameRate. At frameRate: 60 on a 120Hz display that's half speed; at the default 30, a quarter. Measured live: a dropped bomb inherited exactly 50% of the aircraft's velocity. B3d now publishes the real delta and 14 call sites use it — projectiles, missiles, turret, radar, warhead FX, spawner, clouds, ambient, death orbit, exploder, star / star-system / planet / black-hole.
• canonicalize applied a spurious 180° yaw, flying correctly-authored (Blender −Y-forward) models backwards. Babylon reads node-local data raw — the handedness flip lives only on the discarded __root__ — so the collapse now applies no rotation, it only cleans. Pinned against real content in model-frame.test.ts.
• Weapons inherited a phantom velocity. this.velocity is only the aircraft's hover/ground integrator and reads zero in wing-borne flight; weapons now inherit the true world velocity, so bombs fall with you and cannon rounds lead correctly.
• Weapon muzzles are computed through the world matrix, so shots leave the visible airframe under any attitude or centre-of-gravity pivot.
• Flying into a cliff face passed through it — the ground check was a single downward ray, which reports the valley floor while a wall fills the windscreen. Airborne frames now also sweep along the velocity; steep contacts crash.
• Death could strand you in the wreck. Charring the wreck cloned a material carrying an unregistered plugin, Babylon threw, and the sequence aborted after the explosion but before releasing input focus — no spectate camera, no respawn panel. Material plugins are now registered for cloning, and death's exit is shielded so cosmetics can never block it again.
• Volcano calderas are flat-floored basins with the melt confined to the floor and a crusted rim (a smoothed shading normal can't make the rim read as open lava).
• Library instances carry their animations, retargeted onto the instance.