0.8.6

Other worlds. Land and Sky becomes a world builder: presets you pick, save and share, with Earth, Mars, Venus, the Moon, Io and Titan built in. A crater field landform, volcano fields, ground palettes, sea colours, and a sun whose size and brightness follow the world. Lightning casts shadows and darkens the day, and the aircraft demo has weather to fly in.

Size: barrel (min, packages external) 885.2 KB raw / 296.3 KB gz, about +0.3% on 0.8.5.

Added

• Land and Sky presets (board #2442, stage 1): a whole world as data (terrain, sea, climate, weather, atmosphere, stars, moons, cloud colours, sun) you pick from the ⚙ panel's new World section, save as a new preset (kept in your browser) or copy and paste as JSON. Built in: Earth, Mars and Venus. A preset lists only what it changes, over Earth.
• The sun's size and brightness per world (b3d-skybox sunSize, sunBrightness): the disc (and its glow in vacuum and in the water window's HDR capture) scales with 1/distance (Venus 1.39, Mars 0.66, Io 0.19, Titan 0.11); its light is set by how it LOOKS (a log curve), not by the inverse square, because the eye adapts.
• Venus is one giant lightning storm under a maxed, sulfur-yellow deck; Land and Sky's storm is preset-able (where, how big, the cover it adds, how often it strikes). Mars is red: hot and bone-dry, so the palette's red dust (temperature falls with altitude; a cooler Mars went grey). The volcano is off for both until each world has its own landforms.
• craterField (landform): a whole cratered surface, seeded and unbounded. Sizes in doubling classes, one grid per class sized to its craters, so a real 1/size-squared population is one presence roll per cell and a terrain sample checks one cell per class. Big (old) craters first, small ones punch into them; each worn to its own age; complex craters (flat floor, central peak) past complexRadius. Land and Sky has a craters slider; Mars 0.35, Venus 0.06 (its surface is young). Dry worlds have no sea (sea: false): no water plane, no shore colours.
• Moon, Io and Titan presets. The Moon: airless, saturated craters, grey regolith, stars at noon, Earth in its sky. Io: a sulfur palette (frost, yellow, orange-red, black lava), a field of hot volcanoes, a tiny sun. Titan: orange haze and cloud over dark amber methane seas, a tiny, dim sun. Land and Sky gains volcanoes (a seeded field), a ground palette (swapped on the biome shader) and sea colours. b3d-water gains fogColor: the colour of the water you are in, which the underwater fog, the medium and the light shafts all read.
• Venus: no rain, gentler relief. Its sulfuric acid rain evaporates before reaching the ground, and the surface is mostly smooth lava plains; the storm's rain is now a preset setting (stormRain).
• The aircraft demo has weather to fly in: ⚙ sliders for wind (blowing across your starting heading, so you crab) and storminess (a storm cell over the whole arena), and a live turbulence readout.

Fixed

• Lightning bolts vanished into haze while their light still lit the ground (Tonio: "I see flashes but never seem to see lightning strokes"): under a closed deck the scene fog swallowed the bolt meshes. Bolts ignore fog now; they are far brighter than anything it hides.
• Distant lightning strokes did not render: a 1.6 m channel is a small fraction of a pixel a few kilometres off, so under a big storm most bolts vanished while their flash lit everything. Bolts (and their glow) now scale with distance, never thinner than about a pixel and a half.