* fix artifacts on mobile
* feat(skybox): Add moon and milky way rendering
This commit enhances the simulated skybox with the following features:
- **Moon Rendering:** A textured moon with normal mapping has been added. The moon's phase is calculated and rendered correctly. Earthshine is also simulated.
- **Milky Way Background:** An equirectangular milky way texture is now rendered in the background. The intensity and saturation of the milky way can be adjusted.
- **Asset Processing Scripts:** Python scripts have been added to download and process the moon and milky way textures. This includes generating a normal map from a displacement map for the moon.
- **GUI Controls:** The GUI has been updated to include controls for the moon (azimuth, height, intensity, radius) and the milky way (intensity, saturation, sidereal time, latitude).
- **Real-time Sync:** The application can now use the user's geolocation to automatically set the position of the sun and moon.
- **Sun/Moon Calculation:** The library has been added to calculate the position of the sun and moon.
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- Fix Moon normal calculation in shader (was inverted).
- Implement physically based Earthshine (dynamic based on phase).
- Add Moon scattering to Water reflection.
- Fix Star occlusion (masked by Moon).
- Improved Stars
- Add mobile touch support (Orbit control) to Camera.
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- **Key Minification**: Refactored serialization to use short keys
(e.g., `p`, `c`, `w`) instead of verbose property names, reducing URL
size by ~50%.
- **State Optimization**: Removed redundant `sunDirection` from
serialized state.
- **Cleanup**: Removed backward compatibility for verbose keys
- **Bug Fix**: Fixed a regression where UI sliders failed to update on
load by ensuring array properties (e.g., `sunHalo`) are mutated
in-place rather than replaced.
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- **State Management**:
- Refactored main.js to expose local UI parameter objects as class
properties for serialization.
- Implemented getURLState() to capture complete scene configuration
(Sky, Clouds, Water, Stars, Camera, Bloom).
- Implemented applyURLState() to restore settings and synchronize
the UI.
- **URL Sharing**:
- Added "Share Configuration" button to the UI.
- Configuration is Base64-encoded into a `config` URL query parameter.
- App now automatically parses and applies the `config` parameter
on startup, allowing for stateful deep linking.
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- **Stars**:
- Implemented procedural stars using hash-based noise.
- Added UI controls for Star Density and Enable/Disable.
- Tuned star brightness (reduced intensity) and refined twilight fade timing (visible during nautical twilight).
- Improved compositing with aggressive cloud occlusion and non-linear fade.
- Added star reflections to water, strictly masked to the horizon line.
- **Heat Shimmer**:
- Fixed horizon artifacts by decoupling shimmer from atmospheric density (Mie scattering).
- Implemented FBM-based view distortion for heat waves.
- Added sun elevation fade (shimmer fades out as sun rises > 30°).
- **Water**:
- Implemented Finite Difference normal calculation as a high-quality fallback when "Derivative Trick" is disabled.
- Added "Octaves" parameter to control wave detail.
- Refined reflection logic to handle stars and sun disk properly.
- **System**:
- Updated [simulated_skybox.mat](cci:7://file:///Users/mathias/sources/git/filament/docs_src/src_raw/wip/sky/simulated_skybox.mat:0:0-0:0) with new material parameters (`starControl`, `waterControl`).
- Refactored JS bindings in [SimulatedSkybox.js](cci:7://file:///Users/mathias/sources/git/filament/docs_src/src_raw/wip/sky/SimulatedSkybox.js:0:0-0:0) and organized `main.js` UI into logical folders.
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