Threejs Volumetric Clouds Agent Skill
Implement volumetric cloud systems in Three.js. Use for weather-driven density, bounded raymarching, shape/detail erosion, vertical profiles, lighting cones, silver lining, temporal reconstruction, cloud shadows, multiple layers, and scalable quality modes.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills --skill threejs-volumetric-cloudsThe instruction itself
5 sections, as written by the authorVolumetric Clouds
Cloud quality comes from density organization, lighting, and temporal stability—not from increasing march steps over unstructured noise.
System order
- Define the cloud volume and layer bounds.
- Generate or source weather, base-shape, detail, and turbulence fields.
- Build a density function with vertical and weather profiles.
- Raymarch only the bounded occupied segment.
- Integrate transmittance and lighting front-to-back.
- Reconstruct low-resolution output temporally.
- Project a separate low-cost cloud-shadow solution.
Read references/weather-volume-and-reconstruction.md before implementing or auditing the cloud system.
Read the weather volume cloud entry
and its source/ modules for weather-layer ownership, spherical shell bounds,
authored shape/detail sampling, cloud shadow maps, temporal upscale,
atmospheric composition, and package-owned diagnostics.
Required controls
- coverage, cloud type, precipitation, and anvil bias;
- base/top altitude and vertical density profile;
- shape/detail scales and erosion;
- wind for each field;
- primary step count, light step count, and empty-space policy;
- history weight and disocclusion threshold;
- cloud-shadow extent, resolution, and update rate.
Failure conditions
- density is only
fbm(position); - the raymarch traverses the full camera range;
- detail noise adds density instead of eroding shaped masses;
- temporal history is accepted across disocclusion;
- shadows use the full beauty raymarch;
- every cloud layer shares the same wind and density profile.
Routing boundary
Use $threejs-atmosphere-aerial-perspective for molecular/aerosol scattering
without weather density. Use $threejs-procedural-vfx for emissive aurora
curtain slabs or bounded interactive voxel fire and smoke with velocity,
pressure, emitter, and collision fields. This skill owns weather-shaped cloud
volumes, reconstruction, cloud lighting, and cloud shadows.
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How to use it
Take scottstts/threejs-volumetric-clouds from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.