/**
 * Volumetric cloud layer config for `sky()` — a raymarched cloud slab mounted from the environment
 * `sky` seam. Pure config + defaulting here; the raymarch shader lives in the `shell` renderer
 * (`environment/VolumetricClouds.tsx`), mounted alongside `SkyDome` whenever a sky descriptor carries
 * this field. Off by default — omit `volumetricClouds` on `sky({...})` and no layer mounts.
 *
 * @capability volumetric-clouds raymarched cloud layer sky option
 */
/** Volumetric cloud layer params, as authored on `sky({ volumetricClouds })`. All fields optional. */
export interface VolumetricCloudsConfig {
    /** Fraction of the sky covered by cloud mass, 0..1. Higher = more overcast. Default 0.42. */
    coverage?: number;
    /** Raymarch density multiplier — thicker, more opaque cloud bodies at higher values. Default 1.5. */
    density?: number;
    /** Cloud layer base altitude in world units. Default 90. */
    height?: number;
    /** Cloud layer vertical thickness in world units. Default 55. */
    thickness?: number;
    /** Horizontal drift speed, world units/second. Default 1.1. */
    speed?: number;
    /** Noise feature scale — world units per cloud puff; larger = bigger, fewer puffs. Default 140. */
    scale?: number;
    /** Cloud body base color (shadowed side). Default "#c9d3de". */
    color?: string;
    /** Sun-facing lit edge color (silver-lining / forward scatter). Default "#fff6e0". */
    sunColor?: string;
    /** Forward sun-scatter strength, 0..1 — brighter, more luminous edges toward the sun. Default 0.9. */
    sunScatter?: number;
    /** Seed string; same seed reproduces the same cloud layout. */
    seed?: string;
}
/** Fully-defaulted volumetric cloud params, resolved from a `VolumetricCloudsConfig`. */
export interface VolumetricCloudsRules {
    coverage: number;
    density: number;
    height: number;
    thickness: number;
    speed: number;
    scale: number;
    color: string;
    sunColor: string;
    sunScatter: number;
    seed: string;
}
/** Volumetric cloud defaults: a moderate, drifting cumulus layer. */
export declare const VOLUMETRIC_CLOUDS_DEFAULTS: VolumetricCloudsRules;
/**
 * Resolve a `VolumetricCloudsConfig` into fully-defaulted, clamped rules — pure, no shader/DOM
 * involved, so the defaulting logic is unit-testable without a renderer.
 * @internal
 */
export declare function resolveVolumetricClouds(config?: VolumetricCloudsConfig): VolumetricCloudsRules;