import { Vec3 } from "@fimbul-works/vec";
/**
 * Generates colors using cosine-based gradient
 * @param t - Interpolation parameter (0 to 1)
 * @param a - Vec3 center of oscillation
 * @param b - Vec3 amplitude
 * @param c - Vec3 frequency
 * @param d - Vec3 phase
 * @returns Vec3 containing the generated color
 * @see https://iquilezles.org/articles/palettes/
 */
export declare function cosineGradient(t: number, a: Vec3, b: Vec3, c: Vec3, d: Vec3): Vec3;
export type CosineGradientPreset = {
    a: Vec3;
    b: Vec3;
    c: Vec3;
    d: Vec3;
};
/**
 * Generates a palette using cosine gradient
 * @param steps - Number of colors to generate
 * @param preset - Preset parameters for the cosine gradient
 * @returns Array of Vec3 colors
 */
export declare function generateCosinePalette(steps: number, preset: CosineGradientPreset): Vec3[];
export declare const COSINE_PRESET_RAINBOW: {
    readonly a: Vec3;
    readonly b: Vec3;
    readonly c: Vec3;
    readonly d: Vec3;
};
export declare const COSINE_PRESET_FIRE: {
    readonly a: Vec3;
    readonly b: Vec3;
    readonly c: Vec3;
    readonly d: Vec3;
};
export declare const COSINE_PRESET_ICE: {
    a: Vec3;
    b: Vec3;
    c: Vec3;
    d: Vec3;
};