/**
 * Returns signed distance from `p` to torus centered around Y-axis with
 * radii `r1`, `r2`.
 *
 * @param p - vec3
 * @param r1 - float
 * @param r2 - float
 */
export declare const sdfTorus: import("@thi.ng/shader-ast").TaggedFn3<"vec3", "float", "float", "float">;
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