/**
 * Approximate 3D insphere test.  Non-robust.
 *
 * Return a positive value if the point pe lies inside the
 * sphere passing through pa, pb, pc, and pd; a negative value
 * if it lies outside; and zero if the five points are
 * cospherical.  The points pa, pb, pc, and pd must be ordered
 * so that they have a positive orientation (as defined by
 * orient3d()), or the sign of the result will be reversed.
 *
 * @see "Adaptive Precision Floating-Point Arithmetic and Fast Robust Geometric Predicates." Technical Report CMU-CS-96-140, School of Computer Science, Carnegie Mellon University, Pittsburgh, Pennsylvania, May 1996
 * @see http://www.cs.cmu.edu/~quake/robust.html
 * @see https://gitlab.onelab.info/gmsh/gmsh/-/blob/master/contrib/hxt/predicates/src/predicates.c
 * @param {number[]} points
 * @param {number} a tetrahedral point index
 * @param {number} b tetrahedral point index
 * @param {number} c tetrahedral point index
 * @param {number} d tetrahedral point index
 * @param {number} e reference point index that we are testing against the tetrahedron
 * @returns {number}
 */
export function in_sphere3d_fast(points: number[], a: number, b: number, c: number, d: number, e: number): number;
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