@woosh/meep-engine/src/core/geom/3d/plane/plane3_lerp.js

Pure JavaScript game engine. Fully featured and production ready.

import { lerp } from "../../../math/lerp.js";
import { plane3_normalize } from "./plane3_normalize.js";


/**
 * Interpolate between two planes in linear space.
 *
 * Note: It does not work for planes that are parallel with opposing normals. There is no valid solution, as the number of such planes would be infinite.
 * @param {number[]} destination
 * @param {number} destination_offset
 * @param {number} a_normal_x
 * @param {number} a_normal_y
 * @param {number} a_normal_z
 * @param {number} a_constant
 * @param {number} b_normal_x
 * @param {number} b_normal_y
 * @param {number} b_normal_z
 * @param {number} b_constant
 * @param {number} t
 */
export function plane3_lerp(
    destination, destination_offset,
    a_normal_x, a_normal_y, a_normal_z, a_constant,
    b_normal_x, b_normal_y, b_normal_z, b_constant,
    t
) {

    const nx = lerp(a_normal_x, b_normal_x, t);
    const ny = lerp(a_normal_y, b_normal_y, t);
    const nz = lerp(a_normal_z, b_normal_z, t);
    const c = lerp(a_constant, b_constant, t);

    plane3_normalize(
        destination, destination_offset,
        nx, ny, nz, c
    );
}