modeling/src/maths/vec3/rotateX.js

/**
 * Rotate the given vector around the given origin, X axis only.
 *
 * @param {vec3} out - receiving vector
 * @param {vec3} vector - vector to rotate
 * @param {vec3} origin - origin of the rotation
 * @param {Number} radians - angle of rotation
 * @returns {vec3} out
 * @alias module:modeling/maths/vec3.rotateX
 */
const rotateX = (out, vector, origin, radians) => {
  const p = []
  const r = []
  // translate point to the origin
  p[0] = vector[0] - origin[0]
  p[1] = vector[1] - origin[1]
  p[2] = vector[2] - origin[2]
  // perform rotation
  r[0] = p[0]
  r[1] = p[1] * Math.cos(radians) - p[2] * Math.sin(radians)
  r[2] = p[1] * Math.sin(radians) + p[2] * Math.cos(radians)
  // translate to correct position
  out[0] = r[0] + origin[0]
  out[1] = r[1] + origin[1]
  out[2] = r[2] + origin[2]
  return out
}
module.exports = rotateX