@jscad/regl-renderer/src/bound-utils/boundingBox.js

Renderer for JSCAD Geometries

// modified version of https://github.com/thibauts/vertices-bounding-box that also works with non nested positions
const boundingBox = (positions) => {
  if (positions.length === 0) {
    return [[0, 0, 0], [0, 0, 0]]
  }

  const nested = (Array.isArray(positions) && Array.isArray(positions[0]))

  const dimensions = nested ? positions[0].length : 3
  const min = new Array(dimensions)
  const max = new Array(dimensions)

  for (let i = 0; i < dimensions; i += 1) {
    min[i] = Infinity
    max[i] = -Infinity
  }

  if (nested) {
    positions.forEach((position) => {
      for (let i = 0; i < dimensions; i += 1) {
        const _position = nested ? position[i] : position
        max[i] = _position > max[i] ? _position : max[i] // position[i] > max[i] ? position[i] : max[i]
        min[i] = _position < min[i] ? _position : min[i] // min[i] = position[i] < min[i] ? position[i] : min[i]
      }
    })
  } else {
    for (let j = 0; j < positions.length; j += dimensions) {
      for (let i = 0; i < dimensions; i += 1) {
        const _position = positions[i + j] // nested ? positions[i] : position
        max[i] = _position > max[i] ? _position : max[i] // position[i] > max[i] ? position[i] : max[i]
        min[i] = _position < min[i] ? _position : min[i] // min[i] = position[i] < min[i] ? position[i] : min[i]
      }
    }
  }

  return [min, max]
}
module.exports = boundingBox