create = (sides) => {
  if (sides === undefined) {
    sides = [] // empty contents
  }
  return {
    sides: sides,
    transforms: mat4.create()
  }
}
Create a new 2D geometry composed of unordered sides (two connected points).
@param {Array} [sides] - list of sides where each side is an array of two points
@returns {geom2} a new geometry
@alias module:modeling/geometries/geom2.create