code: function(m){
          return new Vec3(
              this.x*m[0][0]+this.y*m[0][1]+this.z*m[0][2],
              this.x*m[1][0]+this.y*m[1][1]+this.z*m[1][2],
              this.x*m[2][0]+this.y*m[2][1]+this.z*m[2][2]
          );
      }
docs: Creates a new vector converting the vector to a new coordinate frame.
  @memberof Vec3#
  @param {Array} m - Coordinate system matrix of the form [[xx,xy,xz],[yx,yy,yz],[zx,zy,zz]]
  @returns {Vec3}