Write a Javascript function regularPolygonGeometry(n, innerColor, outerColor) that returns a Geometry object that represents an n-sided regular polygon. The polygon should be centered at the origin, lie in the xy-plane, and have radius 2 (the distance from the origin to each of the polygon's n vertices is equal to 2). Use your function in a three.js program that produces an 8-sided (or 12- or 16- or whatever-sided) polygon. Colors get interpolated from innerColorassigned to the polygon's center to outerColor assigned to its n vertices. The geometry of the following image was produced by regularPolygonGeometry(8, red, blue) where the variables red and blue had been assigned the obvious colors.