All the needed plugins can be found in Essential Plugin Pack
You need a shape with a hole of same shape in the middle (it doesn't really have to be in the middle, but that is trickier )
Cpow3_d is the ratio of the hole to the whole shape. For example, if the hole is a circle of radius 0.5 and the shape is a circle of radius 1, cpow3_d is 0.5 / 1 = 0.5. If the hole is a square of side 1, and the shape is a square of side 3, cpow3_d is 1 / 3 = 0.333333.
Cpow3_r is equal to 360 / (rotation of hole). Lets see a few examples:
1. A circle with a circular hole. In this case, the hole can be rotated any angle compared to main shape, and it will still remain the same. So cpow3_r can take any value without creating overlaps.