### 12.11.1 Ellipses in space: ellipse

See section 11.12.1 for ellipses in the plane.

The ellipse command takes three non-collinear points as arguments; two
points as the foci and a third point to determine the plane.

ellipse returns and draws the ellipse with the two given foci
and passing through the third argument.

Input:

ellipse(point(-1,0,0),point(1,0,0),point(1,1,1))

Output: