Reference:Ovus

An ovus is a shape that looks like an egg. A Change in version 3.8 has extended the syntax of the ovus object by adding radius, distance and precision controls.

The syntax is as follows:

ovus {
  Bottom_radius, Top_radius [radius Inner_radius] [distance Vertical_distance] [precision Root_tolerance]
  [OBJECT_MODIFIERS...] 
  }

Where Bottom_radius is a float value giving the radius of the bottom sphere and Top_radius is a float specifying the radius of the top sphere. The top and bottom spheres are connected together with a suitably truncated lemon, or self intersection of a torus, that is automatically computed so as to provide the needed continuity to the shape. The distance is a float value that represents the length between the center of the two spheres, defaulting to Bottom_radius. The radius float value represents the inner circle of the connecting torus and it's default is twice the greater of either Top_radius or Bottom_radius. The precision float value is the tolerance used for the root solving of the connecting torus, and it's default is 1e-4. If additional accuracy is required you can now add the sturm object modifier.

The center of the top sphere lies on the top of the bottom sphere
The bottom sphere of the ovus is centered at the origin
The top sphere of the ovus lies on the y-axis
The minor radius of the lemon is twice the largest radius
The distance must be greater than or equal to Bottom_radius
The radius must be greater than or equal to half the sum of Bottom_radius, Top_radius and Vertical_distance

An ovus 2D section

The ovus and it's constituent 3D shapes

Note: According to the ratio of the radius, the pointy part is the smallest radius, but is not always on top!

Evolution of ratio from 0 to 1.95 in 0.15 steps.

Reference:Ovus

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