void AddCapsule(float diameter, float height, float kilograms, Nullable`1 offset)

float diameter The diameter of the cylinder, as well as the capsule ends, in meters.
float height The total width, height, and depth of the box in meters!
float kilograms How many kilograms does this shape weigh?
Nullable`1 offset Offset of this shape from the center of the solid.

This adds a capsule, a cylinder with rounded ends, to this solid’s physical shape! This is in addition to any other shapes you’ve added to this solid.