Solid.AddBox

void AddBox(Vec3 dimensions, float kilograms, Nullable`1 offset)

   
Vec3 dimensions 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 box to this solid’s physical shape! This is in addition to any other shapes you’ve added to this solid.