I am trying to model an organic object using OpenSCAD. However this will need to be ported over to older software. This restricts the primitives I can use (only cone, cylinder, torus, sphere and cubes) and the operations I can perform (difference, union, intersection, scaling and transformation). However modeling with these restrictions gives very unnatural looking objects. I need to somehow implement by hand, using only these primitives/operations the hull and minkowski operations to give my models a more organic look. Does anybody know how this could be done?