How to create 3D General Geometry
Hydrus geometrical editor uses B-REP techniques. The basic elements are:
More complex objects are defined using simpler objects. For example, a surface is defined by indices of its boundary curves, and a boundary curve is defined by indices of its points. A relation „Parent – Descendent“ exists among objects. In case of a curve, points are „Parent“ objects and a Surface is its „Descendent (Child object) “. On account of these “links” between object cannot be deleted any parent object/s without important influence to children one.
Rules for correct (manifold) geometry definition.