KOMPAS-3D v23

Hierarchy of model objects is the order of their subordination to one another.

You can use objects that already exist to create any object of the model (for example, you need a plane or face to create a sketch, or an edge to create a chamfer, etc.).

An object for the creation of which any parts and/or properties of another object were used is considered to be subordinate to this object.

For example, if the sketch is built on the face of the extrusion element, then the sketch is subordinate to the element. If the sketch has edge projections of the glued mass element, then the sketch is subordinate to this element. If the cut mass element is built by executing an operation on the sketch, then the element is subordinate to the sketch. If, when gluing the mass element, the depth of its extrusion was specified to the vertex of the rotation element, then the extrusion element is subordinate to the rotation element. If the chamfer is built on the edge of the swept element, then the chamfer is subordinate to the swept element. If the construction axis is drawn through the vertices of mass elements, then the axis is subordinate to these elements. If the construction plane is drawn through the axis perpendicular to the face of the mass element, then the plane is subordinate to the axis and mass element. And so on.

There are two types of relations available in the KOMPAS-3D model object hierarchy.

•If one object is subordinate to another object, it is called derived in relation to the subordinating object.

•If another object is subordinate to the object, then the subordinating object is called source in relation to the subordinate object.

The coordinate system that exists in the model immediately after its creation is always a source object (you can build the first sketch and other model objects only based on the coordinate system or its elements – coordinate planes) and it is never a derived object (its parameters do not depend on other objects).

The last object in the Design Tree is never a source object (since no objects that could be based on it were built afterwards).

All other objects could be both source and derived. The same object can be derived and source for different objects. For example, a hole is a derived object of its own sketch and a source object for a chamfer built on the edge of this hole.

An object is always derived from one or several objects located above it in the Design Tree and can be a source for one or several objects located below it in the Design Tree.

However, this rule does not define clearly the relations of particular objects. Looking at the position of objects in the Tree, it is not possible to define which of them are source and/or derived in relation to this object.

If required, you can view relations of any model object (see section Viewing Object Relations).