Tree — base classes
===================

These types form the **structural vocabulary** of the OpenVCAD graph. Every design is a :class:`Node` tree: the engine evaluates signed distance and attributes by walking from the root to the leaves and aggregating results upward.

:class:`Leaf` marks **terminals** that hold geometry or field data directly (see :doc:`leaves`). Most other nodes are **composition** operators; they wrap one or more child subtrees and are modeled as :class:`Unary`, :class:`Binary`, or :class:`NAry` according to how many children they take (see :doc:`composition`). 

.. currentmodule:: pyvcad

.. autoclass:: Node
   :members:
   :undoc-members:
   :special-members: __init__

.. autoclass:: Leaf
   :members:
   :undoc-members:
   :special-members: __init__

.. autoclass:: Unary
   :members:
   :undoc-members:
   :special-members: __init__

.. autoclass:: Binary
   :members:
   :undoc-members:
   :special-members: __init__

.. autoclass:: NAry
   :members:
   :undoc-members:
   :special-members: __init__