# Module Reference

This file provides a mapping of modules to their primary responsibilities and key symbols.

## Root

- `__init__.py`:
    - **Entry Point**: Extension registration (`register`, `unregister`).
    - **Node Tree**: `SLICETREE_NodeTree` class.
    - **Sockets**: Definitions for all `SLICESOCK_*` classes.
    - **Nodes**: Definitions for all `SLICENODE_*` classes.
    - **Evaluation Engine**: 
        - `_resolve_input()`: Recursively evaluates linked sockets.
        - `_resolve_output()`: Computes node outputs with a caching system (`_EvalCache`) to avoid redundant calculations.
        - `_follow_reroute()`: Handles Blender's Reroute nodes during evaluation.
    - **Error Handling**: `NodeException` for user-facing evaluation errors.

- `registry.py`: 
    - **Auto-Registration**: Utility to track classes decorated with `@register_class`.
    - **Resource Management**: Logic for dynamic icon and timer registration.

- `blender_manifest.toml`: 
    - Metadata for the Blender Extension platform.
    - Lists required wheels (Shapely, PyClipper) for different platforms.

- `pyproject.toml`: 
    - Standard Python project configuration.
    - Lists development and runtime dependencies.

## `/core` (Geometry & Slicing)

- `slice.py`:
    - `slice_at_range()`: Top-level slicing function that iterates through Z-heights.
    - `slice_at_z()`: Vectorized plane-mesh intersection using NumPy.
    - `Pather`: Class that converts toolpaths into G-code strings. Handles layer change comments and extrusion calculations.
    - `segments_to_slice()`: Utility to convert raw intersection segments into closed loops using Pyclipper and the Even-Odd fill rule.
    - `link_segments()`: Logic for joining loose segments into continuous paths.
    - `buffer_slice()`: Offset utility using PyclipperOffset. Groups paths by Z-height to ensure independent buffering of layers.

- `geometry.py`:
    - `crc32_array()`: High-performance checksum generation for NumPy arrays, used for internal caching and data validation.

## `/infra` (Blender Integration)

- `blender_mesh_capture.py`:
    - `SlicingObject`: Represents a single mesh as a NumPy triangle array. Computes bounding boxes and checksums.
    - `SlicingCollection` / `SlicingGroup`: Hierarchical wrappers for managing multiple meshes and their metadata (e.g., Wipe Tower location).
    - `objects_to_tris()`: Performance-critical function that extracts mesh data from Blender objects into NumPy arrays using `foreach_get`. Handles world-space transformation and unit scaling.

- `blender_bridge.py`:
    - **Hierarchy Utilities**: Helpers like `get_all_children()` for traversing Blender's object tree.