# Spatial Rendering -- Technical Specification

**Version**: v1.0.0 | **Status**: Placeholder | **Last Updated**: March 2026

## Overview

Reserved subpackage for spatial visualization backends within the `spatial`
module. Currently contains only the package marker `__init__.py` with an
empty `__all__` export list and no concrete implementation.

## Architecture

No classes or functions are implemented. When concrete functionality is
added, it should follow the adapter pattern for pluggable rendering backends
(e.g., matplotlib 3D, OpenGL, WebGL export) and expose its public API
through `__all__`.

## Key Classes

_None implemented._

## Dependencies

- **Internal**: Likely to depend on `spatial.coordinates.Point3D` and `Matrix4x4` once implemented
- **External**: None currently; may require `matplotlib` or a 3D rendering library

## Planned Scope (informational, not committed)

Future work may include scene graph construction, camera transforms, mesh
rendering, and export to common 3D formats. Any such implementation must:

- Accept `Point3D` and `Matrix4x4` from `spatial.coordinates` for geometry transforms.
- Raise `NotImplementedError` for unfinished rendering backends.
- Never silently return placeholder visualisation output.

## Constraints

- Zero-mock: real rendering data only, `NotImplementedError` for unimplemented paths.
- No silent fallbacks; failures must be explicit and logged.

## Error Handling

- All errors logged before propagation.
- Missing optional rendering dependencies must raise `ImportError` explicitly.

## Navigation

- **Self**: `SPEC.md`
- **Parent**: [../README.md](../README.md)
- **Readme**: [README.md](README.md)
- **Agents**: [AGENTS.md](AGENTS.md)
- **Repository Root**: [README.md](../../../../README.md)
