# 55 - Lattice Deformation Tools (TASK-033)

**Date:** 2025-11-30
**Version:** 1.28.0
**Status:** Done

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## Summary

Implemented lattice deformation tools for non-destructive shape manipulation using control point cages. Essential for architectural structures (tapering towers), organic modeling, and animation.

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## Changes

### New Files Created

**Server-side (4 layers):**
- `server/domain/tools/lattice.py` - Abstract interface `ILatticeTool`
- `server/application/tool_handlers/lattice_handler.py` - RPC handler implementation
- `server/adapters/mcp/areas/lattice.py` - MCP tool definitions with semantic tags

**Blender Addon:**
- `blender_addon/application/handlers/lattice.py` - Blender API implementation

**Tests:**
- `tests/unit/tools/lattice/__init__.py`
- `tests/unit/tools/lattice/test_lattice_handler.py` - 19 unit tests
- `tests/e2e/tools/lattice/__init__.py`
- `tests/e2e/tools/lattice/test_lattice_tools.py` - E2E workflow tests

### Files Modified

- `server/infrastructure/di.py` - Added `get_lattice_handler()` provider
- `server/adapters/mcp/areas/__init__.py` - Added lattice import
- `blender_addon/__init__.py` - Added LatticeHandler and RPC registrations
- `tests/unit/conftest.py` - Added mathutils mock with MockVector class

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## Tools Implemented

| Tool | Semantic Tags | Description |
|------|---------------|-------------|
| `lattice_create` | `[OBJECT MODE][SCENE]` | Creates lattice object, auto-fits to target object bounds |
| `lattice_bind` | `[OBJECT MODE][NON-DESTRUCTIVE]` | Binds object to lattice via Lattice modifier |
| `lattice_edit_point` | `[OBJECT MODE]` | Moves lattice control points to deform bound objects |

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## Features

### lattice_create
- Auto-fit to target object bounding box with 5% margin
- Configurable resolution (points_u, points_v, points_w: 2-64)
- Interpolation types: KEY_LINEAR, KEY_CARDINAL, KEY_CATMULL_ROM, KEY_BSPLINE

### lattice_bind
- Non-destructive deformation via Lattice modifier
- Optional vertex group to limit affected vertices
- Validation of lattice type and vertex group existence

### lattice_edit_point
- Single or multiple point editing
- Relative (offset) or absolute positioning
- Point index calculation: `index = u + (v * points_u) + (w * points_u * points_v)`

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## Example: Eiffel Tower Tapering Workflow

```python
# 1. Create tower base
modeling_create_primitive(primitive_type="CUBE", name="Tower")
modeling_transform_object(name="Tower", scale=[0.5, 0.5, 3.0])

# 2. Create lattice fitted to tower
lattice_create(name="TowerLattice", target_object="Tower", points_u=2, points_v=2, points_w=4)

# 3. Bind tower to lattice
lattice_bind(object_name="Tower", lattice_name="TowerLattice")

# 4. Taper by moving top points inward
# For 2x2x4 = 16 points, top layer is indices 12-15
lattice_edit_point(lattice_name="TowerLattice", point_index=[12, 13, 14, 15], offset=[-0.3, -0.3, 0])
```

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## Testing

- **19 unit tests** - All passing
- **E2E tests** - Complete workflow tests (requires running Blender)
- **No regressions** - All 539 unit tests pass

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## RPC Commands

| Command | Handler Method |
|---------|----------------|
| `lattice.create` | `LatticeHandler.lattice_create` |
| `lattice.bind` | `LatticeHandler.lattice_bind` |
| `lattice.edit_point` | `LatticeHandler.lattice_edit_point` |

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## Related Tasks

- **TASK-033-1:** lattice_create ✅
- **TASK-033-2:** lattice_bind ✅
- **TASK-033-3:** lattice_edit_point ✅
