TiaCAD - Declarative Parametric CAD in YAML

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TiaCAD - Declarative Parametric CAD in YAML

Version: 3.1.2 (Production Ready + CI/Docs Complete ✅) Status: Production - All tests passing, documentation complete, Apache 2.0 licensed Current: v3.1.2 features: CI fixes, comprehensive documentation, licensing & packaging ready Released: v3.0.0 on Nov 19, 2025 | v3.1.0 on Nov 11 | v3.1.1 on Nov 16 | v3.1.2 on Dec 2, 2025 Breaking Changes: None in v3.1.x (backward compatible)

🎉 v3.1.2 Status: PRODUCTION READY! All features complete:

v3.0 Foundation:

✅ Unified SpatialRef dataclass (position + orientation)

✅ SpatialResolver with comprehensive reference resolution

✅ Auto-generated part-local references (e.g., base.face_top)

✅ Local frame offsets for intelligent positioning

v3.1 Enhancements:

✅ Visual regression testing framework (50+ tests)

✅ Complete cone primitive support across all backends

✅ Accurate origin tracking after transforms

✅ Full XZ/YZ plane support for loft operations

✅ Comprehensive testing utilities (1080+ total tests, 92% coverage)

✅ Terminology standardization and visual documentation

See RELEASE_NOTES_V3.md for complete details and docs/MIGRATION_GUIDE_V3.md for upgrade instructions.

Part of the Semantic Infrastructure Lab

TiaCAD is a production component of the Semantic Infrastructure Lab (SIL) — building the semantic substrate for intelligent systems.

Role in the Semantic OS

Semantic OS Architecture
├── Layer 1: Kernel (TIA orchestration, Beth knowledge, Gemma provenance)
├── Layer 2: Domain Modules
│   └── TiaCAD ← Geometric/CAD reasoning
├── Layer 3: Tools (reveal, Scout)
└── Layer 4: Interfaces

TiaCAD provides:

Geometric Reasoning - Declarative 3D solid modeling
Parametric Design - Mathematical relationships in physical space
Spatial Composition - Reference-based assembly without hierarchies
Verifiable CAD - Deterministic, testable geometry (1025 tests, 92% coverage)

What Makes TiaCAD Unique in SIL

CAD for the Semantic Age - TiaCAD is not just another CAD tool. It's the first CAD system designed from the ground up as a semantic artifact.

Key Innovation: Reference-Based Composition

Traditional CAD uses hierarchical parent-child assemblies. TiaCAD uses peer parts with spatial anchors:

# Parts are PEERS, not nested
parts:
  base:
    primitive: box
    parameters: {width: 100, height: 5, depth: 100}

  pillar:
    primitive: cylinder
    parameters: {radius: 5, height: 50}

operations:
  # Composition via SPATIAL REFERENCES (not parent-child)
  pillar_positioned:
    type: transform
    input: pillar
    transforms:
      - translate:
          to: base.face_top  # Semantic anchor, auto-generated!

Why this matters:

✅ Parts are independently testable (no coupling)
✅ Explicit dependencies (no hidden hierarchies)
✅ Composable like functions (orchestrated by TIA, not embedded)
✅ Semantic, not just geometric

SIL Principles in Action

TiaCAD exemplifies all core SIL principles through concrete implementations:

1. Progressive Disclosure

Orient → Navigate → Focus at multiple levels:

# LEVEL 1: ORIENT - What designs exist?
ls examples/                    # See all available designs

# LEVEL 2: NAVIGATE - What's in this design?
reveal guitar_hanger.yaml       # Structure: metadata, parameters, parts, operations

# LEVEL 3: FOCUS - Show specific part
reveal guitar_hanger.yaml --range 45-75  # Just the hook definition

Future (v3.1 DAG): Progressive disclosure for dependencies:

tiacad build widget.yaml --deps-summary    # LEVEL 1: "23 parts, 45 ops"
tiacad build widget.yaml --show-deps       # LEVEL 2: Dependency graph
tiacad build widget.yaml --watch --param w # LEVEL 3: Live tracking

2. Composability

Parts compose via references, not nesting:

TiaCAD generates geometry
reveal explores structure
tia beth finds similar patterns
scout reviews quality (future)

All tools work together, not bundled in a monolith.

3. Clarity + Simplicity

Explicit YAML (not implicit magic) + Declarative (not procedural):

# Explicit origins, parameters, references
box:
  primitive: box        # Explicit type
  parameters:
    width: 10          # Named dimensions
    height: 10         # (not [10,10,10])
    depth: 10
  origin: center       # Explicit origin

4. Verifiability

1025 tests ensure correctness:

Deterministic: Same YAML → Same geometry (always)
Testable: Parameters, operations, dimensions verified
Reproducible: Version-controlled designs

Learn More

📖 Complete SIL Integration Guide - Deep dive into:

How TiaCAD embodies each SIL principle (with examples)
Integration patterns (TiaCAD + reveal, TiaCAD + Beth, etc.)
Future vision (semantic constraints, Pantheon integration)
Why reference-based composition matters for AI systems

Quick Links: SIL Manifesto • Design Principles • Project Index

Quick Start

# Install dependencies
pip install -r requirements.txt

# Run full test suite (1080+ tests passing, 100%)
python3 -m pytest tiacad_core/tests/

# Generate coverage report
python3 -m pytest tiacad_core/tests/ --cov=tiacad_core --cov-report=html

# Try an example - create a smooth transition using loft
tiacad build examples/transition_loft.yaml

# See the generated 3MF file (modern format)
ls -lh *.3mf

What You Get:

Declarative YAML syntax for 3D CAD
Parameters with expressions (${width * 2})
Primitives (box, cylinder, sphere, cone)
Sketch operations (extrude, revolve, sweep, loft)
Boolean operations (union, difference, intersection)
Pattern operations (linear, circular, grid)
Finishing operations (fillet, chamfer)
Schema validation with helpful error messages
Automatic 3MF export (modern format) + STEP and STL support

What is TiaCAD?

TiaCAD is a declarative parametric CAD system that lets you design 3D models using YAML instead of code. It's built on top of CadQuery and focuses on:

Readability: YAML syntax anyone can understand
Explicit behavior: No hidden defaults or magic
Composability: Build complex assemblies from simple parts
Verifiability: Comprehensive test coverage ensures correctness
Quality: Professional code quality with extensive validation

TiaCAD's Design Philosophy: Reference-Based Composition

How is TiaCAD different? Unlike traditional CAD (SolidWorks, Fusion 360) which uses hierarchical parent-child assemblies, TiaCAD uses a reference-based composition model:

🎯 Key Concepts:

Independent parts: Parts aren't nested in assembly hierarchies - they're all peers
Spatial anchors: Position parts using reference points (we call them "anchors")
Auto-generated references: Every part automatically provides attachment points (.face_top, .center, etc.)
Declarative: Describe what you want ("put this on top of that"), not step-by-step instructions
No parent-child relationships: Parts reference positions, not other parts

Think of it as marking spots on a workbench where things go, rather than building nested folders of sub-assemblies.

vs Traditional CAD:

Traditional CAD (SolidWorks)	TiaCAD (Reference-Based)
Hierarchical assemblies	Flat parts with anchors
Parent-child relationships	Independent parts
Mate constraints	Spatial references
Assembly → Sub-assembly → Part	Part → Part → Part (peers)
"Connect this to that"	"Position this at that anchor"

vs Procedural Tools (OpenSCAD):

OpenSCAD (Procedural)	TiaCAD (Declarative)
Step-by-step instructions	Describe desired result
Execution order matters	Declaration order flexible
`translate([0,0,10]) cylinder(...)`	`translate: to: base.face_top`
Manual coordinate calculation	Auto-generated anchors

Why this matters: Once you understand the reference-based model, positioning becomes intuitive: "place the cap on the pillar's top face" rather than calculating coordinates manually.

Visual Guide: See Reference-Based vs Hierarchical for a detailed visual comparison.

See also: GLOSSARY.md for term definitions, AUTO_REFERENCES_GUIDE.md for anchor details.

Example: Parametric Bottle (Revolve Operation)

parameters:
  bottle_height: 100
  bottle_radius: 30
  neck_radius: 10

sketches:
  bottle_profile:
    plane: XZ
    origin: [0, 0, 0]
    shapes:
      - type: polygon
        points:
          - [0, 0]                              # Bottom center
          - ["${bottle_radius}", 0]              # Bottom edge
          - ["${bottle_radius}", 70]             # Body top
          - ["${neck_radius}", 80]               # Neck start
          - ["${neck_radius}", "${bottle_height}"] # Neck top
          - [0, "${bottle_height}"]              # Top center

operations:
  bottle:
    type: revolve
    sketch: bottle_profile
    axis: Z
    angle: 360

Result: Smooth bottle shape created by revolving a 2D profile around an axis.

Example: Smooth Transition (Loft Operation)

sketches:
  base_square:
    plane: XY
    origin: [0, 0, 0]
    shapes:
      - type: rectangle
        width: 40
        height: 40

  top_circle:
    plane: XY
    origin: [0, 0, 30]
    shapes:
      - type: circle
        radius: 15

operations:
  transition:
    type: loft
    profiles: [base_square, top_circle]
    ruled: false  # Smooth blending

Result: Organic transition from square base to circular top.

Example: auto-generated anchors (New in v3.0!)

v3.0 introduces auto-generated references that eliminate manual coordinate calculations:

parts:
  # Base platform
  platform:
    primitive: box
    parameters:
      width: 100
      height: 5
      depth: 100

  # Pillar automatically positioned on top
  pillar:
    primitive: cylinder
    parameters:
      radius: 5
      height: 50
    translate:
      to: platform.face_top  # Auto-generated reference!

  # Cap positioned with offset from pillar top
  cap:
    primitive: box
    parameters:
      width: 15
      height: 5
      depth: 15
    translate:
      to:
        from: pillar.face_top  # Auto-generated reference!
        offset: [0, 0, 2]      # 2 units above pillar

Benefits:

No manual reference definitions needed
{part}.face_top, {part}.center, {part}.axis_z auto-generated for every part
Offsets follow local coordinate frames for intuitive positioning
Full orientation support (normals, tangents) for intelligent placement

See: examples/auto_references_box_stack.yaml and docs/MIGRATION_GUIDE_V3.md

Project Structure

tiacad/
├── tiacad_core/
│   ├── Core Components
│   │   ├── part.py                    # Part representation (19 tests ✅)
│   │   ├── selector_resolver.py       # Selector resolution (31 tests ✅, 100% cov)
│   │   ├── transform_tracker.py       # Transform tracking (21 tests ✅)
│   │   ├── point_resolver.py          # Point resolution (36 tests ✅)
│   │   └── sketch.py                  # 2D sketch system (25 tests ✅)
│   │
│   ├── parser/                        # YAML Parser System (Phase 1-3)
│   │   ├── tiacad_parser.py           # Main parser (16 tests ✅)
│   │   ├── parameter_resolver.py      # Expression resolver (33 tests ✅)
│   │   ├── parts_builder.py           # Parts builder (22 tests ✅)
│   │   ├── operations_builder.py      # Operations dispatcher (15 tests ✅)
│   │   ├── boolean_builder.py         # Boolean ops (32 tests ✅)
│   │   ├── pattern_builder.py         # Pattern ops (40 tests ✅)
│   │   ├── finishing_builder.py       # Finishing ops (38 tests ✅)
│   │   ├── sketch_builder.py          # Sketch builder (Phase 3)
│   │   ├── extrude_builder.py         # Extrude operation (6 tests ✅)
│   │   ├── revolve_builder.py         # Revolve operation (4 tests ✅)
│   │   ├── sweep_builder.py           # Sweep operation (4 tests ✅)
│   │   ├── loft_builder.py            # Loft operation (6 tests ✅)
│   │   └── schema_validator.py        # YAML schema validation (32 tests ✅)
│   │
│   ├── validation/                    # Assembly validation
│   │   └── assembly_validator.py      # Part references (19 tests ✅)
│   │
│   ├── exporters/                     # 3D file export
│   │   └── threemf_exporter.py        # 3MF format (31 tests ✅)
│   │
│   ├── tests/                         # 609 comprehensive tests ✅
│   │   ├── test_parser/               # Parser tests (Phase 1-3)
│   │   ├── test_validation/           # Validation tests
│   │   ├── test_exporters/            # Export tests
│   │   └── test_*.py                  # Component tests
│   │
│   └── utils/                         # Utilities
│       ├── exceptions.py              # Error handling (19 tests ✅)
│       └── geometry.py                # Geometry utilities
│
├── examples/                          # Working YAML examples
│   ├── transition_loft.yaml           # Loft example (square→circle)
│   ├── rounded_mounting_plate.yaml    # Fillet example
│   ├── chamfered_bracket.yaml         # Chamfer example
│   └── ...
│
├── output/                            # Generated STL/3MF files
├── htmlcov/                           # Coverage report (84%)
├── docs/                              # Comprehensive documentation
└── README.md                          # This file

Core Components

Phase 1: Foundation (100% Complete ✅)

1. Part System (19 tests ✅)

CadQuery Workplane wrapper with position tracking
Transform history for debugging
Part registry for complex assemblies

2. SelectorResolver (31 tests ✅, 100% coverage)

Face/edge selection (">Z", "|X")
Combinators (and, or, not)
Comprehensive test coverage
Clear error messages

3. TransformTracker (21 tests ✅)

Sequential transform application
Rotation origin resolution
Rodrigues rotation (exact, arbitrary axes)

4. PointResolver (36 tests ✅)

Absolute coordinates: [x, y, z]
Dot notation: "part.face('>Z').center"
Offset expressions

5. ParameterResolver (33 tests ✅)

Expression evaluation: ${width * 2}
Nested parameters
Math operations (+, -, *, /, **, %)

6. Sketch System (25 tests ✅)

2D profile creation (rectangle, circle, polygon)
Multiple shapes per sketch
Parameter resolution in sketches

Phase 2: Operations (100% Complete ✅)

7. YAML Parser (16 tests ✅)

Complete YAML → STL/3MF pipeline
Metadata, parameters, parts, sketches, operations, export
End-to-end integration
Schema validation

8. PartsBuilder (22 tests ✅)

Primitives: box, cylinder, sphere, cone
Origin modes: center, corner, custom
Transform application

9. BooleanBuilder (32 tests ✅)

Union: combine parts
Difference: subtract parts
Intersection: find overlap
Multi-part operations

10. PatternBuilder (40 tests ✅)

Linear patterns (1D, 2D, 3D)
Circular patterns (bolt circles, gears)
Grid patterns (arrays)
Parameter expressions

11. FinishingBuilder (38 tests ✅)

Fillet: round edges with radius
Chamfer: bevel edges (uniform/asymmetric)
Edge selection: direction, parallel, perpendicular
Multiple operations per part

Phase 3: Sketch Operations (100% Complete ✅)

12. ExtrudeBuilder (6 tests ✅)

Extrude 2D sketches along direction
Distance and both-directions support
Draft angles for manufacturability
Parameter expressions

13. RevolveBuilder (4 tests ✅)

Revolve profiles around axis (X, Y, or Z)
Full (360°) or partial angles
Custom axis specification
Rotationally symmetric parts

14. SweepBuilder (4 tests ✅)

Sweep profile along path
Straight and curved paths
Complex pipe and rail shapes
Path point arrays

15. LoftBuilder (6 tests ✅)

Blend between multiple profiles
Smooth or ruled surfaces
Organic shape creation
Multi-profile transitions

16. SchemaValidator (32 tests ✅)

YAML schema validation against JSON schema
Comprehensive error messages
Field-level validation
Type checking

17. AssemblyValidator (19 tests ✅)

Part reference validation
Circular dependency detection
Missing part detection
Operation validation

18. 3MF Exporter (31 tests ✅)

3D Manufacturing Format export
Color and material preservation
Multi-part assemblies
Production-ready output

v3.1: Testing Confidence (Phase 1 Complete ✅)

19. Testing Utilities (71 tests ✅) - NEW in v3.1

Measurement utilities: distance, dimensions, bounding boxes
Orientation utilities: rotation angles, normals, alignment
Dimension utilities: volume, surface area calculations
Full documentation with examples

20. Correctness Tests (60+ tests ✅) - NEW in v3.1

Attachment correctness: 16 tests (zero-distance, face-to-face, patterns)
Rotation correctness: 19 tests (angles, normals, transform composition)
Dimensional accuracy: 25 tests (primitives, volumes, boolean operations)
Comprehensive verification of YAML → 3D translation

Quality Assurance

Test Coverage

Overall: 1025+ tests, 87% code coverage, 100% pass rate (all passing, 0 skipped)

New in v3.1: 131+ testing confidence tests

Testing utility tests: 71 tests (measurement, orientation, dimension utilities)
Correctness tests: 60+ tests (attachment, rotation, dimensional accuracy)

By Component:

Selector resolution: 100% coverage ✨
Exception handling: 100% coverage
Part system: 99% coverage
Sketch system: 95% coverage
Parameter resolution: 95% coverage
Boolean operations: 93% coverage
Color parsing: 93% coverage

Code Quality

Tools Used:

Ruff: Modern Python linter (all checks passing ✅)
Pylint: Code quality analysis (major issues resolved ✅)
pytest-cov: Coverage analysis (84% overall)
mypy-ready: TYPE_CHECKING imports for type safety

Quality Improvements:

Removed unused imports
Fixed type hints (TYPE_CHECKING pattern)
Enhanced error messages with context
Consistent code style
Comprehensive docstrings

Testing Strategy

Test Types:

Unit Tests: Fast, isolated component tests
Integration Tests: Real CadQuery validation
Error Case Tests: Comprehensive error handling
Regression Tests: Prevent bugs from returning
Real-World Examples: Practical use case validation

Development Roadmap

Phase 1: Foundation (100% Complete ✅)

Part representation (19 tests)
Selector resolution (31 tests, 100% coverage)
Transform tracking (21 tests)
Point resolution (36 tests)
Parameter resolution (33 tests)
YAML parser (16 tests)

Deliverable: YAML → STL pipeline functional ✅

Phase 2: Operations (100% Complete ✅)

Boolean operations (32 tests)
Pattern operations (40 tests)
Finishing operations (38 tests)
Parts builder (22 tests)
Operations integration (15 tests)
Real-world examples (6+ working)

Deliverable: Production-ready parametric CAD system ✅

Phase 3: Sketch Operations (100% Complete ✅)

2D sketch system (25 tests)
Extrude operation (6 tests)
Revolve operation (4 tests)
Sweep operation (4 tests)
Loft operation (6 tests)
Schema validation (32 tests)
Assembly validation (19 tests)
3MF export (31 tests)
Quality improvements (609 total tests, 84% coverage)

Deliverable: Complete CAD system with sketch-based modeling ✅

What's Next?

v3.1 Phase 2: Visual Regression Testing 🎯

Duration: 8-10 weeks (Q2 2026) Status: Phase 1 Complete (testing utilities + 131+ tests)

Remaining Phase 1 Tasks:

Complete pytest marker CI integration
Push coverage to 90% target
Final release preparation for v3.1.0

Phase 2 Features (Q2 2026):

Visual regression framework using trimesh + matplotlib
Reference images for 40+ examples
50+ visual regression tests
Automated visual diff reporting in CI

v3.2: Dependency Graph (DAG) - Future Milestone

Duration: 6-8 weeks Goal: True parametric modeling with incremental rebuilds

Features:

ModelGraph using networkx for dependency tracking
Incremental rebuild (10x faster for parameter changes)
--watch mode for auto-rebuild on YAML changes
--show-deps command for graph visualization

Target: v3.2.0 release (Q3 2026)

v3.3: Explicit Constraints

Duration: 4-6 weeks Dependencies: DAG (v3.2) complete

Features:

Constraint YAML schema (flush, coaxial, offset)
Manual constraint specification (user sets positions)
Constraint validation and conflict detection
Integration with ModelGraph

Target: v3.3.0 release (Q4 2026)

Known Limitations & Future Roadmap

Current Limitations

TiaCAD v3.1 is production-ready with comprehensive testing, but has some architectural limitations that are planned for future phases:

1. Position-Only References (High Priority)

Current PointResolver only returns position (x, y, z)
No orientation data (normals, directions, frames)
Impact: Cannot do align_to_face or mate_axes operations
Workaround: Manual rotation calculations
Planned Fix: Phase 3 (12-16 weeks) - SpatialResolver with full orientation support

2. No Dependency Graph (High Priority)

Sequential execution only - must rebuild entire model on parameter changes
Impact: Slow iteration on complex models
Workaround: Keep models under 200 lines, use parameters
Planned Fix: Phase 4a (6-8 weeks) - DAG with incremental rebuilds (10x faster)

3. No Constraint System (High Priority)

No sketch constraints or assembly constraints
Impact: Manual positioning required for assemblies
Workaround: Use reference-based positioning with named anchors
Planned Fix: Phase 4b (4-6 weeks) - Explicit constraints, Phase 5 (12-16 weeks) - Constraint solver

4. CadQuery Coupling (Medium Priority)

90% of code directly calls CadQuery (backend abstraction exists but not enforced)
Impact: Cannot easily swap geometry kernels
Decision: Continue with CadQuery, enforce abstraction in new code only

See: docs/KNOWN_ISSUES.md for complete details, workarounds, and roadmap.

Future Roadmap

Total Timeline to Constraint-Based CAD: ~40-50 weeks (10-12 months)

Phase 3: Named Geometry & Orientation (12-16 weeks) - Next Major Milestone

SpatialResolver with face/edge/axis support
Frame-based transforms
align_to_face operation
Intent-based modeling ("align to face" vs raw coordinates)

Phase 4a: Dependency Graph (DAG) (6-8 weeks)

Incremental rebuilds (10x faster for parameter changes)
--watch mode for auto-rebuild
Circular dependency detection

Phase 4b: Explicit Constraints (4-6 weeks)

Declarative constraints (flush, coaxial, offset)
Constraint validation and conflict detection
Manual specification (user sets positions)

Phase 5: Constraint Solver (12-16 weeks) - Post-1.0

Automatic constraint satisfaction
Symbolic solver (SymPy) for simple cases
Numeric solver (scipy.optimize) for assemblies
Full constraint-based CAD (like SolidWorks/Fusion360)

See: docs/TIACAD_EVOLUTION_ROADMAP.md for complete strategic plan.

Advanced Features (v4.0+)

Constraints & Assemblies:

Attachment constraints (mate, align, coincide)
Multi-part assemblies with relationships
Named constraint patterns
Assembly collision detection

Advanced Operations:

Shell/offset operations
Advanced fillets (variable radius, blend)
Text/engraving
Imported sketches (DXF, SVG)

Export & Integration:

Additional formats (STEP, IGES, DXF)
CAM integration (toolpaths, g-code)
Bill of materials (BOM) generation
Assembly instructions

Phase 5: Tooling & Polish (Future)

Design Principles

1. Explicit Origins (No Magic)

Problem: Default rotation behavior causes confusion Solution: REQUIRE explicit rotation origins in YAML

# ❌ REJECTED - ambiguous behavior
- rotate: {angle: 45, axis: Z}

# ✅ ACCEPTED - explicit origin
- rotate: {angle: 45, axis: Z, origin: current}
- rotate: {angle: 45, axis: Z, origin: [0, 0, 0]}
- rotate: {angle: 45, axis: Z, origin: "beam.face('>Y').center"}

2. Sequential Transforms (Order Matters)

Transforms apply top-to-bottom. Order matters!

# These produce DIFFERENT results:
transforms:
  - translate: [10, 0, 0]  # Move THEN rotate
  - rotate: {angle: 90, axis: Z, origin: [0,0,0]}

transforms:
  - rotate: {angle: 90, axis: Z, origin: [0,0,0]}  # Rotate THEN move
  - translate: [10, 0, 0]

3. Test-Driven Development

Every component has comprehensive tests:

Unit tests with mocks (fast iteration)
Integration tests with real CadQuery (validation)
Error case coverage (robustness)
Real-world use cases (practical verification)

Result: 609 tests, 84% coverage, high confidence in correctness

4. Quality First

Code quality tools (ruff, pylint)
Type safety (TYPE_CHECKING imports)
Comprehensive error messages
Clear documentation
Professional code standards

Documentation

User Documentation

Getting Started:

TUTORIAL.md - Step-by-step introduction
GLOSSARY.md - Terminology and concepts
EXAMPLES_GUIDE.md - Detailed example walkthroughs

Reference:

YAML_REFERENCE.md - Complete syntax reference
AUTO_REFERENCES_GUIDE.md - Spatial anchors guide
docs/CLI.md - Command-line interface

Migration:

MIGRATION_GUIDE_V3.md - Upgrading from v0.3.0
RELEASE_NOTES_V3.md - What's new in v3.0

Technical Documentation

Architecture & Design:

docs/ARCHITECTURE_DECISION_V3.md - v3.0 design rationale
docs/MENTAL_MODELS_AND_LANGUAGE.md - Language design exploration
docs/SKETCH_ABSTRACTION_DESIGN.md - Sketch system design
docs/CLEAN_ARCHITECTURE_PROPOSAL.md - Architecture principles

Testing:

docs/TESTING_GUIDE.md - Testing strategies
docs/TESTING_ROADMAP.md - Test coverage plans
docs/TESTING_QUICK_REFERENCE.md - Quick test commands

Project Planning:

docs/TIACAD_EVOLUTION_ROADMAP.md - Overall project roadmap
docs/KNOWN_ISSUES.md - Known limitations and improvement plans
docs/LANGUAGE_IMPROVEMENTS_STATUS.md - Documentation improvement tracking
docs/V3_IMPLEMENTATION_STATUS.md - Feature implementation status
docs/CURRENT_STATUS.md - Project health snapshot

Testing

Run All Tests

# Run full test suite
pytest tiacad_core/tests/ -v

# Quick run
pytest tiacad_core/tests/ -q

# With coverage
pytest tiacad_core/tests/ --cov=tiacad_core --cov-report=html

# Coverage opens in browser
open htmlcov/index.html

Run Specific Components

# Selector tests (31 tests, 100% coverage)
pytest tiacad_core/tests/test_selector_resolver.py -v

# Sketch operation tests (22 tests)
pytest tiacad_core/tests/test_parser/test_sketch_operations.py -v

# Schema validation tests (32 tests)
pytest tiacad_core/tests/test_parser/test_schema_validation.py -v

# Boolean operation tests (32 tests)
pytest tiacad_core/tests/test_parser/test_boolean_builder.py -v

# NEW in v3.1: Testing utilities (71 tests)
pytest tiacad_core/tests/test_testing/ -v

# NEW in v3.1: Correctness tests (60+ tests)
pytest tiacad_core/tests/test_correctness/ -v

# Run by category (requires pytest markers)
pytest -m attachment  # Attachment correctness tests
pytest -m rotation    # Rotation correctness tests
pytest -m dimensions  # Dimensional accuracy tests

Code Quality Checks

# Run ruff (fast linter)
ruff check tiacad_core/

# Run pylint (comprehensive analysis)
pylint tiacad_core/ --disable=C0103,C0114,C0115,C0116

# Type checking (if using mypy)
mypy tiacad_core/ --strict

Current Status Summary

Phase Completion

Phase	Status	Components	Tests	Coverage	Pass Rate
Phase 1: Foundation	✅ 100%	6/6	131 tests	High	100%
Phase 2: Operations	✅ 100%	5/5	139 tests	High	100%
Phase 3: Sketch Ops	✅ 100%	7/7	124 tests	High	100%
v3.0 Complete	✅ Complete	-	502 tests	95%+	100%
v3.1 Phase 1	✅ Complete	3/3	131 tests	High	100%
Total	✅ Production	21/21	1025+ tests	87%	100%

Component Breakdown

Component	Tests	Coverage	Status	Notes
Phase 1: Foundation
Part System	19	99%	✅	Position tracking
SelectorResolver	31	100%	✅	Perfect coverage!
TransformTracker	21	86%	✅	Transform composition
PointResolver	36	87%	✅	Dot notation
ParameterResolver	33	95%	✅	Expressions
Sketch System	25	95%	✅	2D profiles
Phase 2: Operations
YAML Parser	16	84%	✅	End-to-end
PartsBuilder	22	94%	✅	Primitives
BooleanBuilder	32	93%	✅	Union/diff/intersect
PatternBuilder	40	88%	✅	Linear/circular/grid
FinishingBuilder	38	89%	✅	Fillet/chamfer
Phase 3: Sketch Operations
ExtrudeBuilder	6	60%	✅	Extrude profiles
RevolveBuilder	4	57%	✅	Rotation symmetry
SweepBuilder	4	58%	✅	Path following
LoftBuilder	6	75%	✅	Profile blending
SchemaValidator	32	71%	✅	YAML validation
AssemblyValidator	19	70%	✅	Reference checking
3MF Exporter	31	97%	✅	Manufacturing format
Quality
Error Messages	19	100%	✅	Exception handling
v3.1: Testing Confidence
Testing Utilities	71	N/A	✅	Test helper modules
Correctness Tests	60	N/A	✅	Verification tests
Total	740	87%	✅	Production-ready

Real-World Examples

✅ Multiple working examples, all export to STL/3MF:

Basic Examples:

simple_box.yaml - Primitive shapes
simple_guitar_hanger.yaml - Transforms
guitar_hanger_with_holes.yaml - Boolean ops

Pattern Examples: 4. mounting_plate_with_bolt_circle.yaml - Circular patterns

Finishing Examples: 5. rounded_mounting_plate.yaml - Fillet edges 6. chamfered_bracket.yaml - Chamfer edges

Sketch Operation Examples: 7. transition_loft.yaml - Loft (square→circle) 8. bottle_revolve.yaml - Revolve profiles 9. pipe_sweep.yaml - Sweep along path

What Works:

Complete YAML → STL/3MF pipeline ✅
Parametric expressions ✅
All primitives ✅
All sketch operations ✅
All boolean operations ✅
All pattern types ✅
Professional finishing ✅
Schema validation ✅
Comprehensive error messages ✅
Production-ready quality ✅

Contributing

This is an active development project with stable core components and production-ready quality.

Quality Standards:

Test First: All features require comprehensive tests
Code Quality: Pass ruff and pylint checks
Coverage: Aim for >80% test coverage
Documentation: Update README and docstrings

Development Principles:

Explicit Behavior: No implicit defaults
Real Validation: Test with real CadQuery
Error Messages: Clear, helpful error messages
Type Safety: Use proper type hints

License

Apache 2.0 - see LICENSE for details

Acknowledgments

Built with:

CadQuery: Powerful parametric 3D CAD library
pytest: Comprehensive testing framework
ruff: Lightning-fast Python linter
pytest-cov: Code coverage measurement

Last Updated: 2025-12-01 Session: claude/recent-completion-summary-011CV2cv5x8jFFVCFp4qoHXh Status: v3.1 Phase 1 Complete - Testing Confidence Foundation Tests: 1025+/1025+ passing (100% pass rate, 0 skipped) Coverage: 87% overall (target: 90% for v3.1 final) Quality: Ruff + Pylint validated, comprehensive testing + correctness verification Examples: 24+ working YAML files → STL/3MF exports New: 131+ testing confidence tests (measurement, orientation, dimensions, correctness)

Name		Name	Last commit message	Last commit date
Latest commit History 76 Commits
.github/workflows		.github/workflows
docs		docs
examples		examples
scripts		scripts
tiacad_core		tiacad_core
.gitignore		.gitignore
CHANGELOG.md		CHANGELOG.md
CODE_QUALITY_SUMMARY.md		CODE_QUALITY_SUMMARY.md
LICENSE		LICENSE
PROJECT.md		PROJECT.md
README.md		README.md
RELEASE_NOTES_V3.md		RELEASE_NOTES_V3.md
SKIPPED_TESTS_AUDIT.md		SKIPPED_TESTS_AUDIT.md
pyproject.toml		pyproject.toml
pytest.ini		pytest.ini
requirements.txt		requirements.txt
tiacad		tiacad
tiacad-schema.json		tiacad-schema.json

License

Semantic-Infrastructure-Lab/tiacad

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TiaCAD - Declarative Parametric CAD in YAML

Part of the Semantic Infrastructure Lab

Role in the Semantic OS

What Makes TiaCAD Unique in SIL

SIL Principles in Action

1. Progressive Disclosure

2. Composability

3. Clarity + Simplicity

4. Verifiability

Learn More

Quick Start

What is TiaCAD?

TiaCAD's Design Philosophy: Reference-Based Composition

Example: Parametric Bottle (Revolve Operation)

Example: Smooth Transition (Loft Operation)

Example: auto-generated anchors (New in v3.0!)

Project Structure

Core Components

Phase 1: Foundation (100% Complete ✅)

Phase 2: Operations (100% Complete ✅)

Phase 3: Sketch Operations (100% Complete ✅)

v3.1: Testing Confidence (Phase 1 Complete ✅)

Quality Assurance

Test Coverage

Code Quality

Testing Strategy

Development Roadmap

Phase 1: Foundation (100% Complete ✅)

Phase 2: Operations (100% Complete ✅)

Phase 3: Sketch Operations (100% Complete ✅)

What's Next?

v3.1 Phase 2: Visual Regression Testing 🎯

v3.2: Dependency Graph (DAG) - Future Milestone

v3.3: Explicit Constraints

Known Limitations & Future Roadmap

Current Limitations

Future Roadmap

Advanced Features (v4.0+)

Phase 5: Tooling & Polish (Future)

Design Principles

1. Explicit Origins (No Magic)

2. Sequential Transforms (Order Matters)

3. Test-Driven Development

4. Quality First

Documentation

User Documentation

Technical Documentation

Testing

Run All Tests

Run Specific Components

Code Quality Checks

Current Status Summary

Phase Completion

Component Breakdown

Real-World Examples

Contributing

License

Acknowledgments

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