# BrepRs Development Roadmap
## Project Overview
BrepRs is a Rust implementation of boundary representation (BRep) for CAD/CAE/CAM applications. This roadmap outlines the development stages and milestones for the project.
## Overall Objective
- **Language**: Rust
- **Target**: Complete implementation of boundary representation (BRep) for CAD/CAE/CAM applications
- **API Compatibility**: Provide API compatibility with industry-standard CAD libraries
- **External Behavior**:
- Consistent API design with industry standards
- Memory-safe implementation using Rust's ownership system
- High performance for CAD operations
- Comprehensive feature set for geometric modeling
## Development Principles
### Core Design Principles
1. **Memory Safety**: Leverage Rust's ownership system for memory safety
2. **Performance**: Optimize for CAD operations and large models
3. **API Clarity**: Provide a clean, intuitive API for geometric modeling
4. **Extensibility**: Design for easy extension and customization
5. **Compatibility**: Support standard CAD file formats
---
## Stage 0: Foundation Layer (Must be done first)
### 0.1 Basic Types and Utilities
**Objectives:**
- Establish fundamental types and utilities
- Implement memory management system
- Create exception handling framework
**Tasks:**
- Basic types (`Standard_Integer`, `Standard_Real`, `Standard_Boolean`)
- Memory management utilities
- Exception handling system
- Smart pointer implementation
**Deliverables:**
- Basic type system foundation
- Memory management utilities
- Error handling framework
### 0.2 Collection Types
**Objectives:**
- Implement essential collection types
- Ensure performance for CAD operations
**Tasks:**
- `NCollection_List`
- `NCollection_Array1`
- `NCollection_Map`
- `NCollection_DataMap`
**Deliverables:**
- Complete collection library
- Ready for geometric classes implementation
---
## Stage 1: Geometric Kernel
### 1.1 Geometric Primitives
**Objectives:**
- Implement core geometric primitives
- Ensure mathematical precision
**Tasks:**
- Points, vectors, directions
- Coordinate systems and transformations
- Matrices and quaternions
- Geometric operations (distance, angle, etc.)
**Deliverables:**
- Complete geometric primitive library
- Foundation for advanced geometry
### 1.2 2D Geometry
**Objectives:**
- Implement 2D curve types
- Support curve operations
**Tasks:**
- Lines, circles, ellipses
- Bezier and NURBS curves
- Curve operations and intersections
**Deliverables:**
- Complete 2D geometry library
- Curve operation utilities
### 1.3 3D Geometry
**Objectives:**
- Implement 3D surface types
- Support surface operations
**Tasks:**
- Planar, cylindrical, spherical surfaces
- Bezier and NURBS surfaces
- Surface operations and intersections
**Deliverables:**
- Complete 3D geometry library
- Surface operation utilities
**Stage 1 Output:**
- Comprehensive geometric API
---
## Stage 2: Topological Kernel
### 2.1 Topological Types
**Objectives:**
- Implement topological shape hierarchy
- Support shape type system
**Tasks:**
- Shape types: vertex, edge, wire, face, shell, solid
- Topological structure implementation
- Location and transformation support
**Deliverables:**
- Complete topological type system
- Shape hierarchy implementation
### 2.2 Boundary Representation (BRep)
**Objectives:**
- Implement BRep structure
- Bind topology to geometry
**Tasks:**
- BRep structure implementation
- Parametric curves and surfaces
- Topology-geometry binding
**Deliverables:**
- Complete BRep implementation
- Topology-geometry integration
### 2.3 Shape Traversal Tools
**Objectives:**
- Implement shape traversal utilities
- Support shape exploration
**Tasks:**
- Shape explorer implementation
- Sub-shape traversal
- Topological analysis tools
**Deliverables:**
- Complete traversal tools
- Shape analysis utilities
**Stage 2 Output:**
- Comprehensive topological kernel
---
## Stage 3: Modeling Algorithms
### 3.1 Primitive Creation
**Objectives:**
- Implement basic solid primitives
- Support parametric creation
**Tasks:**
- Box, sphere, cylinder, cone, torus
- Prisms and revolutions
- Parametric primitive creation
**Deliverables:**
- Complete primitive creation API
- Parametric modeling support
### 3.2 Shape Construction
**Objectives:**
- Implement manual shape building
- Support low-level construction
**Tasks:**
- Vertex, edge, wire, face creation
- Shell, solid, compound construction
- Advanced shape building tools
**Deliverables:**
- Complete construction API
- Low-level building utilities
### 3.3 Boolean Operations
**Objectives:**
- Implement boolean operations
- Ensure algorithm correctness
**Tasks:**
- Fuse, cut, common, section
- Boolean operation optimization
- Robustness improvements
**Deliverables:**
- Complete boolean operations
- Reliable geometric algorithms
### 3.4 Fillet and Chamfer
**Objectives:**
- Implement fillet and chamfer operations
- Support edge and face operations
**Tasks:**
- Edge filleting
- Face chamfering
- Advanced rounding operations
**Deliverables:**
- Complete fillet/chamfer API
- Surface finishing tools
### 3.5 Offset Operations
**Objectives:**
- Implement offset operations
- Support thickening and pipe creation
**Tasks:**
- Surface offsetting
- Thick solid creation
- Pipe and shell operations
**Deliverables:**
- Complete offset API
- Advanced surface operations
**Stage 3 Output:**
- Comprehensive modeling algorithm library
---
## Stage 4: Data Exchange
### 4.1 STL Support
**Objectives:**
- Implement STL file I/O
- Support both text and binary formats
**Tasks:**
- STL reader/writer
- Format validation
- Mesh optimization
**Deliverables:**
- Complete STL I/O
- Mesh processing utilities
### 4.2 STEP Support
**Objectives:**
- Implement STEP file I/O
- Support standard APs
**Tasks:**
- STEP AP203 / AP214 support
- Entity mapping
- File validation
**Deliverables:**
- Complete STEP I/O
- Standard format support
### 4.3 IGES Support
**Objectives:**
- Implement IGES file I/O
- Support standard entities
**Tasks:**
- IGES reader/writer
- Entity mapping
- Format validation
**Deliverables:**
- Complete IGES I/O
- Legacy format support
**Stage 4 Output:**
- Comprehensive file format support
---
## Stage 5: Mesh Generation
**Objectives:**
- Implement mesh generation
- Support various mesh types
**Tasks:**
- Mesh data structures
- 2D triangle meshing
- 3D tetrahedral meshing
- Mesh quality optimization
**Deliverables:**
- Complete mesh module
- Mesh generation utilities
---
## Stage 6: Visualization
**Objectives:**
- Implement rendering capabilities
- Support interactive display
**Tasks:**
- Graphics primitives
- OpenGL/WGPU integration
- Interactive objects
- View control and manipulation
**Deliverables:**
- Complete visualization system
- Interactive CAD display
---
## Stage 7: Application Framework
**Objectives:**
- Implement document framework
- Support parametric modeling
**Tasks:**
- Data framework
- Document management
- Standard attributes
- Topological naming and history
**Deliverables:**
- Complete application framework
- Parametric modeling support
---
## Stage 8: Testing and Validation
**Objectives:**
- Implement comprehensive testing
- Ensure correctness and robustness
**Tasks:**
- Unit tests
- Integration tests
- Performance benchmarks
- Stress testing
**Deliverables:**
- Complete test suite
- Validation framework
---
## Minimal Development Order
Follow this order for optimal development:
1. Basic types and utilities
2. Geometric primitives
3. Topological kernel
4. BRep implementation
5. Modeling algorithms
6. Data exchange
7. Mesh generation
8. Visualization
9. Application framework
10. Testing and validation
---
## Success Criteria
- **Memory Safety**: No memory leaks or unsafe operations
- **Performance**: Competitive with existing CAD libraries
- **Feature Completeness**: Comprehensive BRep implementation
- **API Clarity**: Clean, intuitive interface
- **File Format Support**: Standard CAD format compatibility
- **Testing**: Comprehensive test coverage
- **Documentation**: Complete API documentation
---
## Project Structure
```
breprs/
├── src/
│ ├── foundation/ # Stage 0: Basic types and utilities
│ ├── collections/ # Stage 0.2: Collection types
│ ├── geometry/ # Stage 1: Geometric kernel
│ ├── topology/ # Stage 2: Topological kernel
│ ├── modeling/ # Stage 3: Modeling algorithms
│ ├── exchange/ # Stage 4: Data exchange
│ ├── mesh/ # Stage 5: Mesh generation
│ ├── visualization/ # Stage 6: Visualization
│ └── framework/ # Stage 7: Application framework
├── tests/
│ ├── unit/ # Unit tests
│ ├── integration/ # Integration tests
│ └── performance/ # Performance tests
└── examples/ # Example code
```
---
## Notes
- All source code comments must be in English
- All documentation must be in English
- Follow Rust naming conventions
- Use Rust's type system to enforce safety where possible
- Prioritize performance for CAD operations
- Design for extensibility and customization