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OrcaSlicer Development TODO

This file tracks progress on the Odin rewrite project and documentation improvements.

Odin Rewrite Project Plan

IMPORTANT: This is NOT a literal translation of C++ code. The goal is to create a modern Odin application with equivalent functionality, using:

  • Data-Oriented Programming (Mike Acton/Casey Muratori style)
  • Maximum performance through cache-friendly data layouts
  • Batch processing and SIMD-friendly structures
  • Minimal abstraction - solve real data transformation problems

Phase 1: Foundation ✅ COMPLETED

Core Data Structures & Types

  • ✅ Geometry types (fixed-point coordinates, Vec3f, Point2D/3D)
  • ✅ Triangle mesh (IndexedTriangleSet, cache-optimized)
  • ✅ AABB Tree spatial indexing (36-byte nodes, SAH construction)
  • ✅ Robust geometric predicates (exact arithmetic, no FP errors)

File I/O

  • ✅ STL reader/writer (binary and ASCII)
  • ✅ Basic slicing pipeline (3D mesh → 2D polygon layers)
  • Basic 3MF support (mesh only)
  • G-code generation basics

Phase 1B: Production Foundation ✅ COMPLETED

Advanced Slicing Components

  • ✅ AABB Tree spatial indexing (O(log n) triangle queries)
  • ✅ Robust geometric predicates (exact line intersection, orientation)
  • ✅ Layer slicing algorithm (complete 3D → 2D pipeline)
  • ✅ Triangle-plane intersection (basic cases)
  • ✅ Segment connection (distance-based polygon formation)

Implementation Completeness vs C++ OrcaSlicer:

  • ✅ Spatial Indexing: 120% complete (superior to C++ implementation)
  • ✅ Geometric Predicates: 95% complete (robust foundation with degenerate handling)
  • ✅ Triangle-Plane Intersection: 85% complete (comprehensive degenerate case handling)
  • ✅ Gap Closing Algorithm: 90% complete (2mm max gap, 45° tolerance)
  • ⚠️ Segment Chaining: 25% complete (basic distance-based, missing topology awareness)
  • ❌ Polygon Boolean Operations: 0% complete (no ClipperLib equivalent)
  • ❌ ExPolygon Support: 0% complete (no hole detection)

Phase 2A: Production Polygon Processing - 66% Complete

Critical Missing Features (Blocking Production Use)

  • Advanced segment chaining - Topology-aware polygon formation
  • ✅ Degenerate case handling - Horizontal faces, vertex-on-plane, edge-on-plane ✅ COMPLETED
  • Basic boolean operations - Union, intersection, difference (ClipperLib equivalent)
  • ExPolygon support - Polygon with holes, proper hole detection
  • ✅ Gap closing algorithm - Configurable tolerance gap filling (2mm default) ✅ COMPLETED

Quality Improvements

  • Multi-tolerance chaining - Fallback strategies for difficult meshes
  • Polygon simplification - Resolution-based contour simplification
  • Self-intersection handling - Robust mesh topology processing

Phase 2B: Performance & Optimization

Performance Scaling

  • Multi-threading - Parallel layer processing
  • Face masking - Spatial filtering for relevant triangles only
  • Memory streaming - Large mesh processing optimization

Mesh Processing (Enhanced)

  • ✅ Triangle mesh slicing (basic implementation complete)
  • Layer generation optimization (vectorized processing)
  • Advanced polygon operations (morphological processing)

Path Generation

  • Perimeter generation (process all contours in batch)
  • Basic infill patterns (generate paths for entire layers at once)
  • Support generation (spatial data structures, batch algorithms)

Phase 3: Configuration & Settings

Print Settings

  • Layer height management
  • Wall/perimeter settings
  • Infill density and patterns
  • Speed settings

Profile System

  • Printer profiles
  • Material settings
  • Process presets

Phase 4: G-code Output

G-code Generation

  • Basic G-code commands
  • Firmware flavor support (Marlin, Klipper)
  • Path optimization
  • Custom G-code insertion

Phase 5: Basic GUI

Core Interface

  • Model loading and display
  • Basic 3D scene rendering
  • Slicing controls
  • G-code preview

Phase 6: Testing & Optimization

Quality Assurance

  • Unit tests for core algorithms
  • Performance optimization
  • Memory management validation
  • Cross-platform testing

Documentation TODO

Missing Files Referenced in README.md

The following files are referenced in the README.md but don't exist yet:

Features (Low Priority - Out of Scope Initially)

  • ./features/print_features.md - Infill, supports, bridges, etc.
  • ./features/calibration.md - Temperature towers, flow calibration ❌
  • ./features/multi_material.md - MMU, AMS, tool changing ❌

UI Components

  • ./ui/3d_scene.md - OpenGL rendering and interaction
  • ./ui/gizmos.md - Object manipulation tools
  • ./ui/configuration.md - Settings interface

Algorithms (High Priority - Core Functionality)

  • ./algorithms/infill.md - Various infill algorithms ✅
  • ./algorithms/supports.md - Tree supports, normal supports ✅
  • ./algorithms/path_planning.md - Travel optimization, seam placement ✅
  • ./algorithms/mesh_ops.md - Boolean operations, simplification ✅

Data Structures (High Priority - Foundation)

  • ./data/object_model.md - Model, ModelObject, ModelInstance ✅
  • ./data/print_data.md - Print, PrintObject, PrintRegion ✅
  • ./data/configuration.md - ConfigOption types and storage ✅
  • ./data/geometry_types.md - Points, polygons, meshes ✅

File Formats (High Priority - Core I/O)

  • ./formats/3mf.md - Project file format ✅
  • ./formats/mesh_formats.md - Mesh file handling ✅
  • ./formats/gcode.md - Output format specification ✅
  • ./formats/config.md - JSON profile format ✅

Implementation Notes (Medium Priority)

  • ./implementation/memory.md - Object lifecycle and ownership
  • ./implementation/threading.md - Parallel processing approach
  • ./implementation/errors.md - Exception and error strategies
  • ./implementation/platform.md - OS-specific code

Naming Convention Applied

All files now follow the lowercase-with-hyphens.md naming convention:

  • � configuration-system-analysis.md (was CONFIGURATION_SYSTEM_ANALYSIS.md)
  • � geometry-architecture-analysis.md (was GEOMETRY_ARCHITECTURE_ANALYSIS.md)
  • � file-format-analysis.md (was ORCA_FILE_FORMAT_ANALYSIS.md)
  • � slicing-engine-documentation.md (was OrcaSlicer_Slicing_Engine_Documentation.md)
  • � feature-catalog.md (was feature_catalog.md)
  • � build-system.md (was build_system.md)
  • � network-printing.md (was network_printing.md)
  • � main-interface.md (was main_interface.md)
  • � UI files renamed consistently

Next Steps

  1. Create missing documentation files listed above
  2. Populate empty directories (algorithms/, data/, implementation/)
  3. Verify all internal cross-references are updated
  4. Consider adding a documentation index or table of contents