Recommandé
Contenu connexe
Similaire à From Code to Coffee Table with Blender and Sly
Similaire à From Code to Coffee Table with Blender and Sly (20)
Dernier
Dernier (20)
From Code to Coffee Table with Blender and Sly
- 1. From Code to Coffee Table with Blender and Sly Matt Meshulam ChiPy 2015-03-12
- 2. About Me By day - Developer Experience at Member of Pumping Station: One Side projects involving electronics, music, woodworking, Python, cooking, visual art
- 8. Conception CNC enables novel construction methods that require unique, high precision parts. Fabrication tools exist, but what about upstream design tools? I want a new coffee table.
- 9. Fabrication Software ● Vectric VCarve - Convert vector images to G-code toolpaths ● ShopBot software - Calibrate axes and run G-code on the ShopBot G-code (yuck!)
- 10. Metropol Parasol, Seville, Spain
- 11. Study 1: ShopBotsaurus Rex Pattern via http://www.instructables.com/id/Build-a-6-0-tall-Wooden-T-Rex-Model/
- 12. Study 2: Design composeable parts Create a 3D model in Blender Use 123D Make to convert model into fab- able parts
- 13. Blender model
- 14. 123D Make
- 16. Autodesk 123D Make :-) ● Free ● Designed for CNC construction ● Many cool built-in features :-( ● Unstable ● GUI only ● Hard to extend
- 17. A better design tool? ● Artistic/exploratory workflow ● Precise and reproducible operations ● Output in a useful format (2D vector shapes) ● Aware of physical 3D concepts (e.g. intersection)
- 18. Existing programmatic CAD tools OpenSCAD FreeCAD PythonOCC Cadquery
- 19. Why Blender? ● Intended for artistic uses ● Awesome Python API ● Large user base ● Open source
- 20. Why NOT Blender? ● It’s not CAD ● Mesh-based ● Poor support for physical construction
- 21. A Quick Tour of Blender
- 22. bpy - Main Blender Python module Programmatic equivalent of the GUI Highly imperative - Operations apply to the global selection context Great for macros/automation, not for complex apps
- 23. A bpy operation - No arg for what you’re resizing!
- 24. bmesh - Low level mesh interface Meshes are Python objects A BMesh object contains: - Vertices - Edges (2 verts) - Faces (3+ verts)
- 25. bmesh (cont’d) Users must ensure mesh consistency Tightly coupled to C data structures - be careful directly modifying mesh data!
- 27. bmesh.ops - BMesh Operations Most GUI (bpy) ops have underlying BMesh implementations (Mostly) well documented
- 29. Blender’s classes for 3D math: Matrix, Vector, etc. Available as a standalone module mathutils
- 30. Wait, what are we trying to do again?
- 31. Wait, what are we trying to do again?
- 32. Introducing Sly A Python library for 3D construction from 2D parts Uses Blender for I/O, but fairly decoupled Only ~350 SLoC
- 33. Two core concepts Slice - A 2D polygon (with thickness) positioned in 3D space. Cut - Material to be removed from a slice so it can interlock with another slice
- 34. Let’s see it in action!
- 36. Mirroring and smoothing - Blender mesh modifiers
- 37. Specify slice locations and orientations
- 38. Extract slices from selected mesh Apply an operation to each one Add slices to vector output and Blender scene
- 40. Rendered slices include cutouts
- 43. Sly implementation Extracting slices from a model:
- 44. Sly implementation (cont’d) Shapely - http://toblerity.org/shapely/ ● Great polygon library ● GIS-focused but general purpose ● Support for geometric operations: intersections, unions, etc. ● Slices use Shaply polygons internally
- 45. Sly Roadmap ● Installer, tests, docs ● Command line operation ● Better Blender GUI integration ● Smart slice placement ● Output to G-code? ● Different construction modes?
- 46. Want more? In-depth sessions at PS:1 starting in April, email me to get notified: matt@meshul.am Contribute on GitHub: github.com/meshulam/sly