Parametrix

CAD as code for open-hardware

a JavaScript solution for creating 3D shapes

Parametrix workflow

Simplistic approach:
- contour centric (i.e. 2.5D)
  - cost efficient manufacturing process are 2D
  - robust mechanisms are 2D
- no long workflow chain
		

Generate 3D files

> a JavaScript solution for creating 3D shapes

> a frontend that abstract the CAD solution

> a generator of WebUI for parametrizing your designs

Parametrix main advantages:

1. Durability of your 3D modeling
    1.1. Parametrix is small (10k LoC)
    1.2. Parametrix is open-source
    1.3. An abstraction of several/many API of CAD-tools
        Keep your design agnostic to CAD vendors (no lock-in)

2. Guide your design for cost efficient digital manufacturing
    Generate contours made out of lines and arcs of circles
        as supported by G-code

3. Clear and structured interface between designer and manufacturer
    one HTML page with parametrization, 2D preview and 3D export

4. A javacript API
    Creating your 3D modelling recipes with javascript
		

Parametrix in condensed

framework / eco-system : Parametrix

          core library : Geometrix

      design-libraries : Designix, Desi78, Desi82, ...
		

Go through the design-UI
		

The Geometrix API for designing a 3D shape
		

The Geometrix API in a nutshell
		

Code example

const ctr1 = contour(0, 0)
	.addSegStrokeR(param.L2, 0)
	.addSegStrokeRP(a3, param.L3)
	.addPointAP(a4, param.L4)
	.addSegArc(param.R34, true, true)
	.addCornerRounded(param.R4)
	.addPointA(0, param.L5)
	.addSegArc3(a5, false)
	.closeSegStroke();
		

3 types of parameters
- number
- checkbox (i.e. boolean)
- dropdown (i.e. enum)
		

Create contour with:
- strokes
- arcs of circles

Optimal for generating G-code
		

Next destination-point in contour-definition:
- Cartesian or Polar
- Relative or Absolute
		

3 options for defining an arc of circle:
- radius with large/small and ccw/cw
- intermediate point
- tangent at the begining or the end
		

Complex curve approximation:
Double arcs defined with start and end tangents
		

Corner rework:
- Rounded
- Widened
- WideAcc
		

 

- Define a list of figures
- Attach the contours to figures
    - as main, second or dynamics
		

Define the 3D shape
- Extrude figures as LinearOrtho or Rotate
- Rotate, translate and combine sub-element
    - Union
    - Intersection
    - Substraction

Parametrix generates 3D scripts for:
- OpenSCAD ✔
- OpenJsCad ✔
- Freecad ✔
- SolveSpace
- pythonOCC
- CadQuery
- OpenCascade.js
- Three.js
- glTF
- X3D
- ManifoldCAD
		

   End of
     the
presentation
     of
 Parametrix
		

Ready for creating your own design-library?
		

npm create parametrix@latest tom07