Jupyter-CadQuery

View CadQuery objects in JupyterLab or in a standalone viewer for any IDE

Click on the "launch binder" icon to start Jupyter-CadQuery on binder:

Overview

Release 3 is a complete rewrite of Jupyter-CadQuery: While the selection of pythreejs and JupyterLab's sidecar looked reasonable in 2019, it turned out they had too many limitations. pythreejs is stuck with an outdated version of threejs and the sidecar project did not improve usability to a level I would have liked to have.

Jupyter-CadQuery is now a 3 layer project:

three-cad-viewer This is the complete CAD viewer written in Javascript with threejs being the only dependency. There is are a bunch of live examples and an API documentation.
cad-view-widget A thin layer on top of cad-viewer-widget that wraps the CAD viewer into an ipywidget. The API documentation can be found here
jupyter-cadquery (this repository) The actual CadQuery viewer, collecting and tessellating CadQuery objects, using cad-view-widget to visualize the objects. It was written with the intent to be as compatible with Jupyter-CadQuery 2.x as reasonable.

Note: For changes see the migration section at the end of this page.

Key Features

CadQuery support
- CadQuery >= 2.1 including master (as of 2021-04)
- CadQuery Assemblies
- CadQuery Sketch class for both show and replay
- Auto display of CadQuery shapes
STEP files
- A STEP reader to load STEP files into CadQuery Assemblies preserving hierarchy, names and colors
Viewing options:
- Directly in the JupyterLab output cell
- In a central Jupyterlab sidecar for any JupyterLab cell
- As a standalone viewer for use from any IDE
Animations (see examples below)
- Support Manual Assemblies with animation of model
- Animated explode mode for CadQuery assemblies
Debugging
- Step-by-step in an IDE with the standalone viewer (see example below)
- Visually
  - by displaying selected CadQuery faces and edges
  - by replaying steps of the rendered object in the Notebook (see example below)
Viewer features
- Toggle visibility of shapes and edges
- Orthographic and perspective view
- Clipping with max 3 clipping planes (of free orientation)
- Transparency mode
- Double click on shapes shows bounding box info
- Click on tree labels shows bounding box info and optionally hides or isolates the sub tree

Release v3.5.2 (03.01.2023)

Changes

Default python now is 3.10
Add support for Compounds with mixed shape types
Aligned show_object with CQ-Editor (e.g. support options dict)
Improved build123d support
Add support for my private Alg123d library (a thin facade on top of build123d to remove all implicit behavior and give control back to the user)

Fixes

OCCT bug with helix: If height = 2 * pitch, GCPnts_QuasiUniformDeflection returns 2 points only. Jupyter CadQuery detects this and uses GCPnts_QuasiUniformAbscissa instead

Examples

Animation system in JupyterLab

Self programmed animation
Explode objects animation

Source of STEP file: https://print.grabcad.com/library/quadruped-robot-w-code-1#!

Debugging

In VS Code with Standalone Viewer
- The top half is the CadQuery code being debugged in VS Code
- The bottom half is the standalone viewer in a browser window
- The show command in the code will tessellate the objects and send them via zmq to the standalone viewer
By replaying in the notebook

Installation

Using conda

For using Jupyter-CadQuery in Jupyterlab
- If you don't have it already, create a new conda environment with the latest CadQuery (e.g. master)
```
conda create -n jcq3 -c conda-forge -c cadquery python=3.10 cadquery=master vtk=9.2.2
conda activate jcq3
```
- Install Jupyter-CadQuery (note, matplotlib is only used for the examples)
```
pip install jupyter-cadquery==3.5.2 cadquery-massembly==1.0.0 matplotlib
```
  Windows users should also install pywin32 again with conda to ensure it is configured correctly
```
conda install pywin32
```
- Start Jupyter-CadQuery
```
conda activate jcq3
jupyter lab
```
- If you use the dark theme of JuypterLab, add the following code in the first cell of your notebook:
```
[1]: from jupyter_cadquery import set_defaults, open_viewer
     set_defaults(theme="dark")
     open_viewer("CadQuery")
```

For running Jupyter-CadQuery as standalone viewer

Start the browser based viewer

conda activate jcq3
jcv [-w width] [-h height]     # light theme
jcv [-w width] [-h height] -d  # dark theme

Use it from an IDE: In your code import the show or show_object function from the viewer:
```
import cadquery as cq
from jupyter_cadquery.viewer.client import show, show_object
obj = cq. ...
show(obj) # or show_object(obj)
```
show works as in JupyterLab, while show_object views objects incrementally as in CQ-Editor

Using a docker image

For using Jupyter-CadQuery in Jupyterlab
- Start Jupyter-Cadquery
```
WORKDIR=/tmp/jupyter
mkdir -p "$WORKDIR"  # this has to exist, otherwise an access error will be thrown
docker run -it --rm -v $WORKDIR:/home/cq -p 8888:8888 bwalter42/jupyter_cadquery:3.5.2
```
  Jupyter in the container will start in directory /home/cq
- To start with examples, you can
  - omit the volume mapping and just run docker run -it --rm -p 8888:8888 bwalter42/jupyter_cadquery:3.5.2 or
  - copy the example notebooks to your $WORKDIR. They will be available for Jupyter-CadQuery in the container.
- If you want to change the Dockerfile, make docker will create a new docker image
For running Jupyter-CadQuery as standalone viewer
- Start the browser based viewer (eventually add cli options, see notes below):
```
docker run -it --rm -p 8888:8888 --name jcq -p 5555:5555 bwalter42/jupyter_cadquery:3.5.2 -v
```
- In your code import the show or show_object function from the viewer:
```
import cadquery as cq
from jupyter_cadquery.viewer.client import show, show_object
obj = cq. ...
show(obj) # or show_object(obj)
```
  show works as in JupyterLab, while show_object views objects incrementally as in CQ-Editor
- Execute your code using the Python interpreter located in the container:
```
docker exec -i jcq bash -c ". /opt/conda/bin/activate cq; python" < my_project.py
```

Notes:

To simplify port forwarding, the viewer in the docker container also starts with port 8888 (and not with voila's default port 8866)
Port 5555 (the zmq port) needs to be forwarded. The show of the viewer client will send cad objects to this port
Use -d for dark mode and -w, -h to set dimensions of the CAD viewer

Demo Notebooks

A run through of all features
Standard CadQuery examples in Jupyter CadQuery
An OCP example (the OCC bottle)
CadQuery Sketch support
Animated MAssembly examples:
- Jupyter notebooks
- IDE plus Viewer:

Usage

a) Show objects

**show(cad_objs, **kwargs)**

Positional arguments args:

cad_objs: Comma separated list of cadquery objects;

Keywork arguments kwargs:

Display options
- viewer: Name of the sidecar viewer (default=None)
- anchor: How to open sidecar: "right", "split-right", "split-bottom", ... (default="right")
- cad_width: Width of CAD view part of the view (default=800)
- tree_width: Width of navigation tree part of the view (default=250)
- height: Height of the CAD view (default=600)
- theme: Theme "light" or "dark" (default="light")
- pinning: Allow replacing the CAD View by a canvas screenshot (default=True in cells, else False)
Tessellation options
- angular_tolerance: Shapes: Angular deflection in radians for tessellation (default=0.2)
- deviation: Shapes: Deviation from linear deflection value (default=0.1)
- edge_accuracy: Edges: Precision of edge discretization (default=None, i.e. mesh quality / 100)
- default_color: Default face color (default=(232, 176, 36))
- default_edge_color: Default edge color (default="#707070")
- optimal_bb: Use optimal bounding box (default=False)
- render_normals: Render the vertex normals (default=False)
- render_edges: Render edges (default=True)
- render_mates: Render mates (for MAssemblies, default=False)
- mate_scale: Scale of rendered mates (for MAssemblies, default=1)
Viewer options
- control: Use trackball controls ('trackball') or orbit controls ('orbit') (default='trackball')
- up: Use z-axis ('Z') or y-axis ('Z') as up direction for the camera, legacy behaviour: 'L' (default='Z')
- axes: Show axes (default=False)
- axes0: Show axes at (0,0,0) (default=False)
- grid: Show grid (default=[False, False, False])
- ticks: Hint for the number of ticks in both directions (default=10)
- ortho: Use orthographic projections (default=True)
- transparent: Show objects transparent (default=False)
- black_edges: Show edges in black (default=False)
- position: Absolute camera position that will be scaled (default=None)
- quaternion: Camera rotation as quaternion (x, y, z, w) (default=None)
- target: Camera target to look at (default=None)
- zoom: Zoom factor of view (default=2.5)
- reset_camera: Reset camera position, rotation and zoom to default (default=True)
- zoom_speed: Mouse zoom speed (default=1.0)
- pan_speed: Mouse pan speed (default=1.0)
- rotate_speed: Mouse rotate speed (default=1.0)
- ambient_intensity: Intensity of ambient light (default=0.75)
- direct_intensity: Intensity of direct lights (default=0.15)
- show_parent: Show the parent for edges, faces and vertices objects
- tools: Show the viewer tools like the object tree (default=True)
- timeit: Show rendering times, levels = False, 0,1,2,3,4,5 (default=False)
- js_debug: Enable debug output in browser console (default=False)
Not supported any more:
- mac_scrollbar: The default now
- bb_factor: Removed
- display: Use 'viewer=""' (for sidecar display) or 'viewer=None' (for cell display)
- quality: Use 'deviation'to control smoothness of rendered edges

b) Manage default values

set_defaults(**kwargs): allows to globally set the defaults value so they do not need to be provided with every show call

kwargs:
- see show
get_default(value): Get the global default for a single value
get_defaults(): Get all global defaults
reset_defaults(): Reset all defaults back to its initial value

c) Replay objects

Note, this is not supported in the standalone viewer for the time being.

replay(args)

Argument args:
- cad_obj: cadquery object
- index (default=0): Element in the fluent API stack to show
- debug (default=False): Trace building the replay stack
- cad_width (default=600): Width of the CAD view
- height (default=600): Height of the CAD view

d) Exports:

Export as PNG:

Display your object via
```
cv = show(a1)
```
and adapt the cad view as wanted (camera location, axis, transparency, ...).

Then call
```
cv.export_png("example.png")
```
Export as HTML:

Display your object without using a sidecar (set viewer to None) via
```
cv = show(a1, viewer=None)
```
and adapt the cad view as wanted (camera location, axis, transparency, ...).

Then call
```
cv.export_html()
```
Note: This does not work with viewers in sidecars!
Export as STL:

For CadQuery objects use CadQuery export functions. For PartGroups the following code can be used:
```
from jupyter_cadquery.export import exportSTL

exportSTL(
  part_group, "pg.stl", tolerance=quality, angular_tolerance=angular_tolerance
)
```
Smaller linear_deflection and angular_deflection means more details.