cadquery-simpleviewer 0.2.3

A simple interactive 3D viewer for CadQuery models using Plotly

cadquery-simpleViewer

An interactive 3D viewer for CadQuery models, built on Plotly. Renders geometry directly inside Jupyter notebooks and Google Colab cells — no external software, no extensions, no server required.

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Features

• Interactive orbit, zoom and pan inside the notebook cell
• Supports CadQuery solids, edges, wires, cq.Vector points, and [x, y, z] lists — mixed in the same call
• Edge and wire rendering works with any curve type: straight lines, arcs, ellipses, splines, helices, B-splines
• Axes visibility toggles (X, Y, Z independently)
• Camera mode selector (Perspective / Orthographic)
• Optional ground plane at a chosen elevation
• Equal scale enforced across all three axes — 1 unit in X occupies the same screen distance as 1 unit in Y or Z
• Works in JupyterLab, VS Code notebooks, and Google Colab

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Installation

pip

pip install cadquery-simpleviewer

uv

uv add cadquery-simpleviewer

pixi (PyPI source)

pixi add --pypi cadquery-simpleviewer

Poetry

poetry add cadquery-simpleviewer

Note: cadquery-simpleviewer declares plotly as a dependency but intentionally does not pin cadquery itself — users typically manage their CadQuery installation separately (pip, conda, or the cadquery conda channel via pixi). See the CadQuery installation guide for details.

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Quick Start

import cadquery as cq
from cadquery_simpleviewer import show

box = cq.Workplane("XY").box(5, 3, 2)
show(box)

Multiple objects with names and colors

box      = cq.Workplane("XY").box(5, 3, 2)
cylinder = cq.Workplane("XY").cylinder(6, 1).translate((8, 0, 0))

show(
    [box, cylinder],
    names=["Box", "Cylinder"],
    colors=["lightsteelblue", "indianred"]
)

With a ground plane

show(
    [box, cylinder],
    names=["Box", "Cylinder"],
    z=0,
    plane_color="gainsboro",
    plane_size=20
)

Clean presentation (axes hidden)

show(
    [box, cylinder],
    names=["Box", "Cylinder"],
    visible_axes=None,
    z=0,
    plane_color="whitesmoke",
    plane_size=20
)

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Displaying Edges and Wires

show() accepts cq.Edge and cq.Wire objects alongside solids. Any curve type is supported — the geometry is sampled along the curve using positionAt(t), so the result faithfully follows arcs, splines, helices, and B-splines.

Straight edge

edge = cq.Edge.makeLine(cq.Vector(0, 0, 0), cq.Vector(5, 0, 0))
show(edge)

Arc

arc = cq.Edge.makeCircle(radius=3.0)
show(arc, lines_display=dict(color="steelblue", width=3, samples=100))

Helix

helix = cq.Wire.makeHelix(pitch=1.0, height=5.0, radius=2.0)
show(helix, lines_display=dict(color="seagreen", samples=200))

Mixed solids and curves

box  = cq.Workplane("XY").box(5, 3, 2)
arc  = cq.Edge.makeCircle(radius=4.0)
wire = cq.Wire.makeRect(6.0, 4.0)

show(
    [box, arc, wire],
    names=["Box", "Arc", "Rectangle"],
    lines_display=dict(color="indianred", width=2)
)

Customising line appearance

Pass a lines_display dict to control the line style. All keys are optional.

show(
    helix,
    lines_display=dict(
        color="steelblue",
        width=3,
        mode="lines+markers",
        samples=150,
        opacity=0.8
    )
)

lines_display key	Default	Description
color	"red"	Line color — any CSS name or hex. See Plotly CSS colors
width	2	Line width in pixels
mode	"lines"	"lines" or "lines+markers"
samples	50	Number of points sampled along each edge. Increase for tight arcs, helices, or complex splines
opacity	1.0	Line opacity — 0.0 to 1.0

Choosing samples: straight lines need only 2, a full circle looks smooth at 50–100, and a helix with many turns may need 200 or more. When in doubt, start high and reduce if performance is a concern.

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Displaying Points

show() accepts cq.Vector objects and [x, y, z] lists alongside any other object type. Points are rendered as Scatter3d markers — no tessellation involved.

Single point

show(cq.Vector(2.5, 0, 1))

# List notation
show([2.5, 0, 1])

Points from edge division

def divide_edge(edge, n):
    points = []
    for i in range(n + 1):
        t = i / n
        points.append(edge.positionAt(t))
    return points

edge   = cq.Edge.makeLine(cq.Vector(-5, 0, 0), cq.Vector(5, 0, 0))
points = divide_edge(edge, 8)

show(points, names=["P" + str(i) for i in range(len(points))])

Mixed solids and points

box    = cq.Workplane("XY").box(5, 3, 2)
corner = cq.Vector(2.5, 1.5, 1.0)

show(
    [box, corner],
    names=["Box", "Corner"],
    points_display=dict(size=8, color="red", symbol="diamond")
)

Customising point appearance

points_display key	Default	Options
size	5	Any integer (pixels)
color	"red"	Any CSS color name or hex — see Plotly CSS colors
symbol	"circle"	"circle", "circle-open", "square", "diamond", "cross", "x"
opacity	1.0	0.0 – 1.0

points_display and lines_display apply uniformly to all points and lines in the call respectively.

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Google Colab

Install at the top of the notebook, then use normally:

import sys
IN_COLAB = "google.colab" in sys.modules
if IN_COLAB:
    !pip install cadquery cadquery-simpleviewer

import cadquery as cq
from cadquery_simpleviewer import show

box = cq.Workplane("XY").box(5, 3, 2)
show(box)

The viewer renders inline as an interactive Plotly figure. No extensions or widget managers are needed.

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show() Reference

show(
    objects,
    names=None,
    colors=None,
    opacity=1.0,
    visible_axes="xyz",
    z=None,
    plane_color="whitesmoke",
    plane_size=50,
    plane_opacity=0.8,
    tessellation_tolerance=0.01,
    padding=0.15,
    points_display=None,
    lines_display=None,
)

Parameters

Parameter	Type	Default	Description
objects	object or list	—	Any mix of CadQuery Workplane, cq.Edge, cq.Wire, cq.Vector, or [x, y, z] lists
names	list of str	None	Legend label for each object. Defaults to "Object 1", "Object 2", …
colors	list of str	None	Face color for each mesh object. Accepts CSS color names and hex. See Plotly CSS colors. Defaults to a built-in palette
opacity	float	1.0	Surface opacity for mesh objects. 1.0 = fully opaque
visible_axes	str or None	"xyz"	Initial axes visibility. None hides all axes. Valid values: None, "x", "y", "z", "xy", "xz", "yz", "xyz"
z	float or None	None	Elevation of the ground plane. None = no plane drawn
plane_color	str	"whitesmoke"	Color of the ground plane
plane_size	float	50	Half-side length of the ground plane quad
plane_opacity	float	0.8	Opacity of the ground plane
tessellation_tolerance	float	0.01	Mesh precision for solid → triangle conversion. Smaller = finer, slower
padding	float	0.15	Fraction of the bounding box span added as margin on each axis
points_display	dict or None	None	Marker style for point objects. Keys: size, color, symbol, opacity
lines_display	dict or None	None	Line style for edge and wire objects. Keys: color, width, mode, samples, opacity

Interactive controls

Control	Action
X ● / X ○	Toggle X axis on or off
Y ● / Y ○	Toggle Y axis on or off
Z ● / Z ○	Toggle Z axis on or off
Camera	Switch between Perspective and Orthographic projection
Left drag	Orbit
Scroll	Zoom
Right drag	Pan

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Pixi environment example

[workspace]
channels = ["cadquery", "conda-forge"]
name = "my_project"
platforms = ["win-64", "osx-arm64", "osx-64", "linux-64"]

[dependencies]
python = "3.12.*"
cadquery = "*"
ipykernel = ">=6"

[pypi-dependencies]
cadquery-simpleviewer = "*"

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Repository

https://github.com/255ribeiro/cadquery-simpleViewer

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License

MIT