cubicpy 0.1.4

A Python library for creating 3D basic shape models and animations with Physics.

CubicPy

日本語 | English

CubicPy - A 3D programming learning app for placing and building physics objects with code

Call it "CubicPy" - or simply "CuPy" for short!

Application Description

CubicPy is an application that allows you to place objects in 3D space using Python code and build worlds that operate with realistic physics simulations. You can freely place boxes, spheres, and other objects to create structures and learn programming while experiencing physical laws such as gravity and collisions.

The constructed objects and structures can be observed undergoing realistic collapse processes by tilting the ground using physics simulations. You can also change the gravity factor to observe physical behavior under different gravitational environments.

Installation

pip install cubicpy

Using the cubicpy Command

After installation, you can easily run from the command line:

# Run a randomly selected sample code
cubicpy

# Display help
cubicpy --help
cubicpy -h

# Display sample list
cubicpy --list
cubicpy -l

# Run a specific sample
cubicpy --example box_tower_sample
cubicpy -e box_tower_sample

# Run your own Python file
cubicpy my_script.py

# Run with modified gravity factor (specifies the power of 10 to multiply gravity by)
cubicpy --gravity -6 --example box_tower_sample
cubicpy -g -6 -e box_tower_sample

# Run with custom window size (1280x720)
cubicpy -e box_tower_sample -w 1280,720
cubicpy --window-size 1280,720 -e box_tower_sample

Sample Code Examples

Creating a Tower of Boxes (box_tower_sample.py)

# Create an array of object data
body_data = []

# Stack 10 levels of boxes
for i in range(10):
    body_data.append({
        'type': 'box',
        'pos': (0, 0, i),  # Position: x, y, z
        'scale': (1, 1, 1),  # Size: width, depth, height
        'color': (i/10, 0, 1-i/10),  # Color: red, green, blue (0-1)
        'mass': 1  # Mass (optional)
    })

Object Definition Details (for cubicpy command)

Details of object definitions to add to the body_data list:

Parameter	Description	Required	Default Value
type	Object type: 'box', 'sphere', 'cylinder'	Required	-
pos	Position coordinates (x, y, z)	Required	-
scale	Size (width, depth, height)	Optional	(1, 1, 1)
color	Color (red, green, blue) - values from 0 to 1	Optional	(0.5, 0.5, 0.5)
mass	Mass (0: fixed object)	Optional	1
color_alpha	Transparency (0: transparent to 1: opaque)	Optional	1
hpr	Rotation angles (heading, pitch, roll)	Optional	(0, 0, 0)
position_mode	Position reference	Optional	'corner_near_origin'

※ position_mode can be set to the following values:

• 'corner_near_origin': The corner nearest to the origin is the reference
• 'bottom_center': The center of the bottom surface is the reference
• 'gravity_center': The center of gravity is the reference

Building Worlds with the cubicpy Command

1. Create a Python file in the format of the sample
2. Run it with the cubicpy your_file.py command

Sample Code for API Mode

from cubicpy import CubicPyApp

# Instantiate
app = CubicPyApp(gravity_factor=-4)

# Adding individual objects
# Add objects using API
app.add_box(position=(0, 0, 0), scale=(1, 1, 1), color=(1, 0, 0))
app.add_sphere(position=(2, 0, 0),  scale=(1, 1, 1), color=(0, 1, 0))
app.add_cylinder(position=(4, 0, 0),  scale=(1, 1, 1), color=(0, 0, 1))

# Adding multiple objects (loop)
for i in range(10):
    app.add_box(
        position=(0, 5, i),
        color=(i/10, 0, 1-i/10)
    )

# Adding body_data for compatibility with cubicpy command
body_data = []
for i in range(10):
    body_data.append({
        'type': 'box',
        'pos': (0, 10, i),
        'scale': (1, 1, 1),
        'color': (i / 10, 0, 1 - i / 10),
        'mass': 1,
        'color_alpha': 1,
    })

app.from_body_data(body_data)

# Run simulation
app.run()

API Mode Method Details

CubicPyApp Class

CubicPyApp(code_file=None, gravity_factor=-6)

• code_file: Path to Python file to execute (optional)
• gravity_factor: Gravity factor (optional, default: -4)

Object Addition Methods

Adding a Box

add_box(position=(0, 0, 0), scale=(1, 1, 1), color=(0.5, 0.5, 0.5), mass=1, color_alpha=1)

• position: Position coordinates (x, y, z)
• scale: Size (width, depth, height)
• color: Color (red, green, blue) - values from 0 to 1
• mass: Mass (0: fixed object)
• color_alpha: Transparency (0: transparent to 1: opaque)

Adding a Sphere

add_sphere(position=(0, 0, 0), scale=(1, 1, 1), color=(0.5, 0.5, 0.5), mass=1, color_alpha=1)

• Parameters are the same as add_box

Adding a Cylinder

add_cylinder(position=(0, 0, 0), scale=(1, 1, 1), color=(0.5, 0.5, 0.5), mass=1, color_alpha=1)

• Parameters are the same as add_box

Building Objects from body_data List

from_body_data(body_data) 

• body_data: List of object definitions (dictionaries) as used by the cubicpy command

World Operation Methods

run()  # Build and run the world
reset()  # Reset the world

Building Worlds with API Mode

1. Create a CubicPyApp instance in your Python script
2. Add objects using methods like add_box(), add_sphere(), etc.
3. Call the run() method to build and run the world
4. If needed, use the reset() method to rebuild
5. Run with python your_script.py

Application Controls

• Arrow keys: Change camera angle
• Mouse wheel: Zoom in/out
• W/S/A/D: Tilt the ground
• F/G: Change gravity strength
• R: Reset
• F1: Toggle debug display
• ESC: Exit

Requirements

• Python 3.9 or higher
• Panda3D
• Panda3D-Bullet physics engine
• NumPy

These dependencies are automatically installed with pip install cubicpy.

Copyright

Released under the MIT License. See the LICENSE file for details.

Contribution

Bug reports and feature improvement suggestions are welcome via GitHub Issues or Pull Requests. New sample creation and documentation improvements are also welcome.

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Have fun learning programming with CubicPy!