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three.py

Python 3D library

The aim of this project is to create an easy to use 3D library for Python.

This project was inspired by Three.js, and attempts to follow the effective and reliable class structure from that project whenever possible.

Three.py was originally designed for educational purposes, and rendering efficiency and optimization will occasionally be sacrificed for simplicity and clarity.

To see what the Three.py library is capable of, see the list of examples or watch the sample projects video.

Three.py video

This project was initially developed by Lee Stemkoski and Michael Pascale.

This project uses the MIT license.

Usage

Three.py uses the Python libraries PyGame, PyOpenGL, and NumPy.

The following code creates a scene, a camera, ambient and directional lights, and adds a light blue cube to the scene. It animates (spins) the cube, and allows the user to move the camera with first-person controls.

from core import *
from cameras import *
from lights import *
from geometry import *
from material import *

class TestCube(Base):
    
    def initialize(self):

        self.setWindowTitle('Cube')
        self.setWindowSize(800,600)

        self.renderer = Renderer()
        self.renderer.setViewportSize(800,600)
        self.renderer.setClearColor(0.25,0.25,0.25)
        
        self.scene = Scene()
        
        self.camera = PerspectiveCamera()
        self.camera.transform.setPosition(0, 1, 7)
        self.camera.transform.lookAt(0, 0, 0)
        self.cameraControls = FirstPersonController(self.input, self.camera)

        self.scene.add( AmbientLight(strength=0.25) )
        self.scene.add( DirectionalLight(direction=[-1,-1,-1]) )

        self.cube = Mesh( BoxGeometry(), SurfaceLightMaterial(color=[0.5,0.5,1.0]) )
        self.scene.add(self.cube)
        
    def update(self):
        
        self.cameraControls.update()

        if self.input.resize():
            size = self.input.getWindowSize()
            self.camera.setAspectRatio( size["width"]/size["height"] )
            self.renderer.setViewportSize(size["width"], size["height"])
                
        self.cube.transform.rotateX(0.02, Matrix.LOCAL)
        self.cube.transform.rotateY(0.03, Matrix.LOCAL)
        
        self.renderer.render(self.scene, self.camera)
                    
# instantiate and run the program
TestCube().run()

In case you are having difficulties related to versions of the dependencies (PyGame, PyOpenGL, NumPy), a pipenv pipfile is provided to set up a virtualenv. It can be used as follows:

pip install pipenv
pipenv install
pipenv shell
cd three.py
python TestAnimatedDayNight.py