panda3d/samples/solar-system/step5_complete_solar_system.py

#!/usr/bin/env python

# Author: Shao Zhang and Phil Saltzman
# Last Updated: 2015-03-13
#
# This tutorial is intended as a initial panda scripting lesson going over
# display initialization, loading models, placing objects, and the scene graph.
#
# Step 5: Here we put the finishing touches on our solar system model by
# making the planets move. The actual code for doing the movement is covered
# in the next tutorial, but watching it move really shows what inheritance on
# the scene graph is all about.

from direct.showbase.ShowBase import ShowBase
base = ShowBase()

from direct.gui.DirectGui import *
from panda3d.core import TextNode
import sys


class World(object):

    def __init__(self):
        # This is the initialization we had before
        self.title = OnscreenText(  # Create the title
            text="Panda3D: Tutorial 1 - Solar System",
            parent=base.a2dBottomRight, align=TextNode.A_right,
            style=1, fg=(1, 1, 1, 1), pos=(-0.1, 0.1), scale=.07)

        base.setBackgroundColor(0, 0, 0)  # Set the background to black
        base.disableMouse()  # disable mouse control of the camera
        camera.setPos(0, 0, 45)  # Set the camera position (X, Y, Z)
        camera.setHpr(0, -90, 0)  # Set the camera orientation
        #(heading, pitch, roll) in degrees

        # Here again is where we put our global variables. Added this time are
        # variables to control the relative speeds of spinning and orbits in the
        # simulation
        # Number of seconds a full rotation of Earth around the sun should take
        self.yearscale = 60
        # Number of seconds a day rotation of Earth should take.
        # It is scaled from its correct value for easier visability
        self.dayscale = self.yearscale / 365.0 * 5
        self.orbitscale = 10  # Orbit scale
        self.sizescale = 0.6  # Planet size scale

        self.loadPlanets()  # Load and position the models

        # Finally, we call the rotatePlanets function which puts the planets,
        # sun, and moon into motion.
        self.rotatePlanets()

    def loadPlanets(self):
        # This is the same function that we completed in the previous step
        # It is unchanged in this version

        # Create the dummy nodes
        self.orbit_root_mercury = render.attachNewNode('orbit_root_mercury')
        self.orbit_root_venus = render.attachNewNode('orbit_root_venus')
        self.orbit_root_mars = render.attachNewNode('orbit_root_mars')
        self.orbit_root_earth = render.attachNewNode('orbit_root_earth')

        # The moon orbits Earth, not the sun
        self.orbit_root_moon = (
            self.orbit_root_earth.attachNewNode('orbit_root_moon'))

        ###############################################################

        # Load the sky
        self.sky = loader.loadModel("models/solar_sky_sphere")
        self.sky_tex = loader.loadTexture("models/stars_1k_tex.jpg")
        self.sky.setTexture(self.sky_tex, 1)
        self.sky.reparentTo(render)
        self.sky.setScale(40)

        # Load the Sun
        self.sun = loader.loadModel("models/planet_sphere")
        self.sun_tex = loader.loadTexture("models/sun_1k_tex.jpg")
        self.sun.setTexture(self.sun_tex, 1)
        self.sun.reparentTo(render)
        self.sun.setScale(2 * self.sizescale)

        # Load mercury
        self.mercury = loader.loadModel("models/planet_sphere")
        self.mercury_tex = loader.loadTexture("models/mercury_1k_tex.jpg")
        self.mercury.setTexture(self.mercury_tex, 1)
        self.mercury.reparentTo(self.orbit_root_mercury)
        self.mercury.setPos(0.38 * self.orbitscale, 0, 0)
        self.mercury.setScale(0.385 * self.sizescale)

        # Load Venus
        self.venus = loader.loadModel("models/planet_sphere")
        self.venus_tex = loader.loadTexture("models/venus_1k_tex.jpg")
        self.venus.setTexture(self.venus_tex, 1)
        self.venus.reparentTo(self.orbit_root_venus)
        self.venus.setPos(0.72 * self.orbitscale, 0, 0)
        self.venus.setScale(0.923 * self.sizescale)

        # Load Mars
        self.mars = loader.loadModel("models/planet_sphere")
        self.mars_tex = loader.loadTexture("models/mars_1k_tex.jpg")
        self.mars.setTexture(self.mars_tex, 1)
        self.mars.reparentTo(self.orbit_root_mars)
        self.mars.setPos(1.52 * self.orbitscale, 0, 0)
        self.mars.setScale(0.515 * self.sizescale)

        # Load Earth
        self.earth = loader.loadModel("models/planet_sphere")
        self.earth_tex = loader.loadTexture("models/earth_1k_tex.jpg")
        self.earth.setTexture(self.earth_tex, 1)
        self.earth.reparentTo(self.orbit_root_earth)
        self.earth.setScale(self.sizescale)
        self.earth.setPos(self.orbitscale, 0, 0)

        # Offest the moon dummy node so that it is positioned properly
        self.orbit_root_moon.setPos(self.orbitscale, 0, 0)

        # Load the moon
        self.moon = loader.loadModel("models/planet_sphere")
        self.moon_tex = loader.loadTexture("models/moon_1k_tex.jpg")
        self.moon.setTexture(self.moon_tex, 1)
        self.moon.reparentTo(self.orbit_root_moon)
        self.moon.setScale(0.1 * self.sizescale)
        self.moon.setPos(0.1 * self.orbitscale, 0, 0)
    # end loadPlanets()

    def rotatePlanets(self):
        # rotatePlanets creates intervals to actually use the hierarchy we created
        # to turn the sun, planets, and moon to give a rough representation of the
        # solar system. The next lesson will go into more depth on intervals.
        self.day_period_sun = self.sun.hprInterval(20, (360, 0, 0))

        self.orbit_period_mercury = self.orbit_root_mercury.hprInterval(
            (0.241 * self.yearscale), (360, 0, 0))
        self.day_period_mercury = self.mercury.hprInterval(
            (59 * self.dayscale), (360, 0, 0))

        self.orbit_period_venus = self.orbit_root_venus.hprInterval(
            (0.615 * self.yearscale), (360, 0, 0))
        self.day_period_venus = self.venus.hprInterval(
            (243 * self.dayscale), (360, 0, 0))

        self.orbit_period_earth = self.orbit_root_earth.hprInterval(
            self.yearscale, (360, 0, 0))
        self.day_period_earth = self.earth.hprInterval(
            self.dayscale, (360, 0, 0))

        self.orbit_period_moon = self.orbit_root_moon.hprInterval(
            (.0749 * self.yearscale), (360, 0, 0))
        self.day_period_moon = self.moon.hprInterval(
            (.0749 * self.yearscale), (360, 0, 0))

        self.orbit_period_mars = self.orbit_root_mars.hprInterval(
            (1.881 * self.yearscale), (360, 0, 0))
        self.day_period_mars = self.mars.hprInterval(
            (1.03 * self.dayscale), (360, 0, 0))

        self.day_period_sun.loop()
        self.orbit_period_mercury.loop()
        self.day_period_mercury.loop()
        self.orbit_period_venus.loop()
        self.day_period_venus.loop()
        self.orbit_period_earth.loop()
        self.day_period_earth.loop()
        self.orbit_period_moon.loop()
        self.day_period_moon.loop()
        self.orbit_period_mars.loop()
        self.day_period_mars.loop()
    # end RotatePlanets()
# end class world

w = World()
base.run()