GRAVITAS

A simple physics module for python

The current goal of the project is to have basic physics simulations available at your fingertips. Physics caluclations with the help of one function.

Usage

• Run Simulation for Particle System:

  • within engine2.py:

    • as of the time being, variables cant be changed at runtime.
    • Number of Particles in System : NUM_PARTICLES = <integral value>
    • Num of Rigid Bodies in System : NUM_RIGID_BODIES = <integral value>
    • to change the default and random initialized values for the respective systems

      NUM_PARTICLES = 1 # any integral_value
      
      particles = [] # stores list of particle objects
      
      # line 38 - Particle Simulation
      def InitializeParticles():
         for _ in range(NUM_PARTICLES):
            particle = Particle(
               position=vector2(x=rd.randint(0, 50), y=rd,randint(0, 50)).vec(), # range for random positioning (<start>, <stop>)
               velocity=vector2(x=0, y=0).vec(), # provide initialized velocities
               mass=1 # mass of particle
            )
      particles.append(particle)

      NUM_RIGID_BODIES = 1 # any integral_value
      
      rigidBodies = [] # stores list of particle objects
      # line 124 - Rigid Body Simulation
      def InitializeRigidBodies():
         for _ in range(NUM_RIGID_BODIES):
            rigidBody = RigidBody(
               position=vector2(x=rd.randint(0, 50), y=rd.randint(0, 50)), # range for random positioning (<start>, <stop>)
               linearVelocity=vector2(x=0, y=0), # provide initialized linear velocities
               angle=(rd.randint(0, 360))/360 * np.pi, # initialized angle in radians
               angularVelocity=0, # initial angular velocity
               force=vector2(x=0, y=0), 
               torque=0,
               shape=[1 + rd.randint(0, 2), 1 + rd.randint(0, 2), 1]
               # shape is defined in following manner:
               # [<width of the BoxShape>, <length of BoxShape>, <mass of BoxShape>]
            )
            # force and torque are set to 0 here (which means its intial value is null / undefined)
            # it is later on computed on calling ComputeForceAndTorque(<rigidbody>) function
      
      rigidBodies.append(rigidBody)

  • Within main.py

    • Simulation for rigid

      # main.py
       import engine2 as e2d
      
      # Run simulation for Particle System
      e2d.RunSimulation()

      

    • Simulation for rigid body

      import engine2 as e2d
      
      # Run simulation for Rigid Body System
      e2d.RunRigidBodySimulation()

      

Features

v 0.0.2 :

1. Rigid Body simulations (2D) [basic simulation under gravity infulence]

v 0.0.1 :

1. Partilce Simulation (2D) [basic simulation under gravity under gravity influence]

Roadmap

v 0.0.3 + :

1. Collision detection for Solid Objects
2. Constrained Rigid Body Simulation

Instructions

1. Install

   ! pip package unavailable for the time being.

Credit

Introduction to Physics Simulations : https://www.toptal.com/game/video-game-physics-part-i-an-introduction-to-rigid-body-dynamics