Control-click and drag to zoom in/out.  
  Right-click and drag to translate the camera.  
     
  Click on a particle to select it, drag to move it around.  
     
  P: Add a particle of charge +2.  
  N: Add a particle of charge -2.  
  +: Increase the charge on the selected particle.  
  -: Decrease the charge on the selected particle.  
  X: Delete the selected particle.  
     
  F: Toggle fieldlines on selected particle.  
     
  ]: Pause the the simulation.  
  I: Show/Hide instructions.  
     
  Enter desired values in the fields for dimension, position, and velocity for each lattice. Press "Start" to start the simulation. Press "Clear" to reset the simulation.