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//get/set active camera
myCamera = scene.cameras.getByIndex(0);
myCamera.roll = 0.0;
myMoveDistance = 1;

//inform the user
console.println("Use the following keys to navigate in the scene:");
console.println("* Arrow Keys = Left/Right/Forward/Back");
console.println("* u or d = Up/Down");
console.println("* Home or End = Camera Roll(reversed on Mac/Win)");

//Create the handler, and set to drive camera
myKeyHandler = new KeyEventHandler();
myKeyHandler.onEvent = function(event)
{
switch(event.characterCode)
{
case 28: //Left arrow
myCamera.targetPosition.x = myCamera.targetPosition.x - myMoveDistance;
myCamera.position.x = myCamera.position.x - myMoveDistance;
myCamera.roll = 0.0;
break;

case 29: //Right arrow
myCamera.targetPosition.x = myCamera.targetPosition.x + myMoveDistance;
myCamera.position.x = myCamera.position.x + myMoveDistance;
myCamera.roll = 0.0;
break;

case 30: //Up arrow
myCamera.targetPosition.y = myCamera.targetPosition.y + myMoveDistance;
myCamera.position.y = myCamera.position.y + myMoveDistance;
myCamera.roll = 0.0;
break;

case 31: //Down arrow
myCamera.targetPosition.y = myCamera.targetPosition.y - myMoveDistance;
myCamera.position.y = myCamera.position.y - myMoveDistance;
myCamera.roll = 0.0;
break;

case 117: //U for up
myCamera.targetPosition.z = myCamera.targetPosition.z + myMoveDistance;
myCamera.position.z = myCamera.position.z + myMoveDistance;
myCamera.roll = 0.0;
break;

case 100: //Do for Down
myCamera.targetPosition.z = myCamera.targetPosition.z - myMoveDistance;
myCamera.position.z = myCamera.position.z - myMoveDistance;
myCamera.roll = 0.0;
break;

case 1: //Home or End (Reversed on Mac/Win)
myCamera.roll = myCamera.roll + 0.1;
break;

case 4: //Home or End (Reversed on Mac/Win)
myCamera.roll = myCamera.roll - 0.1;
break;
}
}
//register and process
runtime.addEventHandler(myKeyHandler);