The main reason for the playground is to produce an example for the guide on BJS that I am writing to show how translate, rotate, parent and setPivot can be used. After various struggles due to mistakes and lack of knowledge I have come up with this
http://www.babylonjs-playground.com/#102TBD#14 where you steer(?) the car (which has a set forward speed) with keys A and D
Issues are :
The response to the keys only happens if after clicking on run the canvas is clicked on immediately afterwards ( and sometimes you have to do this again before it works)
While a key is pressed down it interferes with the rendering (too much going on?)
If you think too much is going on then have a look back at earlier versions #10 for example.
It would be nice to have solutions to these problems but if not then as I can show the parts of the code I wanted to without the key control I will probably just go for a predetermined path for the car to follow.