Physics demo

Click and drag Blue shapes with

left click to move them

Click and drag with a right click

to move the camera

R to reposition the camera to original 

position and respawn blue shapes

f to just respawn blue shapes

Middle click to reset the camera to original state

Scroll down to zoom out

Scroll up to zoom in

B Toggle modes (build, playground)

(in build mode)

E to create a new cube 

D to create a new circle 

Q to delete the object your mouse is on top of