Include this script into your page along with the iframe for a responsive media embed
A quick video to show how to make boxes interactive and pushable. Convex physics was used because the pivots of the boxes was in the bottom not the center which would make a box offset incorrect. Then a collision flag of 0|1 was used to set make the boxes pushable. The engine is still in dev which is why there are a few workflow problems. Also, the terrain physics material is a little bit sliding which will be fixed.