Hello,   I'm about to complete the port of my prototype from threejs to bjs. I read the wiki about position and rotation but there is still a piece of information I need :   What do the dimension values represent ?   I thought they were pixels :  a box sized 10x10x10 would have been 10 pixels each size if the cam were set at the same position.   But viewing tuto video chapter4 about materials, I saw DK set a sphere (diameter = 2) at position.y = 1 and this sphere looked quite "big" (meaning it w