title: Do 3D models have size information?
body: <p>I know 3d model (.fbx, .obj etc) files have accurate scale information. But do they also have embedded unit measurement information (inches, centimeters)?
  Is it possible to include units information where I draw a cube of 1*1*1 cm and then later generate another cube of 1*1*1 m. If so how interoperable are they?
  Can I generate these 2 different size cubes in one software(say unity or 3ds max), export fbx file and then import it in another software like playcanvas. Will they recognize the different sizes ?</p>