how does simple mesh movement with collisions work?

[securet]

problem is described from line 44

http://www.babylonjs-playground.com/#4HUQQ#175 

i try to move the white box and it should fall down to the ground, but it doesn't fall down and the movement seems to be strange too. Maybe I need to attach mass to it, but I don't know how.

The example is mainly taken from http://doc.babylonjs.com/tutorials/Cameras,_Mesh_Collisions_and_Gravity

[max123]

here you go: http://www.babylonjs-playground.com/#4HUQQ#176

[securet]

and how to apply gravity?

[max123]

a. use a full on physics engine
b. myMesh.moveWithCollisions(new BABYLON.Vector3(0, g, -.1));
g -= .02;