Mouse drag event

```
What steps will reproduce the problem?
1. When dragging mouse to rotate, obj stop suddenly. Is there a velocity factor
that will give the obj some time to slow down? eg.
this.rotMatrix.rotateAboutYAxis(rotY * this.velocity.Y); for each time frame
this.velocity --;
2.
3.

What is the expected output? What do you see instead?
It will be nice if we can see the obj slow down slowly rather than suddenly

What version of the product are you using? On what operating system?

Please provide any additional information below.

```

Original issue reported on code.google.com by `junhong....@solstice.sg` on 10 Aug 2014 at 10:16