Moving an object is not smooth.. why?

Dividing by 100 would probably help. But the underlying problem is still that the angle values are far too big.

That's why it ends up moving in steps. A very big floating point number can't change by a small amount. In this example the smallest possible change is 8:

Graphics3D 640, 480, 0, 1

BIG# = 123123000

For n# = 1 To 30
	Print Int( BIG + n )
Next

WaitKey