[Jerry]

Here's another way to do it.

from viz import *

go()

clearcolor(.8,.8,.8)
vert = add('ball.wrl')
vert.translate(0,1.8,2)

xang = 0
yang = 0
INCREMENT = .5

mouse(OFF)
restrictmouse(OFF)

def mousemove(x,y):					
	global xang,yang
	
	state = buttonstate()

	if state == MOUSEBUTTON_LEFT:
		xang = xang + x*INCREMENT
		yang = yang + y*INCREMENT
		vert.rotate(0,1,0,-x*INCREMENT,RELATIVE_WORLD)
		vert.rotate(1,0,0,y*INCREMENT,RELATIVE_WORLD)
		
mousedata(RELATIVE,RELATIVE)
callback(MOUSEMOVE_EVENT,mousemove)