Quaternions

[roman_suvorov]

Damn, forgot about that acos. Then to get no rotation I need to use w=-1: 2*acos(-1) = 360 degrees. Thanks again farshizzo!

EDIT: The following code makes MainView look down X.

import viz
viz.go(viz.FULLSCREEN)

ROTATION_INC = 2
TRANSLATE_INC = 0.1

i = 0
while (i < 10):
	redBall = viz.add("white_ball.wrl")
	redBall.setPosition([i, 0, 0])
	redBall.color([1 - 0.1*i, 0, 0])
	
	greenBall = viz.add("white_ball.wrl")
	greenBall.setPosition([0, i, 0])
	greenBall.color([0, 1 - 0.1*i, 0])
	
	blueBall = viz.add("white_ball.wrl")
	blueBall.setPosition([0, 0, i])
	blueBall.color([0, 0, 1 - 0.1*i])
	
	i += 0.1
	
viz.MainView.setQuat([0,1,0,-1])
viz.MainView.setPosition(5, 0, 0.5)
	
vizact.whilekeydown(viz.KEY_UP, viz.move, 0, 0, TRANSLATE_INC)
vizact.whilekeydown(viz.KEY_DOWN, viz.move, 0, 0, -TRANSLATE_INC)
vizact.whilekeydown(viz.KEY_LEFT, viz.rotate, viz.BODY_ORI, -ROTATION_INC, 0, 0)
vizact.whilekeydown(viz.KEY_RIGHT, viz.rotate, viz.BODY_ORI, ROTATION_INC, 0, 0)
vizact.whilekeydown(viz.KEY_PAGE_UP, viz.rotate, viz.HEAD_ORI, 0, -ROTATION_INC, 0)
vizact.whilekeydown(viz.KEY_PAGE_DOWN, viz.rotate, viz.HEAD_ORI, 0, ROTATION_INC, 0)

and also produces much prettier axes. Hold on though, why [0,1,0]? We're speciifying no rotation around Y, not X as it seems?