Re: issues with rotations

Hi,

use origin instead of pos!
Hans

from visual import *
from time import sleep

#create a set of axes for a visual reference when rotating
xaxis=cylinder(pos=(0,0,0), axis=(5,0,0), color=(1,0,0), radius=0.2)
yaxis=cylinder(pos=(0,0,0), axis=(0,5,0), color=(0,1,0), radius=0.2)
zaxis=cylinder(pos=(0,0,0), axis=(0,0,5), color=(0,0,1), radius=0.2)

#create the ball to be rotated
ball = sphere(pos=(2,2,0), radius = 0.5)

#set rotation angle for 1/20 of a rotation
rotationAngle = 6.28/20.0

#have the ball rotate about the x-axis while
#maintaining 2 units from the xy-plane

#allows viewing and zooming before the start of the loop
s = input("type number to start:")

for i in range(20):
     ball.rotate(angle=rotationAngle, origin=(2,0,0), axis=(1,0,0))
     sleep(0.2)







Am 28.12.2012 14:55, schrieb Zittlow, Mike:
> I wrote a little program to get an understanding of the rotation of 
> objects and have not been able to get things to work as I would like. 
> I cannot get objects rotate about their centers. Believe is some code 
> where I am trying to get a sphere to rotate about the x-axis while 
> maintaining a 2 unit distance from the yz-plane.
>
>
> Any assistance would be greatly appreciated.
>
> from visual import *
> from time import sleep
>
> #create a set of axes for a visual reference when rotating
> xaxis=cylinder(pos=(0,0,0), axis=(5,0,0), color=(1,0,0), radius=0.2)
> yaxis=cylinder(pos=(0,0,0), axis=(0,5,0), color=(0,1,0), radius=0.2)
> zaxis=cylinder(pos=(0,0,0), axis=(0,0,5), color=(0,0,1), radius=0.2)
>
> #create the ball to be rotated
> ball = sphere(pos=(2,2,0), radius = 0.5)
>
> #set rotation angle for 1/20 of a rotation
> rotationAngle = 6.28/20.0
>
> #have the ball rotate about the x-axis while
> #maintaining 2 units from the xy-plane
>
> for i in range(20):
> ball.rotate(angle=rotationAngle, pos=(2,0,0), axis=(1,0,0))
>     sleep(0.2)
> thanks again,
>
> Mike
>
> -- 
> Michael Zittlow
> Mathematics Department Chairperson
> Southern Door High School
> Brussels, WI 54204
>
>
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