[Visualpython-users] help with moving camera

[Astan C. <st...@al...>]

Hi,
I have a simple VPython simulation that attempts to move the camera 
based on keyboard input.
For some reason the amount of movement is not consistent in any 
particular direction regardless of value. Can anyone tell me why? Is 
there something wrong with my code?
Thanks for the help.
Here is my code.

from __future__ import division
from visual import *
import random

if __name__ == '__main__':

    # Set up window and sceen.
    scene = display()
    scene.fullscreen = 0
    scene.autocenter = 0
    scene.autoscale = 0
    scene.userzoom = 0
    scene.userspin = 0
    scene.ambient = 0
    outer = 10
    outer*= 2
    scene.range = (outer,outer,outer)

    rate(50)

    sunpos = [0,0,0]
    color = [ 3, 1.5, .75]
    sunradius = 2
    sun = sphere( pos=sunpos, radius=sunradius, color=color)

    while True:
        if scene.kb.keys:
            s = scene.kb.getkey()
            #move in
            if s == 'up':
                newforward = vector(0,0,1.25)               
                scene.center = 
scene.mouse.camera-newforward*mag(scene.center-scene.mouse.camera)
            #move out
            if s == 'down':
                newbackward = vector(0,0,-1.25)               
                scene.center = 
scene.mouse.camera-newbackward*mag(scene.center-scene.mouse.camera)
            #move left
            if s == 'left':
                newbackward = vector(-1.25,0,0)               
                scene.center = 
scene.mouse.camera-newbackward*mag(scene.center-scene.mouse.camera)
            #move right
            if s == 'right':
                newbackward = vector(1.25,0,0)               
                scene.center = 
scene.mouse.camera-newbackward*mag(scene.center-scene.mouse.camera)
                            



-- 
"Formulations of number theory: Complete, Consistent, Non-trivial. Choose two."


Animal Logic
http://www.animallogic.com

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