Re: [Visualpython-users] help with moving camera (fixed)

[Bruce S. <Bru...@nc...>]

1) I don't see how to put VPython inside something else.

2) See the example program stonehenge.py.

Bruce Sherwood

Astan Chee wrote:
> Hi,
> Sorry, my mistake. It does work properly. The z-position of the camera 
> doesnt change and the camera strafes to the left or right properly, but 
> it does this disregarding where the camera is facing. Also, I have 
> several other questions about VPython:
> 1. Is it possible to put the VPython frame in a wxFrame from wxPython?
> 2. Has anyone tried to place a camera or affix in on a moving object, so 
> that the camera moves according to the object it is placed on?
> Thanks again for the help.
> Cheers
> Astan
> 
> Astan Chee wrote:
>> Hi,
>> Sorry, I turned off scene.userspin and what I mean about the problem is 
>> that if I move the camera to the right abit, turn it to 20 degrees to 
>> the left and then move it to the right abit more, the second time it 
>> moves to the right, it seems to also move further away from the sphere. 
>> Why does this happen?
>> Thanks again for your help.
>> Cheers
>> Astan
>>
>> Bruce Sherwood wrote:
>>   
>>> I don't understand your question. All of the keys seem to do what you 
>>> say they should do. There's no way to rotate the camera (at least in 
>>> the usual VPython sense) because you've set scene.userspin = 0.
>>>
>>> As for scene.forward, it is a vector pointing from the camera position 
>>> toward scene.center. The magnitude of the vector scene.forward is 
>>> irrelevant; it's just a direction.
>>>
>>> Bruce Sherwood
>>>
>>> Astan Chee wrote:
>>>     
>>>> Hi,
>>>> So now I've had abit of success. I can move the camera around using 
>>>> keyboard shortcuts but whenever the camera is rotated, the move 
>>>> up/down and strafe left/right becomes inconsistent. How do I update 
>>>> these? Im thinking I have to change the scene.forward somewhere, but 
>>>> to what value?
>>>> Thanks again for any advice.
>>>> Astan
>>>> Below 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()
>>>>             angle = 0
>>>>             #move in / out
>>>>             if s == 'w' or s == 's':
>>>>                 ray = 1
>>>>                 if s == 's':
>>>>                     ray = -1
>>>>                 scene.center = scene.center+scene.forward*ray/2.
>>>>             #strafe left / right
>>>>             if s == 'a' or s == 'd':
>>>>                 move = vector(-0.5,0,0)
>>>>                 if s == 'd':
>>>>                     move = vector(0.5,0,0)
>>>>                 scene.center = scene.center+move
>>>>             #look left / right
>>>>             if s == 'left' or s == 'right':
>>>>                 ray = 0
>>>>                 angle = 0.6
>>>>                 if s == 'right':
>>>>                     angle = -0.6
>>>>                 newforward = rotate(scene.forward, axis=scene.up, 
>>>> angle=angle/10.)
>>>>                 scene.center = 
>>>> scene.mouse.camera+newforward*mag(scene.center-scene.mouse.camera)
>>>>                 scene.forward = newforward
>>>>                 scene.center = scene.center+scene.forward*ray/2.
>>>>             #move up / down
>>>>             if s == 'f' or s == 'v':
>>>>                 move = vector(0,-0.5,0)
>>>>                 if s == 'v':
>>>>                     move = vector(0,0.5,0)
>>>>                 scene.center = scene.center+move
>>>>                                                               
>>>>
>>>>       
>>>     
>>
>>   
> 
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