visualpython-users

[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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Re: [Visualpython-users] help with moving camera

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

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
           
           
                                         


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


Animal Logic
http://www.animallogic.com

Please think of the environment before printing this email.

This email and any attachments may be confidential and/or privileged. If you are not the intended recipient of this email, you must not disclose or use the information contained in it. Please notify the sender immediately and delete this document if you have received it in error. We do not guarantee this email is error or virus free.

Re: [Visualpython-users] help with moving camera

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

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
>            
>            
>                                          
> 
> 

Re: [Visualpython-users] help with moving camera

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

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
>>                                                               
>>
>
>

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


Animal Logic
http://www.animallogic.com

Please think of the environment before printing this email.

This email and any attachments may be confidential and/or privileged. If you are not the intended recipient of this email, you must not disclose or use the information contained in it. Please notify the sender immediately and delete this document if you have received it in error. We do not guarantee this email is error or virus free.

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

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

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
>>>                                                               
>>>
>>>       
>>     
>
>   

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



Animal Logic
http://www.animallogic.com

Please think of the environment before printing this email.

This email and any attachments may be confidential and/or privileged. If you are not the intended recipient of this email, you must not disclose or use the information contained in it. Please notify the sender immediately and delete this document if you have received it in error. We do not guarantee this email is error or virus free.

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
>>>>                                                               
>>>>
>>>>       
>>>     
>>
>>   
> 
> -- 
> "Formulations of number theory: Complete, Consistent, Non-trivial. Choose two."
> 
> 
> <http://www.animallogic.com>
> 
> Please think of the environment before printing this email.
> 
> This email and any attachments may be confidential and/or privileged. If 
> you are not the intended recipient of this email, you must not disclose 
> or use the information
> contained in it. Please notify the sender immediately and delete this 
> document if you have received it in error. We do not guarantee this 
> email is error or virus free.
> 
> 
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