WorldViz User Forum - Stop moving after few seconds??

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- - Stop moving after few seconds?? (https://forum.worldviz.com/showthread.php?t=1999)

Chrissy2009

05-05-2009 04:37 AM

Stop moving after few seconds??

Hello all,

I'm trying to develop a application but now, I've got a problem:

I shoot a ball against other balls and then these balls collide. Like a billiard game. These balls are not on a table, they fly across the air. Therefore I set the gravity to [0,0,0].

This works very fine. But now the problem is that the balls are flying too long. It takes about 10 seconds till the balls stop moving. But I don't want to wait such a long time. The balls should stop moving after 3 seconds. Is this possible?

I searched the whole Vizard Documentation, but I can't find the relevant command.

I would be very pleased about every information and help.

Thanks a lot!
Chrissy

PS: Sorry for english mistakes

Moh200jo

05-05-2009 11:24 AM

the sound like you have to use timer. Could you please looking at vizard functions because vizard has a timer function.
hope this helped you!

Chrissy2009

05-06-2009 02:09 PM

But I only initiate the shoot. Afterwards the balls move automatically.

Where do I have to set the timer?

My code to initiate the shoot is:

Code:

vec.setLength(vizmat.Interpolate(1,400,power.get()))        

info.object.applyForce( vec, 1 )

One ball pushes the other balls away. And the time, until all balls will slow down, I want to constrict to max. 5 seconds.

Moh200jo

05-06-2009 03:52 PM

to shoot balls each time, try to define a shooting function, may be something like this

HTML Code:

def shoot():

    pass

   .

   .

vizact.ontimer(5,shoot)#each 5 sec

this script could have what you are looking for
let me know if this helped you.

Chrissy2009

05-06-2009 11:34 PM

Hi,

no - I don't think that's my problem.

Look. I've got one white ball and 14 other balls. Then I shoot the white ball against the other balls.

Code:

vec.setLength(vizmat.Interpolate(1,400,power.get()))        

info.object.applyForce( vec, 1 )

The white ball collides with the other balls and afterthat the other balls will fly across my room. I only initiate the shoot once!!

And now it takes about 20 seconds, until all balls will stop moving. And thats my problem.

Is there a command, like "stop moving all objects" or something like that?

Jeff	05-07-2009 11:12 AM

You could loop through all your objects and set their velocities and angular velocities to zero.

Code:

for i in range (len(objects)):

        objects[i].setVelocity([0,0,0])

        objects[i].setAngularVelocity([0,0,0])

Start a timer when when the force is applied that will expire after 3 seconds then call your function that stops the movement.

Chrissy2009

05-08-2009 03:11 AM

Hi Jeff,

thanks for your answer. This is exactly my problem. Great!

Is it possible to slow down the balls, so that they don't stop fitfully?

Thanks a lot.

Chrissy2009

05-10-2009 01:16 PM

Is there no idea to slow down the balls steadily?

Jeff	05-10-2009 02:47 PM

You could apply a small force opposite the direction the ball is moving. Here a function is called ten times, the first nine times getting the velocity of the ball and applying a small force opposite to it. On the tenth time the ball is stopped completely.

Code:

import viz

viz.go()

viz.phys.enable()



ground = viz.add('tut_ground.wrl')

ground.collidePlane()



ball = viz.add('ball.wrl', pos = [0,1,8])

ball.collideSphere()



ball.applyForce([2,0,10], .1)



num = 1

def slowBall():

        

        global num

        

        #slow down the ball

        if num <10:

                vx,vy,vz = ball.getVelocity()

                ball.applyForce([-vx,-vy,-vz], .01)

                num+=1

                

        #stop the ball        

        else:         

                ball.setVelocity([0,0,0])

                ball.setAngularVelocity([0,0,0])



#call function 10 times

vizact.ontimer2(.3,9, slowBall)

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