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-   -   Help with applying force (https://forum.worldviz.com/showthread.php?t=5376)

Madzar 06-11-2015 06:26 AM

Help with applying force
 
Hi. I am new to programing in vizard, or programing as a whole. I have an asignment to add support to a ball, and to apply force on the ball, to make her move from from her support. Original program is:

Code:

"""
Student: Ognjan Luzanin
Simulacija klackalice.
Pritisni razmaknicu za resetovanje scene.
"""
import viz
import vizact

viz.setMultiSample(4)
viz.fov(60)
viz.go()

viz.phys.setGravity(0,-9.81,0)

import vizinfo
vizinfo.InfoPanel(align=viz.ALIGN_RIGHT_BOTTOM)

#Bojimo pozadinu u svetlo plavu boju
viz.clearcolor( 0,.5,1 )

#Onesposobljavamo delovanje sila
viz.phys.enable()

#Dodajemo podlogu
podloga = viz.addChild('tut_ground.wrl')
podloga.collidePlane() #Kontrola kolizije (omogucava da se telo ponasa kao cvrsto telo)

#Dodajemo dasku za klackalicu
daska = viz.addChild('box.wrl')
daska.setScale([10,0.3,1])
daska.collideBox() #Kontrola kolizije (omogucava da se telo ponasa kao cvrsto telo)

#Dodajemo oslonac za klackalicu
oslonac = viz.addChild('tut_cone.wrl')
oslonac.setScale([0.5,0.5,0.5])
oslonac.setPosition([0,0.01,1])
oslonac.collideMesh() #Kontrola kolizije (omogucava da se telo ponasa kao cvrsto telo)
oslonac.disable( viz.DYNAMICS ) #Iskljucujemo dinamicke sile za oslonac (nece reagovati na dejstvo sila prilikom udara tega i kontratega)

#Dodajemo teg
teg = viz.addChild('white_ball.wrl')
teg.setScale(3,3,3)
teg.collideBox(density=10)
teg.disable(viz.DYNAMICS)

#Dodajemo kontrateg
kontrateg = viz.addChild('box.wrl')
kontrateg.color(viz.YELLOW)
kontrateg.collideBox(density=5) #The high density parameter makes the object heavier

#Podesavamo pogled na scenu, tako da sve bude obuhvaceno vidnim poljem
viz.MainView.setPosition([0,2,-10])

#Sve elemente scene postavljamo u pocetni polozaj
def reset():
        daska.reset() #Ponistava prethodno dejstvo svih sila
        daska.setPosition([0,3,5])
        daska.setEuler([0,0,0])

        teg.reset()
        teg.setPosition([4,5,5])
        teg.setEuler([0,0,0])
        teg.disable(viz.DYNAMICS)

        kontrateg.reset()
        kontrateg.setPosition([-4, 9, 5])
        kontrateg.setEuler([90,0,0])
        kontrateg.disable(viz.DYNAMICS)

def start():
        teg.enable(viz.DYNAMICS)
        kontrateg.enable(viz.DYNAMICS)

#Resetujemo simulaciju i spremni smo za pocetak rada
reset()

#Osposobljavamo simulaciju da reaguje na oznacene tastere
vizact.onkeydown(' ', reset)
vizact.onkeydown('s', start)

I put the support like this:

Code:

#Dodajemo oslonac za teg
oslonac1 = viz.addChild('box.wrl')
oslonac1.setEuler([90,180,0])
oslonac1.setScale(4,0.5,4)
oslonac1.collideBox(density=5)
oslonac1.setPosition([5.8,4.45,5])
oslonac1.disable(viz.DYNAMICS)
nogica1 = viz.addChild('pole.wrl',parent=oslonac1)
nogica1.setPosition([0.5,0.5,0])
nogica1.collideBox(density=10)
nogica1.disable(viz.DYNAMICS)
nogica2 = viz.addChild('pole.wrl',parent=oslonac1)
nogica2.setPosition([-0.5,0.5,0,])
nogica2.collideBox(density=10)
nogica2.disable(viz.DYNAMICS)

When i try to scale nogica1 or nogica2 it just goes crazy. Since i dont know how scaling works. I tried looking in help section, but its like alien to me. :(

When i tried aplying the force with
Code:

teg.applyForce(dir=[-10*tegForce.get(),0,0],duration=0.1)
it does nothing. If someone could help me with this, i would be soooooo grateful. :D

Jeff 06-15-2015 04:36 PM

Please post the simplest Vizard code that reproduces the issue.


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