visualpython-users

[Visualpython-users] how to rotate a frame inside a class?

[Stefan P. <ste...@ur...>]

When rotating a frame inside a class, it starts to move and rotates around 
some mysterious center.
I could not find out how to calculate origin for a propper offset. 

Please find attached my example. I would be glad for any hint. 

Thanks in advance, 

Mit freundlichen Grüßen / With kindest regards 

Stefan Paulick 


http://www.urbeli.com
mailto://stefan.pa...@ur...
/*----------------------*/ 

import time
import visual 

b = visual.box(height = .1)
c = visual.cylinder(pos=(2,2,2),axis=(2,0,0),radius=.1)
f = visual.frame()
d = visual.cylinder(frame=f,pos=(1,2,1),axis=(2,0,0),radius=.1)
e = visual.cylinder(pos=(0,0,0),axis=(2,0,0),radius=.1)
e.pos = (3,2,3) 

class cC():
   def __init__(self, pos=(0,0,0), axis=(2,0,0)):
       self.pos = visual.vector(pos)
       self.axis = visual.vector(axis)
       self.f = visual.frame()
       self.g = 
visual.cylinder(frame=f,pos=self.pos,axis=self.axis,radius=.1)
       self.g.pos = visual.vector(0,2,0)

   def wpos(self,local):
       x_axis = visual.norm(f.axis)
       z_axis = visual.norm(visual.cross(f.axis, f.up))
       y_axis = visual.norm(visual.cross(z_axis, x_axis))
       #return  x_axis,y_axis,z_axis
       return self.f.pos+local[0]*x_axis+local[1]*y_axis+local[2]*z_axis

u = cC() 

ax = 0
cnt = 0. 

while 1:
   print u.wpos((1,2,0))

   if ax == 0:
       c.rotate(angle=.15, axis=(0,1,0), origin=(3,2,2))
       f.rotate(angle=.15, axis=(0,1,0), origin=(2,2,1))
       e.rotate(angle=.15, axis=(0,1,0), origin=(4,2,3))
       u.f.rotate(angle=.15, axis=(0,1,0), origin=(1,2,0)) 

       c.color = (1,1,0)
   elif ax == 1:
       c.rotate(angle=.15, axis=(0,0,1), origin=(3,2,2))
       f.rotate(angle=.15, axis=(0,0,1), origin=(2,2,1))
       e.rotate(angle=.15, axis=(0,0,1), origin=(4,2,3))
       u.f.rotate(angle=.15, axis=(0,0,1), origin=(1,2,0))
       c.color = (1,0,0)
   elif ax == 2:
       c.rotate(angle=.15, axis=(1,0,0), origin=(3,2,2))
       f.rotate(angle=.15, axis=(1,0,0), origin=(2,2,1))
       e.rotate(angle=.15, axis=(1,0,0), origin=(4,2,3))
       u.f.rotate(angle=.15, axis=(1,0,0), origin=(1,2,0))
       c.color = (0,0,1) 

   cnt +=1
   ## print cnt,ax
   if cnt > 10:
       cnt = 0
       ax += 1
       if ax > 2:
           ax = 0
   time.sleep(.1)

Re: [Visualpython-users] how to rotate a frame inside a class?

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

Sorry, but I don't understand what it is you're asking about. I don't=20
see any rotation being carried out. Please tell us in some detail what=20
it is you're trying to do, and what you think isn't working properly. It=20
would help a lot to simplify your example to its essence, just enough to=20
demonstrate the problem, without extraneous features.

Bruce Sherwood

Stefan Paulick wrote:
> When rotating a frame inside a class, it starts to move and rotates aro=
und=20
> some mysterious center.
> I could not find out how to calculate origin for a propper offset.=20
>
> Please find attached my example. I would be glad for any hint.=20
>
> Thanks in advance,=20
>
> Mit freundlichen Gr=FC=DFen / With kindest regards=20
>
> Stefan Paulick=20
>
>
> http://www.urbeli.com
> mailto://stefan.pa...@ur...
> /*----------------------*/=20
>
> import time
> import visual=20
>
> b =3D visual.box(height =3D .1)
> c =3D visual.cylinder(pos=3D(2,2,2),axis=3D(2,0,0),radius=3D.1)
> f =3D visual.frame()
> d =3D visual.cylinder(frame=3Df,pos=3D(1,2,1),axis=3D(2,0,0),radius=3D.=
1)
> e =3D visual.cylinder(pos=3D(0,0,0),axis=3D(2,0,0),radius=3D.1)
> e.pos =3D (3,2,3)=20
>
> class cC():
>    def __init__(self, pos=3D(0,0,0), axis=3D(2,0,0)):
>        self.pos =3D visual.vector(pos)
>        self.axis =3D visual.vector(axis)
>        self.f =3D visual.frame()
>        self.g =3D=20
> visual.cylinder(frame=3Df,pos=3Dself.pos,axis=3Dself.axis,radius=3D.1)
>        self.g.pos =3D visual.vector(0,2,0)
>
>    def wpos(self,local):
>        x_axis =3D visual.norm(f.axis)
>        z_axis =3D visual.norm(visual.cross(f.axis, f.up))
>        y_axis =3D visual.norm(visual.cross(z_axis, x_axis))
>        #return  x_axis,y_axis,z_axis
>        return self.f.pos+local[0]*x_axis+local[1]*y_axis+local[2]*z_axi=
s
>
> u =3D cC()=20
>
> ax =3D 0
> cnt =3D 0.=20
>
> while 1:
>    print u.wpos((1,2,0))
>
>    if ax =3D=3D 0:
>        c.rotate(angle=3D.15, axis=3D(0,1,0), origin=3D(3,2,2))
>        f.rotate(angle=3D.15, axis=3D(0,1,0), origin=3D(2,2,1))
>        e.rotate(angle=3D.15, axis=3D(0,1,0), origin=3D(4,2,3))
>        u.f.rotate(angle=3D.15, axis=3D(0,1,0), origin=3D(1,2,0))=20
>
>        c.color =3D (1,1,0)
>    elif ax =3D=3D 1:
>        c.rotate(angle=3D.15, axis=3D(0,0,1), origin=3D(3,2,2))
>        f.rotate(angle=3D.15, axis=3D(0,0,1), origin=3D(2,2,1))
>        e.rotate(angle=3D.15, axis=3D(0,0,1), origin=3D(4,2,3))
>        u.f.rotate(angle=3D.15, axis=3D(0,0,1), origin=3D(1,2,0))
>        c.color =3D (1,0,0)
>    elif ax =3D=3D 2:
>        c.rotate(angle=3D.15, axis=3D(1,0,0), origin=3D(3,2,2))
>        f.rotate(angle=3D.15, axis=3D(1,0,0), origin=3D(2,2,1))
>        e.rotate(angle=3D.15, axis=3D(1,0,0), origin=3D(4,2,3))
>        u.f.rotate(angle=3D.15, axis=3D(1,0,0), origin=3D(1,2,0))
>        c.color =3D (0,0,1)=20
>
>    cnt +=3D1
>    ## print cnt,ax
>    if cnt > 10:
>        cnt =3D 0
>        ax +=3D 1
>        if ax > 2:
>            ax =3D 0
>    time.sleep(.1)
>
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