[Visualpython-users] povexport

[Arne K. <arn...@pp...>]

I just install Vpython (I compile it from the cvs) on Linux 2.2.18 (suse
7.1 distribution) under python2.0. 
It seems that Vpython work fine.
But I have a problem with povexport.py (from povexport1-1.zip).

It seems that the problem comes from the call to hasattr() in the
add_texture() function in povexport.py.

for testing purpose, I have modified the add_texture function in
povexport.py as:

-------------------------------------------------------
def add_texture(a, code):
    # add in user-specified texture (will override color)
    print 'in add_texture',a,a.__class__,a.__members__ #added by A.K
    if hasattr(a, 'pov_texture'):
	print 'yes, has attr pov_texture' #added by A.K.
        tstring = '    texture { '+ a.pov_texture + ' }\n'
        end = rfind(code, '}')
        code = code[:end] + tstring + code[end:]
    else:#else block added by A.K.					
	print 'no, has not attr pov_texture'	
	return code				
-------------------------------------------------

and I excute the following python povsimple.py module:

---------------------------------------------------
#file povsimple.py

from visual import  *

import povexport #with the modified add_texture
print 'Instructions: zoom and rotate to get the viewing angle\n\
you want.  Click the mouse to generate POV-Ray code.\n'
scene.x=scene.y=0

rod = cylinder(pos=(0,2,1), axis=(5,0,0), radius=1)
rod.color = (0,0,1) # make rod be blue

filename = 'povexample.pov'


scene.mouse.getclick()  ## position camera somewhere, then click

code = povexport.export(display=scene)


ff = open(filename, 'w')
ff.write(code)
ff.close()
print 'PovRay code written to ',filename
-----------------------------------------------------------

then the execution of:

python povsimple.py

gives:
 
-------------------------------------------------
Visual-2001-02-20
Instructions: zoom and rotate to get the viewing angle
you want.  Click the mouse to generate POV-Ray code.
 
in add_texture <Primitive object at 0x818f5c8> cylinder ['axis', 'blue',
'color', 'display', 'frame', 'green', 'length', 'pos', 'radius', 'red',
'up', 'visible', 'x', 'y', 'z']
Erreur de segmentation   
------------------------------------------------

thanks for your help

-- 
Arne Keller
Laboratoire de Photophysique Moleculaire du CNRS, Bat. 213.
Universite de Paris-Sud, 91405 Orsay Cedex, France.
tel.: (33) 1 69 15 82 83 -- fax. : (33) 1 69 15 67 77