Re: [Visualpython-users] Recomputing Faces geometry

[Jamie R. <jam...@gm...>]

Sure, here is a scaled down version of the surface demo. I expect
to see only one triangle after the "clearSurface" but I still see two.

Thanks - jamie



from __future__ import division
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from visual import *

newframe = frame

class Object(object):

    def __init__(self, parent=None, frame=None, pos=(0,0,0), axis=(1,0,0),
                                color=color.green):
        self.frame = newframe(frame=frame, pos=pos, axis=axis)
        self.surface = faces(frame=self.frame)
        self.color = color
        self.vertexList = []
        self.normalList = []
        self.colorList = []

    def clearSurface(self):
        del self.surface
        self.surface = faces(frame=self.frame)
        self.vertexList = []
        self.normalList = []

    def addTri(self, p1, p2, p3):
        """Add a triangle to the model"""
        v1 = vector(p1)
        v2 = vector(p2)
        v3 = vector(p3)

        try:
            normal = norm( cross(v2-v1, v3-v1) )
        except:
            normal = vector(0,0,0)

        self.vertexList = self.vertexList + [v1,v2,v3]
        self.normalList = self.normalList + [normal,normal,normal]
        self.colorList =  self.colorList + [self.color,self.color,self.color]


    def computeSurface(self):
        """ Create faces out of vertex, normal and color info"""
        self.surface = faces(frame=self.frame, pos=self.vertexList,
                                      normal=self.normalList,
                                      color=self.colorList)



if __name__ == '__main__':
    # origin sphere for reference
    sphere(radius=0.1)

    p1 = (-2, -1, 0)
    p2 = (-1, 1, 0)
    p3 = (-2,  1, 0)


    p4 = (3, -1, 0)
    p5 = (5, -1, 0)
    p6 = (4, 2, 0)

    x=Object()
    x.addTri(p1,  p2,  p3)
    x.computeSurface()

    print "new surface"
    x.clearSurface()
    x.addTri(p4, p5, p6)
    x.computeSurface()
    print x.vertexList


On Wed, Jul 29, 2009 at 8:52 AM, Bruce Sherwood<Bru...@nc...> wrote:
> Could you please post a short test routine that illustrates the problem?
> Thanks.
>
> Bruce Sherwood
>
> Jamie Riotto wrote:
>> I have a VPython faces based object. I would like the user to be able to change
>> fundamental parameters that affect its shape (like setting numSides on
>> a Polygon),
>> but I can't seem to get VPython to re-render the new shape. I've tried
>> to "Del" the
>> existing face list, then create a new one, but the old object is still
>> shown. Any suggestions?
>>
>> Thank - Jamie Riotto
>>
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