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Re: [Visualpython-users] Recomputing Faces geometry
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From: Jamie R. <jam...@gm...> - 2009-07-29 18:31:34
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Bruce, Wow, thanks, that clears up a lot. I've been confused (obviously) about the invisible / delete relationship for a while. Cheers - jamie On Wed, Jul 29, 2009 at 11:15 AM, Bruce Sherwood<Bru...@nc...> wrote: > You merely need to make the object invisible before deleting it: > > def clearSurface(self): > self.surface.visible = False > del self.surface > ..... > > The issue is this: The human viewer counts as a reference for a VPython > object. For example, if you create ball = sphere() and then later say > ball = 3, there is no longer any way to reference the sphere and in a > non-VPython program Python would be free to delete the sphere. But > because the sphere is still visible on the screen, the reference count > does not go to zero and the human viewer can still view the sphere. > Hence the documented rule that you need to make an object invisible to > get rid of it (though the documentation could be a bit clearer on this). > > Bruce Sherwood > > Jamie Riotto wrote: >> 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 >>>> >>>> ------------------------------------------------------------------------------ >>>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day >>>> trial. Simplify your report design, integration and deployment - and focus on >>>> what you do best, core application coding. Discover what's new with >>>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>>> _______________________________________________ >>>> Visualpython-users mailing list >>>> Vis...@li... >>>> https://lists.sourceforge.net/lists/listinfo/visualpython-users >>> ------------------------------------------------------------------------------ >>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day >>> trial. Simplify your report design, integration and deployment - and focus on >>> what you do best, core application coding. Discover what's new with >>> Crystal Reports now. http://p.sf.net/sfu/bobj-july >>> _______________________________________________ >>> Visualpython-users mailing list >>> Vis...@li... >>> https://lists.sourceforge.net/lists/listinfo/visualpython-users >>> >> >> ------------------------------------------------------------------------------ >> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day >> trial. Simplify your report design, integration and deployment - and focus on >> what you do best, core application coding. Discover what's new with >> Crystal Reports now. http://p.sf.net/sfu/bobj-july >> _______________________________________________ >> Visualpython-users mailing list >> Vis...@li... >> https://lists.sourceforge.net/lists/listinfo/visualpython-users > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > _______________________________________________ > Visualpython-users mailing list > Vis...@li... > https://lists.sourceforge.net/lists/listinfo/visualpython-users > |
