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IDProjectCategoryView StatusDate SubmittedLast Update
0012751VTK(No Category)public2011-11-28 16:542015-12-01 10:21
ReporterPhilippe Pebay 
Assigned ToBerk Geveci 
PriorityurgentSeverityminorReproducibilityhave not tried
StatusclosedResolutionnot fixable 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0012751: vtkArcSource does not draw correctly arcs with angular sector of 180°
DescriptionThis script allows for the reproduction of the bug:

############################################################
from vtk import *
############################################################

# Create sources
arc = vtkArcSource()
arc.SetCenter( 0, 0, 0 )
arc.SetPoint1( 1, 0, 0 )
arc.SetPoint2( -1, 0, 0 )
arc.SetResolution( 32 )
sphere = vtkSphereSource()
sphere.SetRadius( 0.05 )
sphere.SetCenter( 0, 0, 0 )
sphere.SetPhiResolution( 16 )
sphere.SetThetaResolution( 16 )

# Create mappers
mapper1 = vtkPolyDataMapper()
mapper1.SetInput( arc.GetOutput() )

mapper2 = vtkPolyDataMapper()
mapper2.SetInputConnection( sphere.GetOutputPort() )

# Create actors
actor1 = vtkActor()
actor1.SetMapper( mapper1 )
actor1.GetProperty().SetColor( 1., 0., 0. )
actor2 = vtkActor()
actor2.SetMapper( mapper2 )

# Create renderer
renderer = vtkRenderer()
renderer.AddViewProp( actor1 )
renderer.AddViewProp( actor2 )
renderer.SetBackground( .3, .4 ,.5 )

# Create render window
window = vtkRenderWindow()
window.AddRenderer( renderer )
window.SetSize( 500, 500 )

# Create interactor
interactor = vtkRenderWindowInteractor()
interactor.SetRenderWindow( window )

# Start interaction
window.Render()
interactor.Start()
                                                                 
TagsNo tags attached.
ProjectKitware
Typeincorrect functionality
Attached Filespng file icon Incorrect180DegreesArc.png [^] (18,991 bytes) 2011-11-28 16:54

 Relationships

  Notes
(0031262)
Dave DeMarle (administrator)
2013-07-22 20:03

 moving all "tabled" bugs into "backlog" category since "tabled" is no longer used.
(0033482)
Cory Quammen (developer)
2014-10-02 12:48

 Verified this behavior.

I don't know what the solution should be. The problem is that the line segments from the center to both points are colinear, so an infinite number of planes contains the points. Which one do you pick to use for the plane of the arc? Which side of the colinear line segments in that plane do you want to place the arc?
(0035440)
Waldir Pimenta (reporter)
2015-11-10 05:20
edited on: 2015-11-10 05:33

 I think this bug should be closed as invalid, since the problem is not with the software (which does the only possible reasonable thing in this case), but with an ill-defined problem with infinite solutions.

In fact, I would suggest this interface to be deprecated, now that the alternative interface of UseNormalAndAngle is available, which is more intuitive and less susceptible to such unsolvable parametrizations. Or at least the UseNormalAndAngle interface should be made the default, rather than the opposite. What would be necessary to implement such a change? I'm willing to help in the transition if there's agreement that it's the right course of action.
(0035493)
Cory Quammen (developer)
2015-12-01 10:21

 I agree with closing the bug.

I don't think we should deprecate the methods in questions because they cab be convenient for some set of users. I also don't think we should change the default for UseNormalAndAngle because doing so could break existing code.

 Issue History
Date Modified Username Field Change
2011-11-28 16:54 Philippe Pebay New Issue
2011-11-28 16:54 Philippe Pebay Status backlog => tabled
2011-11-28 16:54 Philippe Pebay Assigned To => Berk Geveci
2011-11-28 16:54 Philippe Pebay File Added: Incorrect180DegreesArc.png
2013-07-22 20:03 Dave DeMarle Status tabled => backlog
2013-07-22 20:03 Dave DeMarle Note Added: 0031262
2014-10-02 12:48 Cory Quammen Note Added: 0033482
2015-11-10 05:20 Waldir Pimenta Note Added: 0035440
2015-11-10 05:33 Waldir Pimenta Note Edited: 0035440
2015-12-01 10:21 Cory Quammen Note Added: 0035493
2015-12-01 10:21 Cory Quammen Status backlog => closed
2015-12-01 10:21 Cory Quammen Resolution open => not fixable

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