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<DIV><FONT size=2 face=Arial>Hi Dave,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>This is the pipeline management problem I am trying
to solve</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2
face=Arial>
g1 -> g2 -> ...</FONT></DIV>
<DIV><FONT size=2 face=Arial>f1 -> [ f2 ] -> [ f3
] -></FONT><FONT size=2 face=Arial> h1 -> h2 ->
...</FONT></DIV>
<DIV><FONT size=2
face=Arial>
j1 -> j2 -> ...</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>where the filters in [] are optional. I want to be
able to add/remove f2 & f3 without having to find g1, h1 & j1 to reset
the input connection. I therefore create the output object for the chain f1
-> [ f2 ] -> [ f3 ] and use SetOutput() on the last filter.
This way, the input connection to filters g1, h1 & j1 only has to be set
once.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>This is a technique I used in VTK 4.2 with the
'old' pipeline architecture. Are there any other ways to achieve this
effect?</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Thanks for help.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>John.</FONT></DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=dave.demarle@kitware.com href="mailto:dave.demarle@kitware.com">David
E DeMarle</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=jcplatt@dsl.pipex.com
href="mailto:jcplatt@dsl.pipex.com">John Platt</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=vtkusers@vtk.org
href="mailto:vtkusers@vtk.org">vtkusers</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, September 16, 2009 6:34
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [vtkusers] Error using
SetOutput()</DIV>
<DIV><BR></DIV>Are you sure you want to SetOutput? For the most part (that is
everywhere other than within the filter which typically gets its own output
from the executive and populates it) , filter outputs shouldn't be messed with
for two reasons :<BR><BR>* the next time the filter updates the output will be
replaced<BR><BR>* more than one thing can be connected to a given filter's
output, so changing the output or its contents will cause inconsistency<BR><BR
clear=all>David E DeMarle<BR>Kitware, Inc.<BR>R&D Engineer<BR>28 Corporate
Drive<BR>Clifton Park, NY 12065-8662<BR>Phone: 518-371-3971 x109<BR><BR><BR>
<DIV class=gmail_quote>On Tue, Sep 15, 2009 at 6:23 PM, John Platt <SPAN
dir=ltr><<A
href="mailto:jcplatt@dsl.pipex.com">jcplatt@dsl.pipex.com</A>></SPAN>
wrote:<BR>
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style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0pt 0pt 0pt 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV bgcolor="#ffffff">
<DIV><FONT size=2 face=Arial>Hi,<BR>I am having trouble moving an output
between filters using SetOutput() as follows.</FONT></DIV>
<DIV><BR><FONT size=2 face=Arial>1. Single filter, f1.<BR>
vtkPolyData* myOutput = vtkPolyData::New();</FONT></DIV>
<DIV><FONT size=2 face=Arial>
<DIV><FONT size=2 face=Arial> f1->SetOutput( myOutput
);</FONT></DIV>
<DIV> </DIV> vtkAppendPolyData* myAppend =
vtkAppendPolyData::New();</FONT></DIV>
<DIV><FONT size=2 face=Arial> myAppend->AddInput(
myOutput );</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT><FONT size=2 face=Arial></FONT><FONT
size=2 face=Arial></FONT><BR><FONT size=2 face=Arial>"myOutput" is
displayed correctly.</FONT></DIV><FONT face=Arial></FONT>
<DIV><BR><FONT size=2 face=Arial>2. Append filter f2 to
f1.<BR> f1->SetOutput( 0 );<BR>
f2->SetInputConnection( f1->GetOutputPort() );<BR>
f2->SetOutput( myOutput );</FONT></DIV><FONT size=2 face=Arial>
<DIV><BR>"myOutput" does not appear to see the changes made by filter
f2.<BR></DIV>
<DIV>3. Remove filter f2.<BR>
f 2->Delete();<BR> f1->SetOutput( myOutput
);<BR></DIV>
<DIV>ERROR: In
/home/john/VTK/vtk-5.4.2/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx,
line 747<BR>vtkStreamingDemandDrivenPipeline : No maximum number of pieces
has been set in the information for output port 0 on algorithm
vtkf1"<BR></DIV>
<DIV>Any help on using SetOutput() would be greatly appreciated.</DIV>
<DIV> </DIV>
<DIV>Thanks.</DIV>
<DIV> </DIV><FONT color=#888888>
<DIV>John.</DIV></FONT></FONT></DIV><BR>_______________________________________________<BR>Powered
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