[vtkusers] Again, I am doing something wrong. (Mace.cxx)

[Nick Edgington]

Just a quick comment:
     when I SetResolution(0) in the examples I posted  this is not
surprising, but I just thought I would note it.


 vtkConeSource *cone = vtkConeSource::New();
    cone->SetResolution(0);


void vtkGlyph3D::Execute()
{


........
numSourcePts = sourcePts->GetNumberOfPoints();  <<<==== Crashes
.......
}


----- Original Message -----
From: "Berk Geveci" <berkgeveci at hotmail.com>
To: <OutOfTurn at Yahoo.com>; <vtkusers at public.kitware.com>
Sent: Tuesday, January 22, 2002 10:06 AM
Subject: Re: [vtkusers] Again, I am doing something wrong. (Mace.cxx)


> Here is what happens: you get the input of the glyph
> filter and add a scalars array to it. This input is
> also the output of another source (in this case, a
> sphere source, as far as I can see). When the pipeline
> executes, sphere source initializes it's output before
> generating data and pufff your scalars are gone.
> Whatever you do, sphere source will initialize it's
> output everytime it runs. The simplest solution is this:
>
> Create a sphere source
> Update it
> Get it's output and severe it from the source
> (with SetOutput(NULL);)
> Add your scalars
>
> There other ways of doing this (some of which allow you
> to keep the source in the pipeline), if you want more hints,
> let me know.
>
> -Berk
>
>
> >From: "Nick Edgington" <OutOfTurn at Yahoo.com>
> >To: <vtkusers at public.kitware.com>
> >Subject: [vtkusers] Again, I am doing something wrong. (Mace.cxx)
> >Date: Tue, 22 Jan 2002 09:05:45 -0500
> >
> >     I am using Vtk40 under winnt.
> >
> >     I attach a scalar to a vtkGlyph3D
> >
> >
> >main(){
> >...........................
> >      scalars = vtkFloatArray::New();
> >
> >
> >       scalars->InsertTuple1(0, .5);
> >       scalars->InsertTuple1(1, .5);
> >       scalars->InsertTuple1(2, 1);
> >       scalars->InsertTuple1(3, 0);
> >       scalars->InsertTuple1(4, 1);
> >       scalars->InsertTuple1(5, 0);
> >
> >         ............
> >        vtkDataSet *input = glyph->GetInput();
> >       vtkPointData * pd = input->GetPointData();
> >       pd->SetScalars(scalars);
> >}
> >
> >When I trace through
> >
> >void vtkGlyph3D::Execute()
> >{
> >
> >         ...........
> >
> >         pd->GetScalars();      <<<<<===  returns NULL
> >                                           <<<<< === because
> >this->GetAttribute(SCALARS); returns -1
> >                                           <<<<<===  even thought it was
> >originally set to 0 by the pd->SetScalars(scalars);
> >
> >I can force it to work by changing the flag myself.
> >
> >                     Thanks in advance
> >                             Nick Edgington
> >
> >
> >
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