[GRASS-user] r.out.vtk RGB / input issue

["Sören Gebbert"]

Hi Peter,
you have to disable the "Map Scalars" check button in the display tab to
avoid the use of a lookup table.

Best regards
Soeren

-------- Original-Nachricht --------
> Datum: Thu, 18 Jun 2009 16:16:08 +0200
> Von: "Peter Löwe" <peter.loewe at gmx.de>
> An: "Sören Gebbert" <soerengebbert at gmx.de>, grass-user at lists.osgeo.org
> Betreff: Re: [GRASS-user] r.out.vtk RGB / input issue

> Hi Sören,
> 
> thanks for your fast help - the patch works.
> 
> However, only limited success on the paraview-side (Paraview 3.4.0)
> 
> > In paraview 3.x select the display tab and choose "Color by" to switch
> > from input scalars to rgb scalars. 
> 
> This works, but results in a strangely colored image which bears little
> resemblance to the visualisation in GRASS with d.rgb or r.composite.
> 
> How can a similar coloring scheme be achieved in Paraview like the one for
> the source data in GRASS ?
> 
> Peter
> 
> -------- Original-Nachricht --------
> > Datum: Thu, 18 Jun 2009 13:09:58 +0200
> > Von: "Sören Gebbert" <soerengebbert at gmx.de>
> > An: peter.loewe at gmx.de, grass-user at lists.osgeo.org
> > Betreff: Re: [GRASS-user] r.out.vtk RGB / input issue
> 
> > Hello Peter,
> > i have checked this issue. 
> > The behavior of r.out.vtk is correct.
> > 
> > An input must be provided, this is not optional.
> > To change this, you have to apply this little patch:
> > 
> > ===================================================================
> > --- parameters.c        (Revision 37861)
> > +++ parameters.c        (Arbeitskopie)
> > @@ -29,6 +29,7 @@
> >  void set_params()
> >  {
> >      param.input = G_define_standard_option(G_OPT_R_INPUTS);
> > +    param.input->required = NO;
> > 
> > 
> > 
> > If you use the rgb and the input parameter (which is the default), 
> > then you have to choose which data has should be displayed in your
> > visualization software. By default, the input scalars are the "active"
> > scalar array in the vtk output file.
> > 
> > e.g:
> > In paraview 3.x select the display tab and choose "Color by" to switch
> > from input scalars to rgb scalars. 
> > 
> > Best regards
> > Soeren
> > 
> > -------- Original-Nachricht --------
> > > Datum: Wed, 17 Jun 2009 15:18:23 +0200
> > > Von: peter.loewe at gmx.de
> > > An: grass-user at lists.osgeo.org
> > > Betreff: [GRASS-user] r.out.vtk RGB / input issue
> > 
> > > hi,
> > > 
> > > i am using v.out.vtk on grass6.3 on suse.
> > > 
> > > trying to export 2.5d rgb-maps to paraview using r.out.vtk always ends
> > up
> > > with an error message:
> > > 
> > > According to the module's manual it should be possible to export a
> > RGBmap
> > > + dem by using the parameters
> > > 
> > > rgbmaps=redmap,bluemap,greenmap elevation=my_dem output=result.vtk
> > > 
> > > However, the module reports that the INPUT parameter has to be
> provided.
> > > 
> > > trying 
> > > 
> > > input=rgbmap rgbmaps=redmap,bluemap,greenmap elevation=my_dem
> > > output=result.vtk
> > > 
> > > results in the same as 
> > > 
> > > input=rgbmap elevation=my_dem output=result.vtk
> > > 
> > > In both cases "result.vtk" is displayed with interpolated false
> colors.
> > > 
> > > How can a RGB composite created in GRASS properly be transferred and
> > > displayed in Paraview ?
> > > 
> > > Peter
> > > -- 
> > > Dr. Peter Löwe
> > > <peter.loewe at gmx.de>
> > > 
> > > 
> > > 
> > > 
> > > 
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> -- 
> Dr. Peter Löwe
> <peter.loewe at gmx.de>
> 
> 
> 
> 
> 
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