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

["Peter Löwe"]

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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