On Thu, Nov 22, 2018 at 3:40 AM Francois Chartier
<[email protected]> wrote:
>
> I have tried without the advanced options and the error message is that  
> Permission Denied.
>

Yes, you apparently do not that write permission in the directory in
which you try to create the VTK file.

> (Wed Nov 21 21:37:26 2018)
> r3.out.vtk input=nov817tension100@Toronto output=vtk 
> top=GTA_DEM_Raster@PERMANENT bottom=Rock@Toronto
> vtk: Permission denied

Agreed, could be more intuitive.

So I have beautified the error message in case that the output
directory is not writable:

# example
r3.out.vtk -s in=precip3d.500z50 top=dem500 bottom=bottom output=/bla.vtk
/bla.vtk: Permission denied
ERROR: Unable to open file </bla.vtk>

It will be part of the next GRASS GIS release.

Markus

-- 
Markus Neteler, PhD
http://www.mundialis.de - free data with free software
http://grass.osgeo.org
http://courses.neteler.org/blog
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