[Paraview] Project polygon onto surface

[Adam Dershowitz]

The problem I was having is that I was planning and trying  to use a polygon.  It seems that if you try to use that Slice Along Polyline, but select a polygon for the input, it crashes paraview (it should probably bring up an error, or only allow a polyline!).  I realized that it actually wants a polyline, and once I created one for my region, the filter does what I had been looking for.  
But, that leads to another question…  If I want a whole region to be another color, is there a way to fill the output of SliceAlongPolyLine?  So, instead of just an outline, I can get the inside to also be a certain color?  

Thanks for the help.  


-- Adam


On 10/26/16, 10:10 AM, "Adam Dershowitz" <adershowitz at exponent.com> wrote:

    I tried it a few times, and it kept crashing Paraview.  So, then I read up on, it and seemed, from the description, that it was not what I wanted anyway.  But, if you think it is, I will see if I can get it to work.  
    
    -- Adam
    
    
    
    
    
    
    
    
    
    On 10/26/16, 1:01 AM, "postgurke at web.de" <postgurke at web.de> wrote:
    
    >Adam,
    >
    >Have you actually tried the filter? Because I think the output is exactly what
    >you're asking for: the "section" of the surface is the part of the surface where
    >the polyline is proceted onto it, hence a polyline with the regarding topography
    >values for the respective z coordinates.
    >
    >Cheers
    >Venke
    >
    >
    >
    >> Adam Dershowitz <adershowitz at exponent.com> hat am 25. Oktober 2016 um 17:29
    >> geschrieben:
    >> 
    >> 
    >> I don't think that will do it.  Because, I don't want to slice anything.
    >> I just want to show the boundaries on the 3D surface.  I want to project the
    >> polygon that marks the edges of a region, onto the 3D topography.  
    >> It seems that Slice Along Polyline uses a laser to cut a section of the
    >> surface, according to the instructions.  Instead I want to see each spot where
    >> the laser hits on the surface.  
    >> 
    >> ________________________________________
    >> From: postgurke at web.de [postgurke at web.de]
    >> Sent: Tuesday, October 25, 2016 11:13 AM
    >> To: Adam Dershowitz; paraview at paraview.org
    >> Subject: Re: [Paraview] Project polygon onto surface
    >> 
    >> Hi Adam
    >> 
    >> I think the Slice Along Polyline Filter is what you need. Just select the data
    >> set and the poly line in the window popping up and then proceed in the
    >> properties section as usual.
    >> 
    >> Cheers
    >> Venke
    >> 
    >> 
    >> 
    >> > Adam Dershowitz <adershowitz at exponent.com> hat am 25. Oktober 2016 um 16:01
    >> > geschrieben:
    >> >
    >> >
    >> > Is there a way to project a 2D, or 3D polygon onto a surface.
    >> > Specifically I have some elevation data, that is displaying fine.  But the
    >> > data has a lot of vertical variation.  I have a polygon that represents the
    >> > boundaries of different regions.  So, the polygon is effectively 2D.
    >> >  Although, I can give it a 3D values as well.
    >> > The difficulty is that I can know the elevation of the corners, but the
    >> > lines
    >> > between those corners often drop "underground".
    >> > So I would like to project the 2D (or 3D) polygon region onto the 3D ground
    >> > elevation.
    >> > You can think of this as having a topo map and I want to show the lines
    >> > around
    >> > an individual piece of property.
    >> > Is there a filter that can do this?
    >> >
    >> > Thanks,
    >> >
    >> > --Adam
    >> >
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