Re: [Paraview] [EXTERNAL] mapping scalars onto surface geometry

[Samuel Key]

Ken and Richardson CFD; Mapping data from a 3-D mesh to a 2-D surface that transects the 3-D mesh is very much of interest to me, particularly, with respect to STL 2-D surface definitions in 3-space. (My concern is with unstructured mesh simulations of solid objects.) For what it is worth, here is my experience using the Richardson CFD *.stl and *.vtk test files. Using ParaView (4.3.1): CASE [1]. (1) Load 'scalars.vtk' with all cell & point datum sets (2) Load 'sphere.stl' (3) Select 'scalars.vtk' and add the PV filter Resample With Dataset, (3.i) On the Change Input Dialog pop-up window, scalars.vtk is preselected as the input ("This property specifies the dataset from which to obtain probe values. The data attributes come from this dataset.") (3.ii) I then change the radio button to Source, and select sphere.stl as source ("This property supplies the dataset whose geometry will be used in determining positions to probe. The mesh comes from this dataset.") (4) Select the Resample With Dataset filters green Apply button, Everything appears to function properly. The outcome is the sphere.STL now has all on the point data from scalars.vtk to select for display, but on the sphere's surface points all the values are zero. CASE [2]: Substitute scalars.vtk with Clean to Grid filter output. Same results as Case [1] CASE [3]: Substitute sphere.stl with Delaunay 3D filter output. Same result as Case [1] CASE [4]: Case [2] and Case [3] combined. Same result as Case [1]. Clearly I am in over my head regarding how to move a datum set from one mesh to another in ParaView. Maybe it can't be done? Has someone else been able to do this? Samuel W Key FMA Development, LLC 1005 39th Ave NE Great Falls, Montana 59404 On 2/5/2016 12:52 PM, Moreland, Kenneth wrote: (Responding back to the group.) Well, that's strange. That should work. I notice that you originally said your scalars are in a structured grid, but the top of your data file says it is an unstructured grid. An unstructured grid can represent anything, so is there a possibility it does not represent the solid geometry you think it does? If you put a slice plane through it, does the slice and the fields on the slice look correct? Does it help if you run the "Clean to Grid" filter on the scalars? I'm really just guessing at potential problems here. It would help if you could send some example data that exemplifies the problem. -Ken From: Richardson CFD <gar...@gmail.com> Date: Friday, February 5, 2016 at 11:29 AM To: Kenneth Moreland <kmo...@sandia.gov> Subject: Re: [EXTERNAL] [Paraview] mapping scalars onto surface geometry Thanks - yes the data-sets definitely overlap.  The STL surface (blue) is well within the scalar flow field (red).  The scalars (in the flow field) are just imported as a vtk file: ASCII DATASET UNSTRUCTURED_GRID On Fri, Feb 5, 2016 at 5:48 PM, Moreland, Kenneth <kmo...@sandia.gov> wrote: That should work. Is it possible that the physical space of the two geometries do not overlap? Go to the information panel and look at the Bounds for the scalar field and the surface geometry. The bounds should overlap. If they do not, then you can use the Transform filter to move/scale one or both so that they are arranged in the same space. -Ken From: ParaView <paraview-boun...@paraview.org> on behalf of Richardson CFD <gar...@gmail.com> Date: Friday, February 5, 2016 at 10:41 AM To: "paraview@paraview.org" <paraview@paraview.org> Subject: [EXTERNAL] [Paraview] mapping scalars onto surface geometry How do you map a scalar field onto a surface geometry (STL file) please? I have a structured 3d array of values such as velocity, density, temperature etc... and I want to map that onto a surface geometry, such as a motorbike for example. I have tried the "Resample with Dataset" method,  (input=scalar field,  source=surface geometry) but I'm just getting a null field (zeros) for whichever scalar I then select to display on the surface. Thanks UFO-CFD This email has been sent from a virus-free computer protected by Avast. www.avast.com _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Search the list archives at: http://markmail.org/search/?q=ParaView Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/paraview

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