[Paraview] OSPray rendering: ERROR: VolumeMapper's Input has no scalar array!

[Jiahui Luo]

Thank you, David.

I could not get your script to work.
Fortunately, I found another workaround.
Either change my source to provide PointData, or put a 
CellDataToPointData filter between the source and the resample filter.
Hope this is helpful for you.

Jiahui Luo

在 2017年01月21日 02:04, David E DeMarle 写道:
> nvm, already reported here: 
> https://gitlab.kitware.com/paraview/paraview/issues/17121
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
> On Fri, Jan 20, 2017 at 12:09 PM, David E DeMarle 
> <dave.demarle at kitware.com <mailto:dave.demarle at kitware.com>> wrote:
>
>     Please file a bug report on gitlab.
>
>     David E DeMarle
>     Kitware, Inc.
>     R&D Engineer
>     21 Corporate Drive
>     Clifton Park, NY 12065-8662
>     Phone: 518-881-4909 <tel:%28518%29%20881-4909>
>
>     On Fri, Jan 20, 2017 at 12:08 PM, David E DeMarle
>     <dave.demarle at kitware.com> wrote:
>
>         That's a bug in either the OSPRay mapper or the
>         ResampleToImage filter, depending on your point of view. To
>         workaround, put a python programmable filter into the pipeline
>         to annotate the array as being the "Active Scalars".
>
>         In it, choose:
>         Output Data Set Type = "Same as Input" //the default
>         check "Copy Arrays" //not the default
>         for script use
>         :self.GetOutput().GetPointData().SetActiveScalars("RTData")
>
>         David E DeMarle
>         Kitware, Inc.
>         R&D Engineer
>         21 Corporate Drive
>         Clifton Park, NY 12065-8662
>         Phone: 518-881-4909 <tel:%28518%29%20881-4909>
>
>         On Fri, Jan 20, 2017 at 2:45 AM, Jiahui Luo <luo229 at gmail.com
>         <mailto:luo229 at gmail.com>> wrote:
>
>             Hi ,
>             I got an error message when trying to do volume rendering
>             on the output of the ResampleToImage filter:
>
>                 ERROR: In
>                 /home/user/apps/paraview5.2.0-build/superbuild/paraview/src/VTK/Rendering/OSPRay/vtkOSPRayVolumeMapperNode.cxx,
>                 line 107
>                 vtkOSPRayVolumeMapperNode (0x68c2ad0): VolumeMapper's
>                 Input has no scalar array!
>
>             Here is how it happened.
>             First, I added a ProgrammableSource with Output DataSet
>             Type set to vtkRectilinearGrid and apply something like this,
>
>                 import numpy as np
>
>                 # Read x,y,z,th from file
>
>                 xCoords = vtk.vtkDoubleArray()
>                 for i in x:
>                     xCoords.InsertNextValue(i)
>
>                 yCoords = vtk.vtkDoubleArray()
>                 for i in y:
>                     yCoords.InsertNextValue(i)
>
>                 zCoords = vtk.vtkDoubleArray()
>                 for i in z:
>                     zCoords.InsertNextValue(i)
>
>                 output.SetDimensions(len(x), len(y), len(z))
>                 output.SetXCoordinates(xCoords)
>                 output.SetYCoordinates(yCoords)
>                 output.SetZCoordinates(zCoords)
>
>                 thArray = vtk.vtkFloatArray()
>                 thArray.SetName("Temperature")
>                 thArray.SetNumberOfComponents(1)
>                 thArray.SetNumberOfTuples(nx*ny*nz)
>                 for k in range(nz):
>                     for j in range(ny):
>                         for i in range(nx):
>                             index = i+j*nx+k*ny*nx
>                 thArray.SetValue(index, th[k,j,i])
>                 output.GetCellData().SetScalars(thArray)
>                 return output
>
>             Since volume rendering can not be done on rectilinear
>             grid. I added a ResampleToImage filter on this source.
>
>             Then I could do volume rendering using Ray cast or GPU
>             based, but not OSPray and the above message popped up.
>
>             How to make this work? Thanks.
>
>             Jiahui Luo
>
>
>
>
>
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