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

[David E DeMarle]

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>
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 <(518)%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 <(518)%20881-4909>
>>
>> On Fri, Jan 20, 2017 at 2:45 AM, Jiahui Luo <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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>>
>
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