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

[David E DeMarle]

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

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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