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 On Fri, Jan 20, 2017 at 2:45 AM, Jiahui Luo <luo...@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 > > > > > > _______________________________________________ > 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 > >
_______________________________________________ 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