Question about how to export scene as EPS

[TomTranter]

Firstly, I have found your examples very useful and my apologies if this is not the right place to ask such questions. I'm attempting to export a scene as an EPS using vtk.vtkGL2PSExporter() but I receive the following message: NotImplementedError: no concrete implementation exists for this class. I installed vtk for python3 from http://www.lfd.uci.edu/~gohlke/pythonlibs/ I realize the GL2PS program is separate from VTK but I'm not sure how to install it or whether it would be possible to get vtk to use it from the python interface.

[lorensen]

Tom,

This works for me. Can you try it?

import vtk

This example uses a "glyph table" to change the shape of the 3d glyphs

according to a scalar value.

NOTE: The vtkGlyph3D filter doesn't copy over scalars to the glyphs

generated by a table like this for some reason...

The Wavelet Source is nice for generating a test vtkImageData set

rt = vtk.vtkRTAnalyticSource() rt.SetWholeExtent(-2,2,-2,2,0,0)

Take the gradient of the only scalar 'RTData' to get a vector attribute

grad = vtk.vtkImageGradient() grad.SetDimensionality(3) grad.SetInputConnection(rt.GetOutputPort())

Elevation just to generate another scalar attribute that varies nicely

over the data range elev = vtk.vtkElevationFilter()

Elevation values will range from 0 to 1 between the Low and High Points

elev.SetLowPoint(-2,-2,0) elev.SetHighPoint(2,2,0) elev.SetInputConnection(grad.GetOutputPort())

Create simple PolyData for glyph table

cs = vtk.vtkCubeSource() cs.SetXLength(0.5) cs.SetYLength(1) cs.SetZLength(2) ss = vtk.vtkSphereSource() ss.SetRadius(0.25) cs2 = vtk.vtkConeSource() cs2.SetRadius(0.25) cs2.SetHeight(0.5)

Set up the glyph filter

glyph = vtk.vtkGlyph3D() glyph.SetInputConnection(elev.GetOutputPort())

Here is where we build the glyph table

that will be indexed into according to the IndexMode

glyph.SetSourceConnection(0,cs.GetOutputPort()) glyph.SetSourceConnection(1,ss.GetOutputPort()) glyph.SetSourceConnection(2,cs2.GetOutputPort())

glyph.ScalingOn() glyph.SetScaleModeToScaleByScalar() glyph.SetVectorModeToUseVector() glyph.OrientOn() glyph.SetScaleFactor(1) # Overall scaling factor glyph.SetRange(0, 1) # Default is (0,1)

Tell it to index into the glyph table according to scalars

glyph.SetIndexModeToScalar()

Tell glyph which attribute arrays to use for what

glyph.SetInputArrayToProcess(0,0,0,0,'Elevation') # scalars glyph.SetInputArrayToProcess(1,0,0,0,'RTDataGradient') # vectors

I would call Update if I could use the scalar range to set the color map

range

glyph.Update()

coloring_by = 'RTData' mapper = vtk.vtkPolyDataMapper() mapper.SetInputConnection(glyph.GetOutputPort()) mapper.SetScalarModeToUsePointFieldData() mapper.SetColorModeToMapScalars() mapper.ScalarVisibilityOn()

GetRange() call doesn't work because attributes weren't copied to glyphs

as they should have been...

mapper.SetScalarRange(glyph.GetOutputDataObject(0).GetPointData().GetArray(coloring_by).GetRange())

mapper.SelectColorArray(coloring_by) actor = vtk.vtkActor() actor.SetMapper(mapper)

ren = vtk.vtkRenderer() ren.AddActor(actor) renWin = vtk.vtkRenderWindow() renWin.AddRenderer(ren) iren = vtk.vtkRenderWindowInteractor() istyle = vtk.vtkInteractorStyleTrackballCamera() iren.SetInteractorStyle(istyle) iren.SetRenderWindow(renWin) ren.ResetCamera() renWin.Render()

iren.Start()

exporter=vtk.vtkGL2PSExporter() exporter.SetRenderWindow(renWin); exporter.SetFileFormatToPDF(); exporter.CompressOff(); exporter.SetSortToSimple(); exporter.DrawBackgroundOn(); exporter.SetFilePrefix("test"); exporter.Write();

On Tue, Aug 1, 2017 at 10:15 AM, Tom Tranter [email protected] wrote:

Firstly, I have found your examples very useful and my apologies if this is not the right place to ask such questions. I'm attempting to export a scene as an EPS using vtk.vtkGL2PSExporter() but I receive the following message: NotImplementedError: no concrete implementation exists for this class. I installed vtk for python3 from http://www.lfd.uci.edu/~ gohlke/pythonlibs/ I realize the GL2PS program is separate from VTK but I'm not sure how to install it or whether it would be possible to get vtk to use it from the python interface.

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[TomTranter]

Hi @lorensen, thanks for the reply. The line setting the mapper range falls over but I commented it out and got the VTK window with all the glyphs. When I press 'Q' it closes and I get the following error message in another VTK window when this line is run 'exporter=vtk.vtkGL2PSExporter()' Generic Warning: In D:\Build\VTK\VTK-7.1.1\IO\Export\vtkGL2PSExporter.cxx, line 26 Error: no override found for 'vtkGL2PSExporter'. Perhaps the binary I downloaded does not have the correct compiler options - http://vtk.1045678.n5.nabble.com/GL2PSExporter-issue-td5738900.html

[lorensen]

The binary probably does not have those settings. Perhaps oyu can check with the owner of the binary.

On Fri, Aug 4, 2017 at 11:23 AM, Tom Tranter [email protected] wrote:

Hi @lorensen https://github.com/lorensen, thanks for the reply. The line setting the mapper range falls over but I commented it out and got the VTK window with all the glyphs. When I press 'Q' it closes and I get the following error message in another VTK window when this line is run 'exporter=vtk.vtkGL2PSExporter()' Generic Warning: In D:\Build\VTK\VTK-7.1.1\IO\Export\vtkGL2PSExporter.cxx, line 26 Error: no override found for 'vtkGL2PSExporter'. Perhaps the binary I downloaded does not have the correct compiler options

• http://vtk.1045678.n5.nabble.com/GL2PSExporter-issue-td5738900.html

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