Dear Cory,
Many thanks for Your reply.
On 07/01/15 04:17, Cory Quammen wrote:
vtkFollower won't work with the text glyph approach
you are proposing. The problem is that you need to rotate each of the
text glyphs independently to face the camera plane. If you generate a
set of 3D glyphs at each point, using a vtkFollower in the
representation will reorient the entire set of glyphs and not each
glyph independently. Does that make sense?
I think this would not be a problem because I would append all labels to a
single vtkPolyData and that would not be translated from the origin, so I'd
think that a rotation applied by the vtkFollower to that object should do the
trick. If I understand the general idea of representation plugins correctly, I
could just choose this kind of camera-follower representation for the appended
vtkVectorText object and the normal representations for other objects.
Let's assume for simplicity that I'd just want a 3D arrow to always point in the
same direction no matter how I rotate the view direction. Would that be possible
with this modified representation approach?
You might want to take a look at vtkDataLabelRepresentation in
ParaView. It draws cell ID and point ID labels oriented with the
camera plane.
I had a look and found an example from Utkarsh here:
http://public.kitware.com/pipermail/paraview/2012-May/024920.html
It works but has the same problem as the selection label tool: It draws the
labels as 2D text such that labels of hidden points (when using an intransparent
surface or volume representation) are still visible in front. For an orbiting
cam animation we need, this effect is very irritating when viewed with many labels.
I also tried to modify vtkDataLabelRepresentation* to use:
this->PointLabelMapper = vtkPolyDataMapper::New();
this->PointLabelActor = vtkFollower::New();
this->PointLabelProperty = vtkVectorText::New();
but it seems this needs many many changes in the code.
Although I'd love to have such functionality for the 3D-view of PV, one other
idea I just had: Is it possible to load a paraview scene within a python script
such that I'd do the creation of the animation there? Would it be possible then
to use vtkVectorText+vtkFollower?
Many thanks for Your help.
Roman
On Tue, Jan 6, 2015 at 5:58 AM, Dr. Roman Grothausmann
<grothausmann.ro...@mh-hannover.de> wrote:
Dear Cory,
Following Your suggestion, I tried to modify my current plugin to include a
new representation. However, I'm lost on how to combine the two things
together. The example at the wiki and the one I found from Utkarsh
(http://public.kitware.com/pipermail/paraview/2011-July/022296.html) replace
the Mapper and not the actor. So I'm not sure where to place the
text-plydata-generation in that case. Can You help me to get going with
this? My current attempt is attached.
Many thanks for Your help
Roman
PS: I tried to compile Utkarsh's example but it stops because the
UpdateSuppressor seems to be gone:
/net/home/grothama/vtk/paraview_plugins/Representation/vtkMySpecialRepresentation.cxx:43:53:
error: ?class vtkMySpecialRepresentation? has no member named
?UpdateSuppressor?
Would vtkMySpecialRepresentation need to be derived from
vtkPVUpdateSuppressor?
On 05/01/15 14:57, Cory Quammen wrote:
Hi Roman,
A representation plugin could probably do this. It would just need to
set its internal actor to an instance of vtkFollower and set the
camera from the view's renderer, which could be set by overriding the
AddToView(vtkView* view) method in your custom representation.
I hope that helps,
Cory
On Mon, Jan 5, 2015 at 8:24 AM, Dr. Roman Grothausmann
<grothausmann.ro...@mh-hannover.de> wrote:
Dear Utkarsh,
Needing the same thing as Willi, I've created a paraview plugin written
in
C++ doing basically the same as Your script. Would it be possible to
achieve
something like vtkFollower does from within a c++ PV plugin such that the
text always faces the camera? An other idea would be to use Python in the
animation view to rotate the text as the camera orbits. This would be a
workaround only for animations, which would suffice for me. Do You thing
that should be possible if nothing else works?
Many thanks for looking into this.
Roman
On 26/09/13 19:52, Utkarsh Ayachit wrote:
Alas, that's not easy to do, if at all possible, with Python source.
On Thu, Sep 26, 2013 at 5:48 AM, Willi Karel <w...@ipf.tuwien.ac.at
<mailto:w...@ipf.tuwien.ac.at>> wrote:
Dear Utkarsh,
would it be possible to synchronize the transform of the rendered
texts
to the transform of the camera, such that the planes in which the
texts
lie stay normal to the viewing direction?
I'm aware of vtkFollower, but I'm not sure if it is applicable /
how
to
make use of it in the context of ParaView / Programmable Source, as
it
derives from vtkActor.
Many thanks!
Willi.
--
Dr. Roman Grothausmann
Tomographie und Digitale Bildverarbeitung
Tomography and Digital Image Analysis
Institut für Funktionelle und Angewandte Anatomie, OE 4120
Medizinische Hochschule Hannover
Carl-Neuberg-Str. 1
D-30625 Hannover
Tel. +49 511 532-9574
--
Dr. Roman Grothausmann
Tomographie und Digitale Bildverarbeitung
Tomography and Digital Image Analysis
Institut für Funktionelle und Angewandte Anatomie, OE 4120
Medizinische Hochschule Hannover
Carl-Neuberg-Str. 1
D-30625 Hannover
Tel. +49 511 532-9574
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