[vtkusers] plot a huge amount of spheres

[David E DeMarle]

My hazy recollection is that the point sprite approach will need to be
extended to support arbitrary shapes. The other two approaches should work
out of the box.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Thu, Aug 22, 2013 at 11:52 AM, Shawn Waldon <swaldon at cs.unc.edu> wrote:

> Hello all,
>
> I am working on a related issue the last few days.  I have something a
> little more complex that I am wanting to draw many copies of and I need the
> orientation to be controllable as well as the position.  Could I use a
> similar trick perhaps with glyphs for vectors?
>
> Thank you,
>
> Shawn Waldon
>
>
> On Thu, Aug 22, 2013 at 10:55 AM, David E DeMarle <
> dave.demarle at kitware.com> wrote:
>
>> Use a vtkPolyData with points on the locations, and a VTK_VERTEX cell
>> refering to each one.
>>
>> Then send that into vtkGlyph to have the CPU makes the spheres which then
>> get send to the card.
>>
>> Better yet, draw it with vtkGlyph3dMapper to make the spheres via vertex
>> programs on the GPU instead of the CPU.
>>
>> Better still, bring ParaView's point sprite plugin over, which will draw
>> the spheres via fragment programs on the GPU.
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>> On Thu, Aug 22, 2013 at 10:45 AM, Gib Bogle <g.bogle at auckland.ac.nz>wrote:
>>
>>> You need only multiple actors, all using the same mapper.
>>>
>>>
>>> On 23/08/2013 2:39 a.m., curator wrote:
>>>
>>>> Hi all,
>>>>
>>>> I am able to draw a vtkSphere with its own vtkSphere, vtkActor and
>>>> vtkMapper equipped together. Now if I need several spheres, I add multiple
>>>> instances of this stuff for each sphere and add them all up to the same
>>>> renderer - so far, so good.
>>>>
>>>> Now I need to draw a really huge amount of spheres, which are all
>>>> identical except the position. Is there any more efficient way to to that
>>>> than just creating N vtkActors, N vtkMappers and N vtkSpheres?
>>>>
>>>> regards,
>>>> curator
>>>> ______________________________**_________________
>>>> Powered by www.kitware.com
>>>>
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>>>
>>>
>>> --
>>> Dr. Gib Bogle
>>> Senior Research Fellow
>>> Auckland Bioengineering Institute
>>> University of Auckland
>>> New Zealand
>>>
>>> http://www.bioeng.auckland.ac.**nz <http://www.bioeng.auckland.ac.nz>
>>>
>>> g.bogle at auckland.ac.nz
>>> (64-9) 373-7599 Ext. 87030
>>>
>>>
>>> ______________________________**_________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at http://www.kitware.com/**
>>> opensource/opensource.html<http://www.kitware.com/opensource/opensource.html>
>>>
>>> Please keep messages on-topic and check the VTK FAQ at:
>>> http://www.vtk.org/Wiki/VTK_**FAQ <http://www.vtk.org/Wiki/VTK_FAQ>
>>>
>>> Follow this link to subscribe/unsubscribe:
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>>
>>
>> _______________________________________________
>> 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 VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
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>>
>
>
> --
> Shawn Waldon
> Graduate Research Assistant
> Department of Computer Science
> University of North Carolina at Chapel Hill
> swaldon at cs.unc.edu
>
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