[vtkusers] Molecule structure

[Julien Alizier (free.fr)]

Hi José,

You may improve rendering speed using tricks in OpenGL.
The extensions GL_ARB_POINT_SPRITE and GL_NV_POINT_SPRITE may be very 
efficient.

See this previous post :
http://public.kitware.com/pipermail/vtkusers/2005-March/079009.html

and this document :
http://www.irisa.fr/orap/Forums/Forum17/Jean.Favre.ORAP.pdf


HTH
-- Julien



----- Original Message ----- 
From: "Paul Cochrane" <cochrane at esscc.uq.edu.au>
To: "José Alonso Romero Matías" <jarommat at gmail.com>
Cc: <vtkusers at vtk.org>
Sent: Thursday, April 28, 2005 6:30 AM
Subject: Re: [vtkusers] Molecule structure


> Jose,
>
> I've had similar problems with viewing 300,000 spheres in space.  The
> solution to the speed of the rendering was to use a vtkStripper filter 
> just
> before the vtkPolyDataMapper.
>
> Assuming you're generating a grid with spheres at the node points, the
> process is something like this:
>
> SphereSource -> Glyph3D -> Stripper -> PolyDataMapper -> Actor -> Render
>
> Hope that helps!
>
> Paul
>
> * José Alonso Romero Matías (jarommat at gmail.com) [050428 02:41]:
>> Hello,
>>
>> I am newby in VTK and Visualization, and I am searching tips for make a
>> molecule structure...
>>
>> I have a array of actors, one by an atom in my molecule...
>>
>> It functions well, but when the molecule has more than 100,000 atoms, the
>> renderization is very slow.
>>
>> Can you help me?
>>
>> Thanks
>>
>> -- 
>>
>> José Alonso Romero Matías
>> Prik Tehuacán
>
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>
> -- 
> Paul Cochrane
> Computational Scientist/Software Developer
> Earth Systems Science Computational Centre
> Rm 703, SMI Building
> University of Queensland
> Brisbane
> Queensland 4072
> Australia
>
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