[vtkusers] VTK with two graphics card

[Frank Gao]

Hi Aashish,

 

Thanks for your reply. I figured out the problem. It's not the two card
problem. The code to acquire the dedicated graphics card memory returns a
large negative value, so the rendering code just returns.

 

The amount of memory is declared as vtkIdType, which is integer. So I
guessed two possibilities: the D3D code to return memory is run, or a long
integer is converted to an integer and resulted in a negative value.

 

We should upgrade to newer version soon. The GPU ray cast mapper returns
128MB if it cannot determine the graphics card memory size, which is too
small nowadays. 

 

Best regards,

Frank

 

From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf
Of Aashish Chaudhary
Sent: Sunday, November 17, 2013 8:58 AM
To: Frank Gao
Cc: vtkusers
Subject: Re: [vtkusers] VTK with two graphics card

 

Frank, 

 

Can you try the newer version of VTK (However, I am not sure if that will
change this behavior). 

 

This is Mac 10.8? 

 

- Aashish

 

On Sun, Nov 17, 2013 at 1:31 AM, Frank Gao <Frank.Gao at guidemia.com
<mailto:Frank.Gao at guidemia.com> > wrote:

Hello All,

There was a post last year related volume rendering with a system with two
graphics card (Posted by Ian Lindsay).  http://marc.info/?l=vtkusers
<http://marc.info/?l=vtkusers&m=133059379506480> &m=133059379506480. Here
again:

Many laptops have two graphics cards Intel HD and nVidia for example. I am
trying to do volume rendering. The LoadExtension call returns true, and I
went through the code, the system identified the nVidia card, all the
extensions are good. However, when the volume rendering is actually done,
obviously it goes to the HD card. Nothing is rendered.

This basically make the nVidia card useless. Please note it does not help if
I set the program to run with the high end card, and the HD card cannot be
disabled either.

Can somebody please help? By the way I am still using V5.4.

Your reply is highly appreciated.

Best regards,
Frank Gao


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-- 
| Aashish Chaudhary 
| R&D Engineer         
| Kitware Inc.            
| www.kitware.com <http://www.kitware.com>     

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