[vtkusers] VTK with NVidia Optimus

[WangQ]

Hi,You may try disabling optimus in bios setting to see if works. At least this works with my DELL M4700 and direct opengl programming. Not 100% sure whether for VTK.Cheers,ChiangDate: Fri, 1 Jan 2016 18:42:17 +0100
From: paulo.waelkens at gmail.com
To: vtkusers at vtk.org
Subject: [vtkusers] VTK with NVidia Optimus

Dear all,
I'm trying to get my VTK 6.3 application to use the NVidia GPU on my laptop. The laptop (Dell Alienware) combines an intel HD530 with an Nvidia GTX970m using the NVidia Optimus technology. At the moment, my application always uses the integrated GPU, which is slow and horrible. Did any of you figure out how to make the NVidia Optimus driver choose the discrete GPU instead??? The laptop uses the discrete GPU for games, so it's not a hardware problem, I'd say. 
NOTE: I have both the latest intel and nvidia GPU drivers, and installed the intel driver first (as suggested somewhere). I've built VTK 6.3 with shared libraries and using the OpenGL2 flag.
I've followed the solutions described by nvidia, without success:http://developer.download.nvidia.com/devzone/devcenter/gamegraphics/files/OptimusRenderingPolicies.pdf- set the discrete GPU as the "Preferred graphics processor" => no effect- adding this line to my main.cppextern "C" {
 _declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
} //=>no effect

To check if the discrete GPU is being used, I use the GPU activity icon of the nvidia control panel (http://acer--uk.custhelp.com/app/answers/detail/a_id/9075/~/determining-which-graphics-card-is-used-with-nvidia-optimus). The icon does work correctly, since it shows activity when games are running (e.g. Starcraft 2). 
I figured maybe I need to add the extern "C" { _declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001; } line in the VTK source code somewhere. This is a bit of a wild guess, but maybe, since I'm linking to VTK dynamically, all the OpenGL stuff is done withing the VTK dll boundaries, so NVidia Optimus needs a hint from VTK, not from my (console) application that uses VTK.

I'm really running out of tricks here, and was wondering if one of you knows how to proceed.Thanks!

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