[vtkusers] Need information about "Invalid pixel format, no opengl support" message.

[Rakesh Patil]

Hi Ken Martin,


I believe I understood the core reason as why this message is displayed. I need some more details.


1) In what way OpenGL backend is different from the OpenGL2 backend for VTK 6.3. Knowing that QVTKWidget will be deprecated, what pre-requisite conditions needs to be considered to stick myself working with QVTKWidget on various system?

2) What exactly do you mean, when you say "one was provided to VTK that did not include opengl support". I guess all the latest Windows OS do come with OpenGL version greater than 1.1. So I think all the drivers must have OpenGL support right? Correct me if I am wrong.

3) Does this functionality really vary from one graphics card to another? I mean does it depend on the graphics card also? If so, how will I know whether my graphics card supports OpenGL backend or OpenGL2 backend?


Thank You


Warm Regards

Rakesh Patil

________________________________
From: Ken Martin <ken.martin at kitware.com>
Sent: Saturday, March 12, 2016 1:03 AM
To: Rakesh Patil
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] Need information about "Invalid pixel format, no opengl support" message.

I believe you gave the specs for your desktop as opposed to the laptop.

That message occurs on windows on the old OpenGL backend (and the OpenGL2 backend for VTK 6.3)  It indicates that VTK tried to setup a device context for rendering but the device did not support opengl, either because VTK failed to find a suitable device or because on was provided to VTK that did not include opengl support.

Thanks
Ken



On Wed, Mar 9, 2016 at 7:22 AM, Rakesh Patil <rakesh.p at tataelxsi.co.in<mailto:rakesh.p at tataelxsi.co.in>> wrote:

Hi VTK users,


I am facing a strange issue. I am using QVTKWidget in my application and it works very well on my desktop computer. The same code when I try to compile on my laptop it throws me this error message:


"Invalid pixel format, no opengl support"


I would like to know what are the scenarios in which VTK throws this message. Whether there is any dependency on various versions of Windows OS? I believe it should not be.  Below is the system information where I get this error:


OS Name: Microsoft Windows 8.1 Pro
Version: 6.3.9600 Build 9600
OS Manufacturer: Microsoft Corporation
System Manufacturer: Dell Inc.
System Model: Precision T1700
System Type: x64-based PC
Processor Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz, 3592 Mhz, 4 Core(s), 8 Logical Processor(s)
Installed Physical Memory (RAM): 32.0 GB
Total Virtual Memory: 36.7 GB
Display adapter: NVIDIA Quadro K620

Note: I am not using QVTKWidget2. Kindly give some feedback as early as possible.

Thank You

Warm Regards

Rakesh Patil


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