[Paraview-developers] Changing ParaView default CMake variable values

Wed Aug 31 15:06:46 EDT 2016

Thanks for the hint! “glxinfo | grep -i version” did the trick for me.

Regards,

Michael

P.S.: Unfortunately, for our cluster OpenGL 3.0 seems to be the norm, so I guess I will have to explicitly disable the new backend starting with 5.2.0…

On 30 Aug 2016, at 15:00 , Ken Martin <ken.martin at kitware.com<mailto:ken.martin at kitware.com>> wrote:

It is a little tricky as I think the answer is a combination of your hardware and your software. I'm not the best Linux person around so maybe someone else has a better answer. From a live system point of view I believe glxinfo will report the GL_VERSION your system supports. So anything 3.2 or later should be good for your default OpenGL. OSMesa is I think a bit different as I do not think glxinfo picks that up.

I have seen good results with the nvidia linux drivers on hardware from the past 5 years.

One other gotcha that has bitten us, is that there is an SGI patent that impacts Mesa's support for floating point textures. So some distros ship a version of Mesa that does not include floating point textures. This can cause issues depending on what you are rendering.

Hope that helps
Ken

On Mon, Aug 29, 2016 at 11:36 AM, Schlottke-Lakemper, Michael <m.schlottke-lakemper at aia.rwth-aachen.de<mailto:m.schlottke-lakemper at aia.rwth-aachen.de>> wrote:
Hi Ken,

Thanks for your reply. This is going to be an issue for us (as expected), as a quick check reveals that we use an older Version of OS Mesa on our cluster (of course, this can and will be changed eventually). Do you know if there an easy way to check if my hardware/Linux distro supports OpenGL 3.2 (we are using openSUSE)?

Yours

Michael

On 24 Aug 2016, at 16:19 , Ken Martin <ken.martin at kitware.com<mailto:ken.martin at kitware.com>> wrote:

I have a OpenGL2 document I try to keep up to date here

https://docs.google.com/document/d/1ojY_20mQbRyCfmgxe-LuPKi82x3XwPlU_KfFLeJoBvo/edit#heading=h.a92mikls63mw

I could probably be expanded some. The section on compatibility is currently as follows:

The new OpenGL2 backend typically requires OpenGL 3.2. Most hardware from 2010 or later should support OpenGL 3.2. For Linux systems that lack hardware support for OpenGL3.2, Mesa version 10.5.5 and later has been shown to work with VTK. OS Mesa requires version 11.2.

Apple Mac Pro with AMD Graphics Chips - there is/was a bug in some ATI drivers that causes picking and cell coloring to fail as of March 19th 2015. We have coded a workaround for the bug but it does impact performance significantly on Apple systems with AMD hardware. We have worked with Apple to fix the bug in El Capitan for most AMD cards they use.

Windows remote desktop only supports OpenGL version 1.4, the new backend will not work with this. Other options like VNC and nomachine should work.

Windows computers that DO NOT have an NVidia or AMD GPU will rely on their Intel GPU if present. Desktop and laptop Intel CPUs from IvyBridge (early 2012) or later should be fine as long as your drivers are up to date. Most Intel Xeon CPUs lack a GPU and some workstation CPUs (6 cores or more) do as well. In those cases you would need a dedicated GPU.

On Wed, Aug 24, 2016 at 9:36 AM, Schlottke-Lakemper, Michael <m.schlottke-lakemper at aia.rwth-aachen.de<mailto:m.schlottke-lakemper at aia.rwth-aachen.de>> wrote:
Hi Utkarsh,

Especially with the first change (rendering backend upgraded to OpenGL2) I suspect that some users might have builds fail because of missing dependencies on older systems (at least I expect it for some of our systems). Is there somewhere a list of library prerequisites that will change with this switch? I only know of http://www.paraview.org/Wiki/ParaView:Build_And_Install and there no OpenGL dependencies are listed explicitly.

Regards,

Michael

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On 24 Aug 2016, at 15:09 , Utkarsh Ayachit <utkarsh.ayachit at kitware.com<mailto:utkarsh.ayachit at kitware.com>> wrote:

Folks,

I wanted to propose changing the defaults for the following CMake
variables in ParaView:

VTK_RENDERING_BACKEND = OpenGL2 (currently OpenGL1)
VTK_ENABLE_KITS = ON (currently OFF)

The former will use the new rendering backend. The latter will build
fewer libraries since multiple VTK modules gets built as a single kit
library.

Thoughts? Any other suggestions?

Utkarsh
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