Weird artifacts in ParaFoam

cwang5 · January 12, 2011, 06:16

Hi guys,

I've recently been seeing these weird artifacts when post-processing using ParaFoam when viewing slices:

I have not seen anything like this before in OF1.6, and haven't noticed this in OF1.7 until now (since I haven't been using the slice function before this). Any idea on how to fix this problem? Thanks.
My system is OpenSUSE 11.3 with ATI graphic card, if that helps.

John

cwang5 · January 13, 2011, 00:47

Well, after some investigation it appears that the ATI driver is at fault. The flow field rendered correctly when using mesa driver through SSH.

John

wyldckat · January 13, 2011, 18:00

Hi John,

Well, you got lucky that you only got artifacts. Some people aren't so lucky and get complete crashes of their machines, because the OpenGL driver (from the closed source ATI/NVidia/Intel drivers) put its finger in the wrong bits of memory, or GPU instructions, in the graphics card.

You can try downgrading your ATI drivers to a previous version or upgrading to the most recent version. The other possibility is that you have enabled the nifty and sweet hardware acceleration for desktop display; you may loose eye candy when working on the desktop, but then it might be less likely that some application will crash due to it.

Best regards,
Bruno

January 12, 2011, 06:16	Weird artifacts in ParaFoam	#1
cwang5 Member John Wang Join Date: Mar 2009 Location: Singapore Posts: 73 Rep Power: 18	Hi guys, I've recently been seeing these weird artifacts when post-processing using ParaFoam when viewing slices: I have not seen anything like this before in OF1.6, and haven't noticed this in OF1.7 until now (since I haven't been using the slice function before this). Any idea on how to fix this problem? Thanks. My system is OpenSUSE 11.3 with ATI graphic card, if that helps. John

January 13, 2011, 18:00		#3
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,981 Blog Entries: 45 Rep Power: 129	Hi John, Well, you got lucky that you only got artifacts. Some people aren't so lucky and get complete crashes of their machines, because the OpenGL driver (from the closed source ATI/NVidia/Intel drivers) put its finger in the wrong bits of memory, or GPU instructions, in the graphics card. You can try downgrading your ATI drivers to a previous version or upgrading to the most recent version. The other possibility is that you have enabled the nifty and sweet hardware acceleration for desktop display; you may loose eye candy when working on the desktop, but then it might be less likely that some application will crash due to it. Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[OpenFOAM] Weird Problem with ParaFoam via SSH	cwang5	ParaView	2	July 19, 2010 09:00
[OpenFOAM] pointVectorField in ParaFoam	s_braendli	ParaView	0	April 22, 2010 08:36
[OpenFOAM] Segmentation fault with paraFoam and paraview 3.6.1 on Fedora 11 32 and 64 bit	nanes	ParaView	2	September 11, 2009 09:12
[OpenFOAM] Parafoam basic questions	qtian	ParaView	0	July 20, 2007 11:52
[OpenFOAM] ParaFoam OF 14 decomposed cases	philippose	ParaView	4	April 18, 2007 05:17

January 13, 2011, 00:47		#2
cwang5 Member John Wang Join Date: Mar 2009 Location: Singapore Posts: 73 Rep Power: 18	Well, after some investigation it appears that the ATI driver is at fault. The flow field rendered correctly when using mesa driver through SSH. John