Rendering quality less good than in 0.6

seinecle · Post by **seinecle** » 09 Feb 2010 11:40

Hi,

The visualizations I get with 0.7 are less appealing than in 0.6. I attach two screenshots for comparison.

I am not an expert of these issues, but has it to do with aliasing, or else?

Are there parameters I should change in 0.7 to arrive at visualizations as beautiful as in 0.6?

Looking forward an answer!

Clement
http://www.clementlevallois.net

: Viz with Gephi 0.7 (click to enlarge and see the aliasing)

: Viz with Gephi 0.6

Post by **admin** » 09 Feb 2010 12:34

Hi,

You can change the antialiasing status in menu > Tools > Visualization > OpenGL.

AA is at 4x by default, and runs to 16x. You have to restart Gephi to take these changes into account.

seinecle · Post by **seinecle** » 09 Feb 2010 13:36

Thx, but changing to 16 x did not improve the result though. If it might help, I see that the fps is moving around 21 for GEPHI 0.7, whereas it is stable a 8.0 for GEPHI 0.6 (for the same graph of course).

Any other tip to improve the rendering? It might seem trivial as compared to much more technical problems, but actually it is crucial to get this aesthetic feeling which visualizations with GEPHI 0.6 really had, and to which the viewers are very sensible.

Best,

Clement

Post by **admin** » 09 Feb 2010 14:00

Ok. Are you on Windows, Linux or Mac OS ?

seinecle · Post by **seinecle** » 09 Feb 2010 14:34

Windows 7.

Post by **mbastian** » 10 Feb 2010 10:13

Hum, that is strange as both 0.6 and 0.7 version use a bit the same code for initializing OpenGL. So on the same machine, 0.6 do antialising and 0.7 don't ?

I guess your graphic drivers are up to date, aren't they ? Do you have the possibility to try on an other OS on the same machine ?

Post by **jacomyma** » 10 Feb 2010 11:19

I noticed the same thing on my computer - faster, but a weak anti-aliasing even at 16x. Couldn't this be due to the new JOGL library ?

Post by **jacomyma** » 10 Feb 2010 11:25

Oho !!! I noticed something... The antialiasing 8x works fine, but the antialiasing 16x looks like "no anti-aliasing"... Thus is ugly !

8x aa looks good:

: 8x aa => Good !

16x aa doesn't work:

: 16x aa == 0x aa

Post by **mbastian** » 10 Feb 2010 12:35

Hum, thanks! I may see the problem. Either there is a bug on 16x antialiasing, I'll check this out, or your graphic card just don't support 16x antialising and therefore disable it. Indeeed not all graphic card has 16x antialising. I filed a bug to find this out.

seinecle · Post by **seinecle** » 10 Feb 2010 12:40

Excellent, this is looks like it could be the reason.

I post 3 screen shots to show that in terms of rendering,

gephi 0.7 anti-aliasing x 16 < gephi 0.7 anti-aliasing x 8 < gephi 0.6

My question: What is the anti-aliasing factor of gephi 0.6? Would the x16 in gephi 0.7 match it, or even do better?