OpenSceneGraph Forum Forum Index OpenSceneGraph Forum
Official forum which mirrors the existent OSG mailing lists. Messages posted here are forwarded to the mailing list and vice versa.
 
   FAQFAQ    SearchSearch    MemberlistMemberlist    RulesRules    UsergroupsUsergroups    RegisterRegister 
 Mail2Forum SettingsMail2Forum Settings  ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
   AlbumAlbum  OpenSceneGraph IRC ChatOpenSceneGraph IRC Chat   SmartFeedSmartFeed 

OSG + Qt performance issue


 
Post new topic   Reply to topic    OpenSceneGraph Forum Forum Index -> General
View previous topic :: View next topic  
Author Message
Ale
User


Joined: 26 Nov 2012
Posts: 56

PostPosted: Wed May 30, 2018 3:13 pm    Post subject:
OSG + Qt performance issue
Reply with quote

Hi all,

we recently updated our project from OSG 3.4.0 + Qt 5.5 to OSG 3.6.0 + Qt 5.11.
We noticed a framerate slowdown without changing our code.

After some investigation we found that using VBO as we did until now the performance is bad but using display lists performance are equal or better than before.

The bottleneck seems to be in Draw step (in my test using VBO on screen statistics shows Draw timing greater than 100 since other timings are 0.3)

We choose to use VBO in the past becouse we potentially have very big geometries in a single node so choosing VBO we can increment visualization performance at first frame and avoid memory problems.

Now we saw very different code inside Drawable.cpp for display list management. So I guess if our choice of using VBO is still valid or do you think we can switch to display lists?


On the other side did someone experience this kind of problem with Qt 5.11 (or a version greater than 5.5)? Maybe there is a solution changing some Qt settings.

Thank you in advance.

Best regards
Ale
Back to top
View user's profile Send private message
robertosfield
OSG Project Lead


Joined: 18 Mar 2009
Posts: 12148

PostPosted: Wed May 30, 2018 5:13 pm    Post subject:
OSG + Qt performance issue
Reply with quote

Hi Ale,

Please update to 3.6.1 as it contains a change to how Drawable sets up
display lists and VBO's to avoid creating VBO's inside as this was
causing an issue for some users on certain hardware/drivers.

Robert.

On 30 May 2018 at 16:13, Ale Maro <> wrote:
Quote:
Hi all,

we recently updated our project from OSG 3.4.0 + Qt 5.5 to OSG 3.6.0 + Qt 5.11.
We noticed a framerate slowdown without changing our code.

After some investigation we found that using VBO as we did until now the performance is bad but using display lists performance are equal or better than before.

The bottleneck seems to be in Draw step (in my test using VBO on screen statistics shows Draw timing greater than 100 since other timings are 0.3)

We choose to use VBO in the past becouse we potentially have very big geometries in a single node so choosing VBO we can increment visualization performance at first frame and avoid memory problems.

Now we saw very different code inside Drawable.cpp for display list management. So I guess if our choice of using VBO is still valid or do you think we can switch to display lists?


On the other side did someone experience this kind of problem with Qt 5.11 (or a version greater than 5.5)? Maybe there is a solution changing some Qt settings.

Thank you in advance.

Best regards
Ale

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=73896#73896








------------------
Post generated by Mail2Forum
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    OpenSceneGraph Forum Forum Index -> General All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Similar Topics
Topic Author Forum Replies Posted
No new posts Dynamic VBO Performance Drop ravidavi General 2 Thu Dec 06, 2018 8:36 pm View latest post
No new posts osgUtil::LineSegmentIntersector perfo... Andrea74 General 6 Tue Dec 04, 2018 4:09 pm View latest post
No new posts DrawCallback serialization issue jumaroch General 1 Tue Nov 27, 2018 2:26 pm View latest post
No new posts DrawCallback serialization issue jumaroch General 0 Tue Nov 27, 2018 1:44 pm View latest post
No new posts DrawCallback serialization issue jumaroch General 0 Tue Nov 27, 2018 1:43 pm View latest post


Board Security Anti Bot Question MOD - phpBB MOD against Spam Bots
Powered by phpBB © 2001, 2005 phpBB Group
Protected by Anti-Spam ACP