Hi,
can you give more detail on what you are adding/removing? Do you use the
same vertex lists, but with new drawables. Do you change vertices, but
keep the drawables? To get more help you'd probably need to make a very
small example that shows the problem...
jp
fausto wrote:
Thank you both for your inputs.
To Robert:
Try writing the subgraph they are in out to a file then load this file
into osgviewer to see if can view them.
Yes, as I mentioned the new scene data is OK, I can see it while
debugging and after saving->loading it with osgViewer.exe all new
drawables appear in the scene, and previous ones are removed. So, the
scene is OK, the problem is really with the original viewer. It renders
OK, but doesn't update properly when drawables are added.
I'm rendering in Qt widgets, could that be the problem?
To D.J.
I might recommend refactoring the code to
add/remove nodes instead of drawables.
Unfortunately, I need nodes to be the same.
I keep searching and testing.
Thanks again for your help.
Cheers.
Fausto
On Thu, Jan 21, 2010 at 6:42 PM, D.J. Caldwell <[email protected]
<mailto:[email protected]>> wrote:
Hi Fausto and Robert,
If the simple modification is due to some specific user event (button
press, file dialog, etc.), I might recommend refactoring the code to
add/remove nodes instead of drawables. It sounds like you have no
trouble initially getting the geometry into the scene; it is the
simple modification that is the problem.
What I am suggesting here is a work-around, and not a fix (on my
system, it appears that there is no "bug" to fix). Other than this, I
believe the issue may be familiarity with the available patterns; that
is, using the right tool for the right job. No insult intended, but
the only fix for that is research, time, and patience.
The project I am part of uses visitors and/or swapping out vertices
for time based changes, and adding/removing nodes for user based
inputs.
Fausto, as Robert said, you are the only one who can know what is
appropriate for your project.
Just some things to consider; I hope this helps...
D.J.
On Thu, Jan 21, 2010 at 12:12 PM, Robert Osfield
<[email protected] <mailto:[email protected]>> wrote:
> Hi Fausto,
>
> Dynamically modifying the scene graph shouldn't be that hard.
> Removing drawables and adding news ones should perfect safe and
> shouldn't require and extra steps from you, no need to dirty bounding
> volumes or display lists, it should all just work.
>
> As to why your new drawables aren't appearing I can't say. Try
> writing the subgraph they are in out to a file then load this file
> into osgviewer to see if can view them. It could be simply that
there
> is something wrong with the geometry data you've set up. Only
you has
> your app and your data so you're the only one that can investigate.
>
> Robert.
>
> On Thu, Jan 21, 2010 at 4:41 PM, fausto <[email protected]
<mailto:[email protected]>> wrote:
>> Hi All,
>> I'm struggling to have a simple modification of an osg scene
working.
>> I simply need to remove all drawables from a geode and add new
drawables to
>> the same geode.
>>
>> In the viewer, the geode just disappears after removing the
drawables, but I
>> can see that the scene contains the geode with the new
drawables. So, it
>> seems a rendering problem.
>>
>> I see that many people have similar problems with dynamic
modifications.
>> I've read plenty of posts about setting display list to false, using
>> callbacks, dirtyBound(), etc....
>>
>> But I hope there is a clearer and easier way to achieve this.
>>
>> Please let me know.
>>
>> Thanks for any help.
>> Fausto
>>
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