[osg-users] Optimizer FLATTEN_STATIC_TRANSFORMS not all transforms are flattened

Sergey Lukashev lukashev.s at ya.ru
Thu Apr 25 05:43:23 PDT 2019

Thank you for responses!

Turns out my scene contained hanging leaf transforms and it was the issue. I removed them and now it works just fine.

Regarding the root node issue you have mentioned. I've noticed the variable name "nodeWeCannotRemove" and already tried adding a dummy Group above it but without it Optimizer will just apply the transform and set its matrix to identity. So it should work anyway.

Regards, Sergey.

25.04.2019, 11:26, "Robert Osfield" <robert.osfield at gmail.com>:
> Hi Sergey,
> The FLATTEN_STATIC_TRANSFORMS operation is not able to remove the
> topmost node so can't flatten this MatrixTransform you've added. This
> limitation is due to the optimization being called with external code
> holding a pointer/reference to that topmost node. To be able to
> optimize this topmost node away we'd need to come up with a new API
> that requires users to replace the pointer references they have.
> Without any API changes the way to get round this limitation is to
> have a Group node as the topmost node, then have the new
> MatrixTransform as a child of this group, then the original scene
> graph below the MatrixTransform.
> Robert.
> On Wed, 24 Apr 2019 at 21:16, Sergey Lukashev <lukashev.s at ya.ru> wrote:
>>  Hello, osg folks!
>>  I've used FLATTEN_STATIC_TRANSFORMS and it works quite good. However, now I need to rotate the scene, so I added a MatrixTransform on top of the root node. But it does not get flattened for SOME models. I properly set DataVariance of every Transform to STATIC before running the Optimizer. Can somebody point out where issue could come from and how to debug or solve it?
>>  --------------------------------------
>>  Regards, Sergey.
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