How to speed up a transparent QGraphicsTextItem in Opengl?

[JohannesMunk]

Hey Wysota!

I took the time and added the TextItem to the Widget3D Demo.



So whenever you have the time you are welcome to look at the code. If not, it'll stay that slow a little longer :->

Most relevant file is widget3d.h (CGL3dProjectedItem, CGL3dTextItem, ..).

There you can disable the cachemode. And it works just fine.

I think the core problem is: How can I use caching when the transformation and thus the boundingrect changes all the time?

Thx a lot for your help so far!

Johannes