turn off collision detection?

[Methedrine]

Thanks Methedrine, so that gets rid of my boundingRect() calls, but I had discounted this approach because it also kills the repaint function for QGraphicItem objects that I've called .update() on.

I thought I might be able to apply the scene.invalidate() functions, but I still have to call QGraphicsScene.update() after each to get graphics updates, which ends up calling .boundingRect the same absurd number of times as when ViewportUpdate is on.

Is there another way to update just a single QRectF when indexing and viewportUpdate are both turned off?

Thanks,

Deacon

Why are you calling update on the QGraphicItems by yourself, if I may ask? What are you trying to achieve? You could certainly create a smaller scene from your already pre-processed QGraphicItems, but to me it currently sounds like you are actually re-inventing QGraphicsView then.

[Deacon]

Why are you calling update on the QGraphicItems by yourself, if I may ask? What are you trying to achieve? You could certainly create a smaller scene from your already pre-processed QGraphicItems, but to me it currently sounds like you are actually re-inventing QGraphicsView then.

I'm just trying to improve performance by limiting graphical updates to the items, which know when they need updated. When I allow scene.update() to do the job it goes through thousands of .boundingRect() calls, making any dynamic interaction with the screen take at least half of a second. Yes it is definitely reinventing much of QGV but its done already so I guess Ijust have to force paint() calls to make this work.