QGraphicsEffect doesn t refresh correctly

[Marsel]

Hi,

Actually i have a QPolygonF who can only move horizontally and when it does, it draws an shadow effect from its initial point to his current. That works great but when i m moving the polygon too fast i got residual effects who doesnt clear correctly or some blank point appears in my shadows.
Anyone can help?

Thanks

[Marsel]

Resolved by calling the scene update method everytime my polygon s moving.