With EraseOff: well, nothing is erased, so new data is added to the current data, and the image becomes a mess
With PreserveDepthBufferOn: it seems to work when I use it on my “StaticData” renderer. It’s the one that share its layer with the “points” renderer.
It does nothing when I call it on the “points” renderer, probably because its added first to the render window
So everything good now, thanks for your help