Hello, I guess that Qt3D has huge memory leaks.
You can check it on this example: https://github.com/igormironchik/3Dtree It's 3D tree, that grows year by year. By default tree will grow 5 years (5 minutes). When tree grown you can restart tree. And here I delete all resources: void MainWindowPrivate::createTree() { if(m_tree) { for(constauto&e:m_rootEntity->childNodes()) e->deleteLater(); } m_tree=newBranch(m_startPos,m_endPos,c_startBranchRadius, true,m_rootEntity); m_tree->setAge(0.0f); m_tree->updatePosition(); m_tree->placeLeafs(); } But a lot of memory are eaten.
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