How to make the export image background become transparency.
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Description
I have tried many ways to make the background of the exported image transparent, such as use `view->setBlendMode(View::BlendMode::TRANSLUCENT)` and `o3dscene->SetBackground({0.f, 0.f, 0.f, 0.f})` . still no effect on the background. it always alpha 255, how can I make the background alpha become 0 when export image?
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