FrameBufer for effects

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alko

I use FrameBufer (aka. FBO) on libGdx for effects without shaders for economy.
E.g. drawing FBO in two position X- axis with alpha blending - Blur effect; or blitting region by rows - sine/perspective morphing, etc.
how can i replicate this on Godot?
I'm trying Viewport with clearmode Never, but foreground is clearing main color anyway.

alko

I just need disable clearing buffer.
I create Viewport with Clear_method = Never, and transparent BG
But nothing is visible on the screen
I don't understand, how works buffer in Godot

cybereality

Viewport at the correct method of you use clear never. However you need to have something in you viewport.. It is like another world in Godot. You can put the items as children of the viewport that is the easiest method but you can also get more advanced if you need

alko

cybereality I add child Sprite into Viewport.
But how render array spites per-frame? I change position in cycle ,but Sprite has placed to buffer at last element.