Setting SubViewport size to always match root Viewport size

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I found a workaround. By setting the main Window’s content_scale_size to 0, 0 the node sizes always match the window size.

I added this to _ready():

if get_window().mode == Window.MODE_WINDOWED:
    get_window().content_scale_size = Vector2(0, 0)

Though take note that this messes up the scaling of CanvasItems outside the 3D Viewport, so this solution was not suitable for me.

What I ended up doing was ditching the whole SubViewportContainer and working with a TextureRect and a ViewportTexture instead. This is a little more work but allows for more control over the Subviewport.

Hope this helps someone else! :slight_smile:

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