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Hi， I am trying to use a WidgetSpriteViewport, but I am finding the results to be very abnormal. WidgetSpriteViewport's camera are using main camera's Modelview and .Projection function . But I have found it's different effect that in different position and functions ,as show blow: First, put it in front of the .update() function ,the result is object is shaking .Please see the file name is First . Second ,put it in end of the .update() function ,the result is object is shaking a little bit and it seems like lost material .Please see the file name is second . As mentioned above ,the situation happened that only use mat4 to change position ,and the object speed very fast (test is 1000 Meters per second).however it is not happen at lower speed . The main camera works fine, but when I set it to the WidgetSpriteViewport, it becomes very abnormal . The camera's position and look direction is changing every update. Thanks

I'm attempting to create a WidgetSpriteViewport using the cod from the example gui_02.cpp. Cutting and pasting this script into my script gets me a viewport that is always black. I can see the other bits of my GUI as well as the node in the editor but the viewport I've put into the gui is simply black. Anybody have any ideas as to why this could be?

Is there a simple way to make the background colour of a WidgetSpriteViewport completely transparent so that the viewport behind can be seen behind the objects drawn on the above viewport?