Hi,

I've got 2 viewports in my application. One of them covers the entire
window, the other only covers a small portion of the screen. Is it possible
to make the small viewport transparent, so it inherits the background of its
"parent"?

I've tried to set a PolygonBackground on the small viewport with a
transparent material, but I get this runtime error during execution:

WARNING: PolygonBackground::clear: positions and texcoords have
different/invalid sizes (0 vs. 0)!

Thanks in advance.
       Frederik.
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