Non rectangular viewports in Layout?

[CalypsoArt]

Now that LO has updating dimensions, I'm giving it another chance. However, I can't find how to make a non-rectangular viewports. I found this youtube video but for some reason it will only play a few seconds then hangs. It's also from 2007, so I imagine there may be newer and better methods.

[TIG]

Clipped Viewport...
https://help.sketchup.com/en/article/95936

[Dave R]

You can't make non-rectangular viewports but you can use a shape drawn over the viewport to create a clipping mask. Position the unfilled shape over the viewport, select it and the viewport, right click on it and choose Create Clipping Mask.

[sonder]

I use clipping masks for all my sections, elevations and interior elevations. It works perfectly. You can assign the mask a line style as well which works great for interior elevations.