SDMitch Bevelmaker looks great, but looks like it doesn't work in recent SketchUp versions...

Thanks for the link pilou, now I understand why such plugin does not exist!

Tried your advice, didn't work as expected... Thanks though, I'll definitely use this trick on simpler geometry!

True, there are lots of ways to acheive a single thing usually.

But creating a crevice along a line like this, on a surface like this is a real pain with SketchUp native tools...

Well, yes and no. First, I didn't know the "Follow me" tool could be used this way, so thanks for teaching me that!
And I'd like the "crevice" to follow a line drawn on a surface (or mutliple surfaces), no matter its direction, just like in the screenshot below.

And let's suppose I want the "crevice" on a cylinder, your technique can't work because I would not be able to draw the crevice's section on the edge of the solid (if you know what I mean).

Hi everyone!

Is there any plugin similar to "Round Corners", but for planar surface?
It's kinda difficult to explain, so I edited a few screenshots to simulate what the plugin would be doing.

I'd be very helpful for me if something like that actually existed, thanks in advance for your answers!

Nevermind, that problem is dues to the curve being vetical. I put it on the horizontal axis and it doesn't invert my mesh anymore.
But now I have a new problem, it just doesn't generate it either... When the wireframe mesh appear, I validate by pressing enter, and nothing happens. The plugin closes itself but doesn't generate the bent mesh...