Soft "inflate" on a rigid fram

I’m interested in soft “inflate” the surface inside a bounded curve or surfaces.
Is there such a tool in Rhinoceros?
Need the same effect as on this video.

This is Artcam with “Shape editor”

Is there a tool or plug-in that allows to automatically pull the surface on a rigid frame.
For example, awning, tent or umbrella


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You can see these links in Grasshopper

Some of the images from Nik Willmore disapeared recently as he was banned temporarily from grasshopper forum !!! So you will have to test scripts which seem to be still there.

Images are still on Google memory