Jellby wrote:

> Hello,
> 
> Have you ever felt that the standard scaling is not what you need? I was 
> thinking about that and it occurred to me that it could be interesting to 
> be able to grow or shrink an object not relative to the origin (as with the 
> standard scaling) but perpendicularly to its surface. Does this have any 
> sense? It would be equivalent for some simple shapes: sphere, cube... but 
> for others it would be like changing the threshold value (for blobs), or 
> altering the minor radius (for tori)...
> 
> I know this is more than probably not easy (impossible?) to do, and maybe 
> it's not interesting at all, but well, I lose nothing by writing it here :)


It's been done already (as a patch of 3.1) for mesh,
  see http://jgrimbert.free.fr/pov/patch/tessel/index.html#displace
It works better with smoothed mesh, because otherwise the 
displacement/growth along the normal create a lot of holes in the mesh
(but that can be a desired effect...)

Given the way Pov works, your idea is only possible with mesh and 
mesh-compatible objects.

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