How to make the sides of a cube concave?

[karl]

Id like to design a cube where the four vertical sides are slightly concave.  Is a revolve (using the concave profile) the "best" way to do that?

[davebYYPCU]

Not if the corner edges have to be straight.

Use Loft to an indented centre point with Tangent option, or you get a four sided pyramid.

Might help….

[karl]

Thanks, but I want the four corner edges to curve in, too.

[laughingcreek]

I think you might want to better define the problem with a hand sketch or the like.  there are lots of interpretations for "a concave surface".

here's mine based on the current verbal description-

[karl]

Sorry for the ambiguity.  Here's what I'm going for (rectangular solid in example, not a cube):

[laughingcreek · Accepted solution]

sweep.

[karl]

Thanks!