Round Corners -> Normal Camera of Standard Surface. Display> Show Hidden (right).

A scene file that demonstrates this effect can be found here.

 

 

 

Samples

Radius

Normal

Normal map -> bump2d -> Round Corners

 

Trace Set

Inclusive

Self Only

 

 

Further examples

Round Corners used to represent the meniscus where the rock meets the water surface (left). Round Corners -> normalCamera of Toon shader (right). Rollover images.