Hi Steve,

> due to you wanting correct reflection rather than
> just stopping rendering artefacts.

A reflection that looks wavery and jittery _is_ a type of rendering artifact. But of course you won't notice it if you do a rendering without any reflection in it.

Reflection tends to substantially amplify any problems like little wiggles in geometry or irregularity in normals.

It's just another area that you don't have to worry about if you render with the NURBS vertex normals being used.

- Michael