fixes the regression reported by Mazoola about sloping walls (thanks for the details!).

It just took me a while to figure out when it did and did not display this behavior. [;)]

But a bit hard to follow without the sh3d file. Can you share it?

Hans -- Not sure which sh3d file you mean, but they're both (all?) small. I'll try to get them online when I get back to the house later tonight.

Maz