[Therion] Wall visibility affecting lox model

[Martin Sluka]

> I've attached a mini project with the two versions of my ths file. One
> gives a good lox model, and one does not.

I'm not able to imagine what it means - check attachment. If there is  
a chimney, by my meaning, the border of chimney should by the wall,  
because it is wall, and only part which is inside the contours of the  
passage should the chimney line.

Another problem is transparent pit, because there is no passage below,  
so it is a hole to nowhere.

m.

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