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Originally Posted by Reino
I can not explain better at the moment.
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Fortunately, there's no need to --- I think I've reproduced the issue.
The best way to avoid these "black polygon" issues is to make sure all of your polygons are convex (
http://mathworld.wolfram.com/ConvexPolygon.html ). I think the concave parts of the polygons can sometimes confuse the normal calculations on complex shapes like this one, and you end up with a polygon that's sometimes black, sometimes not. Also, it makes things easier if you end up exporting your models to have all-convex polygons.
I've attached a shot that shows a couple of methods for creating the surfaces for the steeple front:
The model on the left was surfaced using "Create Ordered Surface". I basically just selected a set of 3 or 4 vertices at a time in counter-clockwise order and perform a Vertex -> Create Ordered Surface. Repeat until the polygon is filled.
A faster method is to select all the front vertices and perform a Vertex -> Create Mesh -> ....
The model on the right used this method. The only caveat is that it creates surfaces across the concave parts that you have to delete, but that's generally easy to do in one of the 2D views.
Hope that helps.
Dennis