Hi Eduardo,
I see your point. It is in fact a a "basic setting", but I meant that making the relation between the image that I posted (what I was trying to model) and the "basic feature" that solves it requires some serious experience. I have used AC for years and I did not know how to solve that...
Still, I am struggling with it. There seems to be some kind of bug in the 3D view. Up to a certain degree angle (in this case 70°), everything is OK. But when I keep on increasing the angle so that the recess occupies the whole wall...
Something strange happens ON THE OTHER SIDE of the window:
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There is some kind of distortion, but, as you can see, the plan does not show it, only the 3D window.
Any ideas?