Real men -and women- don't draw buildings, they write them. Why limit yourself to one instance of a building when you could define an entire family?
It turns out writing building grammars is hard, it feels closer to programming. For procedural architecture to take off, creation tools must appeal to artists. All we have now are maddening languages and graph editors. Only a few artists have the skills to make any sense of them. I would like to find a solution for this, but I got nothing so far.
I have created a timelapse video where you can see me creating a grammar from scratch. It is for a family of simple, rustic houses like this one:
You can click on the image to see it in detail. This is a rendering of the triangles output by the grammar evaluation. This model has not been altered by hand.
Here is the video: