[JadeNB]

> All these models ignore how insects actually zero in on a smell.

It seems to me that the author is not ignoring that:

> While the flies now obey the laws of aviation, there's still something that seems missing. Normally, flies want to get indoors. They need to get indoors. So to simulate this, I added an attractor (maybe a rotting piece of fruit) at a position A indoors to lure the flies.

[lolc]

The model where the fly knows where the source of the smell is located the weird outcome of the flies targeting the pane in the middle instead of the sides where the smell escapes.