3

I am not sure on whether you need to just see the object you want to cast it on, or if there must be a physically clear path to it.

Can the Amaterasu go through windows?

3

Yes, Amaterasu can pass through clear glass.

To quote the wiki

Amaterasu produces black flames at the focal point of the user's vision. - chapter 390 page 3

The focal point of a users vision is located at the back of the on the retina as seen on the image below.

This means that whatever is being 'seen' by a user at that time, will be cast ablaze. Comparable to how you can either focus on something beyond a window, or if the window is dirty, the window it self.

enter image description here

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