For spaghetti, do I need to remove the seeds, skin & top of the tomatoes?

@JohnZhau Need to? No. All parts are edible, though perhaps not pleasant to eat.

@LSchoon I wish I could upvote you a second time for the "function that is 1 if there is a knife in that point in space and 0 otherwise".

@JohnZhau remove the hard and fibrous stem bit. The rest is a matter of taste.

@Stephie I will out myself here - I usually don't remove that bit. I admit this is rather unusual in my experience and there is a high probability John Zhau will prefer his tomatoes without it - but as a pedant, I wanted to point out that it is not strictly required :)

@rumtscho Haha well, that is more or less how an SEM makes a picture...

@LSchoon it makes total sense, but I never thought of it that way. That's why it was such a satisfying "aha" moment.