LD Virgin Question...

Hey!

So, finally taking part in my first LD. I've basically managed to get the whole weekend to myself so I'll have about as much time as one could hope to have in this kind of thing. But I had a question;

What is the stance on using engines in the compo?

I apologise if this is clearly answered somewhere and I've missed it but I was just wondering if using an engine excluded you from the compo. I get you're supposed to create everything from scratch but making an engine (and then a game in that engine) in two days seems like a fairly tall order. And if you CAN use engines, where is the line drawn between what you can and can't use? For example, obviously you can't use Unity's first person controller but can you use standard shaders or would you have to write your own?

Regardless of the answer, I'm almost certainly going to stick to the jam for my first game, but I would like to know. Looking forward to taking part!