mathober day 10: frustum

so. this one was a bit different. i didn't really know what a frustum was at all, nothing came to mind. so i actually had to do a bit of searching for this one...

so i searched and thought of this. and then after drawing it i kinda thought about how i think this is something also used in the context of 3d cameras for like, in game engines? idk. sounded kinda familiar after i read about them. that's all ig. i should post day 11 too...