I have to teach sketching paraboloids on paper by looking at it's equation. Last year when I taught this topic no one was interested in learning this particular thing. They felt the topic difficult and utter waste of time with so much hard work to do. I know that at first it's difficult to visualize this topic and it becomes a pain to sketch them on paper. But I think it really develops an analytic approach towards coordinate geometry and mathematics in general.
How do I motivate students to take it seriously? Which online source can I refer to supplement my knowledge about this particular topic?
I don't want to repeat what happened last year.