Questions about Displacement and modeling Question 1: these lines appear after I did those dripping drops. They do not look odd in the final render, but I wondered how to remove them.

Question 2: the donut looks like made from Polyethylene. Please see the Nodes blew.



There is the final one, looks like a one-week-old donut. lol

There is the node.


Thanks for your time~
Answers found by myself.
1. there are duplicated vertices because I hit E and did not do anything then hit E again.
2. Aged donut because I forgot to give subsurface to the donut.

I hope this can help anyone who has the same problems. It is just so much to learn.