Why is there jaggedness when rendering metal?

As a beginner when I was trying to light, I didn’t know why there were strange shapes of jaggedness when rendering these metals


I hope someone can help me to solve this problem, thank you very much

This topic has been moved from International to Rendering.

When posting, please review the categories to ensure your topic is posted in the most relevant space. Hopefully, this category change will help to get you (and future devs!) the answers you seek :slight_smile: