YouTube - 動画概要欄 -
This technique is great for when you want a perfectly circular hole in a warped or curved surface. This is a step by step Blender beginner version of this topic.
More tips & video course, e-book and free sample e-book:
⇨ https://www.blendersecrets.org/
1-minute version:
⇨ https://youtu.be/b3mbiXNVPWQ