There are several ways to outline an object in Blender, but the most major way is to use FreeStyle. This time, I will introduce how to use Blender's FreeStyle.
What is Blender FreeStyle?
FreeStyle is a feature that allows you to add the contours of an object to your blender rendering. Its major feature is that you can easily draw lines in blender. As we will see later, you can create such a line with almost one click.
On the other hand, this FreeStyle extracts edges like a post process from the rendered result. Therefore, if it is a complicated model, unintended lines may be inserted, and flexible adjustment is a little difficult. Be careful because especially fine contours are easily crushed.