It's a setting in the viewport shading options called "Cavity", as you can see in the video above.
It only shows in the viewport, not the render, but the reason I like to use it is because sometimes it's hard to see the edges of a mesh in the viewport with the default flat shading.
Keep in mind that if you have a lot of complex meshes in your scene, this can cause the viewport to lag.

Next up
My brother @Lit-Lore-Studios
has been making some awesome pixel art! Go check out his profile and give him a follow! 
#GJAsks What video game deserves to have a theme park ride?
Riven! It even has rides in it already, I'd love to see one irl!
Your fellow Jolters are still hard at work making GREAT #GameJoltColors25 art!
There's still time for YOU to be part of it. Check your quest log to get started.
All artists are tagged below! 🔽
Some perfume props I made in #Blender for my game "What Was Found at Ravenhill". I love sneaking my logo onto props like this as the branding 
@Distant-Dimensions ![]()
is a Jolter to Watch, self-taught 3D & 2D Artist, Animator, and Game Developer! Follow @Distant-Dimensions
![]()
before the quest ends on December 9 and you'll get Coins!
More progress on this #Blender scene... would you enter the door? 
Happy Joltidays! A new quest has entered your quest log. Accept the quest and follow @souptaels ![]()
to open today's slot on the calendar.




















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