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
Made this other-world scene in #Blender yesterday to use as a background on my website I'm making! Somewhat inspired by No Mans Sky
I quite like the way it turned out, especially for only a few hours of work
What do you think?
Made this found footage backrooms style animation in #Blender with one of my students... would you wander these halls? 
Here's a bit more about our game "(You're Not) Welcome to Rennville"! Whishlist now on Steam!
https://store.steampowered.com/app/4421860/Youre_Not_Welcome_to_…
Instead of doing #FanArtFriday, enter to win Opera GX’s #FirstStandArtContest!
This is your chance to win $5,000 USD! 💸
Art is your weapon. Garen is your champion.
Enter here: https://bit.ly/FirstStand
(We've included Garen variants for inspo!)
Not quite sure what I made with one of my students in #Blender today... But it's something 
Play @pm-studios
' Bandit Trap Open Beta!
Grab your rocket chairs, vacuums, and toilet tornadoes! Report one more time for our final beta! Live through March 23rd 6 am CET.
Complete quests based on the game!
Play the beta: https://bit.ly/BanditTrapBeta
Here's a time lapse of me modelling my #BanditTrap cupboard-boot trap I designed in #Blender! 
I made a fun furniture trap in #Blender inspired by Bandit Trap! What do you think?
This week's Fan Art Friday celebrates Bandit Trap! Accept the quest in your quest log to get started.
Defend your home or steal treasure in the open beta: https://bit.ly/BanditTrapBeta
Here's a screenshot of #MyBandit and #MyTrapper I made when testing Bandit trap! There's a GameJolt themed outfit for bandits, so of course I had to go for that! 














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