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
#Devruary Day 10: What's your least favorite part of game dev?
Ngl, although I can do it, coding is the least enjoyable part of game dev to me
Even with visual scripting tools it can be hard... Pictured some code from my game Rivet 
#Devruary Day 16: What feature almost broke your game?
Moving things in pixels per second almost broke our game... When testing the game at 120fps everything moved in double time, so I had to add extra math to each line of code to calculate frame rate 
#Devruary Day 10: How do you usually plan a game dev project?
I often make checklists and sketches on physical paper and white boards, and I also prototype the game.
Happy #WIPWednesday! Are you working on a game? Making some art? Practicing a song? Something else? Tell us in the comments!
Not quite sure what I made with one of my students in #Blender today... But it's something 
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?
#Devruary Day 18: Which game dev inspires you most?
I'm really inspired by the developers behind No Man's Sky, Hello Games. They never gave up on their game after a failed launch, and made free updates for 10 years turning it into an amazing game today! 
Shop Crush is a hybrid visual novel, where you connect with customers, learn their characters, and untangle the dark, Literal Illusion puzzles about them.
The game's playtest has begun. We're celebrating with a quest!
Learn more: https://bit.ly/ShopCrushGJ
#Devruary Day 12: What tool or plugin saves you the most time in game dev? The Node Wrangler Plug-in for Blender saves me loads of time setting up materials! You just select your textures and with one click of a button they're all connected and set up! 

















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