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
Here are some more renders of the puzzle box I made in #Blender for my game "What Was Found at Ravenhill" 
#Devruary Day 2: What was the first game you ever made?
I made a lot of small game projects, but the first game I ever finished and uploaded for other people to play was "7th Heaven" over 13 years ago! It's nice to look back and see how far I've come! 
#Devruary Day 3: What game made you want to be a dev? One of the games that made me want to make my own game worlds is Riven, which I've spoken about many times before 
Happy #WIPWednesday! Are you working on a game? Making some art? Practicing a song? Something else? Tell us in the comments!
#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 Devruary! Devruary Day 12 celebrates @ddbalabag
! They're the game dev behind Book and Horn! We also have a question for the devs of Game Jolt: What tool or plugin saves you the most time in game dev?
#Devruary Day 8: What engine are you using in your current game? I'm currently working on two different games, for my puzzle game What Was Found at Ravenhill I'm using Visionaire Studio. For the game "You're Not Welcome to Rennville I'm using Construct 2
#Devruary Day 9: What's your favorite part of game dev? As I've mentioned before, I love being able to create my own worlds to explore!
I also really like sound design, it's a fun way to add a lot of detail to the experience.
Happy Devruary! Devruary Day 11 celebrates @Asthon_ES
! They're an Indie studio recently created to produce their own games including Magic Frog! We also have a question for the devs of Game Jolt: How do you usually plan a game dev project?
#Devruary Day 4: What keeps you making games when it gets tough?
I love creating worlds (just like the games I mentioned inspiring me), so sometimes the motivation is being able to see those worlds come together and explore them myself! 















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