Hey ! When you model something complex or import it, the system resources cost can be really expensive. Creating a simplified version and generating a texture with a normal nap can be a good solution to reproduce the details, but cheaper ! 😁
Sometimes, you just want to use a seamless texture or a plain color on some part (or everywhere) of your mesh, then make a copy and just change a small part. This is how to use a texture channels to define these areas.
