groups & components have a built in “Hide” & “Unhide” feature. You can assign individual entities to layers, or better yet, assign a group to a layer and everything inside that group will inherit the same layer assignment. This allows you to “turn the lights on or off” on any combination of objects, depending upon which layer you assign them to. It only assigns it to a certain “visibility channel”. When you put something on a layer, it doesn’t isolate or protect it in any way. If you are standing in a room and someone turns off the lights, can you still interact with the objects in the room even though you can’t see them? Of course! The same goes for layers in Sketchup. Layers will only change the visibility of an entity. Layers actually have a very specific purpose in Sketchup, but it has no effect on the STRUCTURE of your model. So naturally, when someone comes into Sketchup for the first time, they expect Sketchup layers to behave the same way. You can turn layers on or off to control visibility, but they also provide a way to separate objects from each other by assigning them to separate layers. Traditionally, the term “layers” is used in 2D programs for both structural and visual organization. This shell allows you to move and manipulate a collection of entities at the same time, and the contents of a group or component become protected from other entities outside of their group. Groups and components allow you to take any number of edges and faces and place them in an imaginary protective “shell”. Structural organization in Sketchup is handled using Groups, Components and the Outliner window. When modeling, there are two main things you want to have control over: Organizing the structure, and toggling the visibility of the different entities in your model. This article will help you understand how layers work in Sketchup, and also show you why groups & components may be a better way to organize your model. Most people start using Sketchup expecting layers to perform the same way, but quickly find out this is not the case. If you are used to working in a 2D program like AutoCAD or if you’ve ever used Photoshop, you probably understand the basic principles behind using layers.
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