update doc

docs/building.md

@@ -82,4 +82,4 @@ Notes:
 
 Once you build Scotty3D successfully, run `Scotty3D` and you will see the following GUI
 
-![](building/scotty3d_gui.png)
\ No newline at end of file
+![](setup/scotty3d_gui.png)
\ No newline at end of file

docs/guide/guide.md

@@ -20,7 +20,7 @@ For the detailed documentation, see the guides of each mode: [Layout Mode](/docs
 The current mode is displayed as the "pressed" button in the menu bar, and available actions
 are are detailed in the left sidebar. Note that some actions are only available when a model/element/etc. is selected.
 
-![](../building/scotty3d_gui.png)
+![](../setup/scotty3d_gui.png)
 
 ## Global Navigation
 

docs/guide/model.md

@@ -23,6 +23,8 @@ and render with it, but editing will not be supported.
 
 ### Editing Mesh Elements
 
+Before you start, you should import the model from `./media` in `Layout Mode`. (See [Layout Mode](/docs/guide/layout.md) page for more details)
+
 In `Model` mode you can inspect mesh elements by
 left-clicking on vertices, edges, faces, and halfedges. Information about these
 elements will be shown in the left sidebar.