Update guide.md

docs/guide/guide.md

-[[Home]](/docs/index.md)  [[User Guide]](/docs/guide/guide.md) [[Mesh Edit]](/docs/meshedit/overview.md) [[Path Tracer]](/docs/pathtracer/overview.md) [[Animation]](/docs/animation/overview.md)
-
----
-# User Guide
-
-## Modes and Actions
-
-The basic paradigm in Scotty3D is that there are six different _modes_, each
-of which lets you perform certain class of actions. For instance, in `Model` mode, you
-can perform actions associated with modeling, such as moving mesh elements and performing global mesh operations.
-When in `Animate` mode, you can perform actions associated with animation. Etc.
-Within a given mode, you can
-switch between actions by hitting the appropriate key; keyboard commands are
-listed below for each mode. Note that the input scheme may change depending on
-the mode. For instance, key commands in `Model` mode may result in
-different actions in `Render` mode.
-
-For the detailed documentation, see the guides of each mode: 
-- [Layout Mode](/docs/guide/layout.md)
-- [Model Mode](/docs/guide/model.md)
-- [Render Mode](/docs/guide/render.md), 
-- [Rigging Mode](/docs/guide/rig.md), 
-- [Animate Mode](/docs/guide/animate.md), 
-- [Simulate Mode](/docs/guide/simulate.md).
-
-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.
-
-![](../setup/scotty3d_gui.png)
-
-## Global Navigation
-
-In all modes, you can move the camera around and select scene elements. Information about your selection will be shown in the left sidebar.
-
-The camera can be manipulated in three ways:
-- Rotate: holding shift, left-clicking, and dragging will orbit the camera about the scene. Holding middle click and dragging has the same effect.
-- Zoom: using the scroll wheel or scrolling on your trackpad will move the camera towards or away from its center.
-- Translate: right-clicking (or using multi-touch on a trackpad, e.g., two-finger click-and-drag) and dragging will move the camera around the scene.
-
-## Global Preferences
-
-You can open the preferences window from the edit option in the menu bar.
-- Multisampling: this controls how many samples are used for MSAA when rendering scene objects in the Scotty3D interface. If your computer struggles to render complex scenes, try changing this to `1`.
-
-## Global Undo
-
-As is typical, all operations on scene objects, meshes, etc. are un and re-doable using Control/Command-Z to undo and Control/Command-Y to redo. These actions are also available from the `Edit` option in the menu bar.
+[[Home]](/docs/index.md)  [[User Guide]](/docs/guide/guide.md) [[Mesh Edit]](/docs/meshedit/overview.md) [[Path Tracer]](/docs/pathtracer/overview.md) [[Animation]](/docs/animation/overview.md)
+
+---
+# User Guide
+
+## Modes and Actions
+
+The basic paradigm in Scotty3D is that there are six different _modes_, each
+of which lets you perform certain class of actions. For instance, in `Model` mode, you
+can perform actions associated with modeling, such as moving mesh elements and performing global mesh operations.
+When in `Animate` mode, you can perform actions associated with animation. Etc.
+Within a given mode, you can
+switch between actions by hitting the appropriate key; keyboard commands are
+listed below for each mode. Note that the input scheme may change depending on
+the mode. For instance, key commands in `Model` mode may result in
+different actions in `Render` mode.
+
+For the detailed documentation, see the guides of each mode: 
+- [Layout Mode](/docs/guide/layout.md)
+- [Model Mode](/docs/guide/model.md) (Assigment2: MeshEdit)
+- [Render Mode](/docs/guide/render.md) (PathTracer)
+- [Rigging Mode](/docs/guide/rig.md) (Animation)
+- [Animate Mode](/docs/guide/animate.md) (Animation)
+- [Simulate Mode](/docs/guide/simulate.md) (Animation)
+
+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.
+
+![](../setup/scotty3d_gui.png)
+
+## Global Navigation
+
+In all modes, you can move the camera around and select scene elements. Information about your selection will be shown in the left sidebar.
+
+The camera can be manipulated in three ways:
+- Rotate: holding shift, left-clicking, and dragging will orbit the camera about the scene. Holding middle click and dragging has the same effect.
+- Zoom: using the scroll wheel or scrolling on your trackpad will move the camera towards or away from its center.
+- Translate: right-clicking (or using multi-touch on a trackpad, e.g., two-finger click-and-drag) and dragging will move the camera around the scene.
+
+## Global Preferences
+
+You can open the preferences window from the edit option in the menu bar.
+- Multisampling: this controls how many samples are used for MSAA when rendering scene objects in the Scotty3D interface. If your computer struggles to render complex scenes, try changing this to `1`.
+
+## Global Undo
+
+As is typical, all operations on scene objects, meshes, etc. are un and re-doable using Control/Command-Z to undo and Control/Command-Y to redo. These actions are also available from the `Edit` option in the menu bar.