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In the last section, you made the simplest nav mesh that a level can have. The nav areas were marked from "PLAYER_START" to "FINALE". This allowed the flow to compute for the director to properly spawn in the Infected. There are other types of flows that Left 4 Dead uses. Every campaign consists of 5 levels:

* Level 1: PLAYER START to CHECKPOINT
* Level 2: CHECKPOINT to CHECKPOINT
* Level 3: CHECKPOINT to CHECKPOINT
* Level 4: CHECKPOINT to CHECKPOINT
* Level 5: CHECKPOINT to FINALE

A '''Checkpoint''' room is the "safe room" that the Survivors enter to transition from one level to another.

== Checkpoint Requirements ==

To make a checkpoint room, you'll need to have a minimum set of pieces set up in your level. This includes:

* A Checkpoint door – that the player uses to enter the room.
* An <code>info_changelevel</code> brush entity.
* An entity called an <code>info_landmark</code>.
* A nav area assigned with the CHECKPOINT attribute inside the room.
* A destination level to transition into.

The destination level also requires:

* A Checkpoint door – that the player uses to exit the room.
* An <code>info_landmark</code> with the same name as the previous level.
* A nav area labeled with the CHECKPOINT attribute inside the room.
* An <code>info_survivor_position</code> inside the Checkpoint Room.

== Create tutorial05.vmf ==
In the sdk_content directory, open the map called "tutorial03_complete.vmf" in Hammer. By default, it will be located at:
 C:\Program Files\Valve\Steam\SteamApps\common\left 4 dead\sdk_content\mapsrc\Your First L4D Level Tutorial

Choose '''Save As...''' from the '''File''' menu, and the rename the file "tutorial05.vmf". Go up one directory level and save it in your standard mapsrc directory with the rest of your maps at:
 C:\Program Files\Valve\Steam\SteamApps\common\left 4 dead\sdk_content\mapsrc

{{warning|A pre-generated navigation mesh is included for this section of the tutorial, so naming your maps exactly as specified is required for the map to work properly.}}

== Creating a Checkpoint Door ==
[[Image:l4d_hammer _checkpoint_01.jpg|thumb|right|300px|caption|Selecting prop_door_rotating_checkpoint from the Objects list.]]

Let's start with the Checkpoint door.

In the 3D Camera viewport, go to the upper story area in the 2nd room you created and look at the wall above the platform you created.

Click on the {{Hammer entity}} and select "<code>[[prop_door_rotating_checkpoint]]</code>" from the '''Objects''' drop-down menu.

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[[Image:l4d_hammer _checkpoint_02.jpg|thumb|right|500px|caption|Placing the prop_door_rotating_checkpoint.]]

In the Camera viewport, look at the corner where the platform meets the wall and left-click to place the <code>prop_door_rotating_checkpoint</code>.

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[[Image:l4d_hammer _checkpoint_04.jpg|thumb|right|500px|caption|Selecting the checkpoint door model.]]

Set the door model:
# Open up the '''Object Properties''' dialog box by pressing {{key|Alt}}+{{key|Enter}} or by going into select mode and double-clicking on it.
# Click on the '''World Model''' row and click on the '''Browse''' button on the right side. Type "checkpoint" in the '''Filter''' and select the model "<code>checkpoint_door_02.mdl</code>".
# Click on the '''OK''' Button.

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[[Image:l4d_hammer _checkpoint_03.jpg|thumb|right|500px|caption|Editing the properties of the checkpoint door.]]

Now, change the following properties:

* '''Name''': "checkpoint_entrance"
* '''Pitch Yaw Roll (Y Z X)''': "0 270 0"
* '''Disable Shadows''': "Yes"
* '''Spawn Position''': "Open counter-clockwise"

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[[Image:l4d_hammer _checkpoint_05.jpg|thumb|left|500px|caption|The checkpoint door in the Camera viewport.]]

Click on '''Apply''' and then close the properties.

You should now see a checkpoint door model in the Camera viewport.

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[[Image:l4d_hammer _checkpoint_06.jpg|thumb|left|500px|caption|Moving the checkpoint door into position.]]

Position the door so that it's sitting on the platform floor and inside the wall at the middle of the thickness of the wall. You may need to adjust the grid size to move it into position.

Now we have a place on the wall where we want to cut a hole for the door.

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==The Clipping Tool==

[[Image:l4d_hammer _clip_01.jpg|thumb|right|500px|caption|Selecting the wall that you will need to clip.]]

Instead of scaling and duplicating this wall brush that we need to cut a hole in, we're going to use the '''Clipping Tool''' to split our brush into the sections we need to make the hole.

Select the wall brush that the checkpoint door is sitting inside.

Select the [[Image:Hammer_ClippingTool.png]] '''Clipping Tool''' to enter clipping mode (You can also press {{key|Shift}}+{{key|X}}).

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[[Image:l4d_hammer _clip_02.jpg|thumb|right|500px|caption|Clipping the wall where the side of the door is.]]

In the '''Top''' viewport, left-click and drag down where the left edge of the door is.

Let go after the two points form a vertical line like in the image above.

You should be left with the brush split into a white outline and a red outline with the helper nodes of the clipping tool in place along the middle. The white outline signifies the part of the brush that will be left behind and the red outline shows what will be deleted.

Press {{key|Shift}}+{{key|X}} once. This will flip which side has the white outline and which side has the red outline.

Press {{key|Shift}}+{{key|X}} again. This will change the clipping mode to keep both sides of the split.

Press {{key|Enter}} to make the split. You can press {{key|Esc}} to exit the tool without any changes made.

Now that we have one cut made, we need to make a couple more. Select the wall brush with the door still sticking in it and enter the '''Clipping Tool''' again. 

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[[Image:l4d_hammer_clip_03.jpg|thumb|right|500px|caption|Clipping the wall in the other side of the door.]]

Decrease your grid size with {{key|[}} so that you can accurately clip along the edge of the right edge of the door and then left-click and drag to form a vertical line down that edge.

Press {{key|Enter}} to perform the split.

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[[Image:l4d_hammer_clip_04.jpg|thumb|right|500px|caption|Raising the brush above the door.]]

Select the brush that the door is still stuck inside and raise the bottom of it in the '''Side''' viewport so that it lines the top of the door model.

We now have the hole for our checkpoint door to sit in.

Remember that now that we've created a hole in our level, we need to seal it. We will seal this hole with the checkpoint room.

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[[Image:l4d_hammer_checkpoint_07.jpg|thumb|right|500px|caption|Move the pivot helper node to the side where the door will rotate.]]

Select the checkpoint door again for now and you'll notice that it has a blue sphere in the middle of it in the '''Camera''' viewpoint and a circle in the middle of it in the other viewports.

In the '''Top''' viewport, left-click and drag the hollow circle to the left edge of the brush like in this image.

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[[Image:l4d_hammer_checkpoint_08.jpg|thumb|right|500px|caption|Move the pivot helper node down to create an axis of rotation.]]

There should still be one circle/sphere at the center of the model. Drag this one to the same spot on the '''Top''' viewport but also drag it down in the '''Side''' viewport so that its under the first one that you dragged.

What you've done is make the <code>prop_door_rotating_checkpoint</code> use this line as the pivot for which way the door rotates, like the hinge on a real door.{{clr}}

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