Setting up the game area

In this first part, we're going to set up the game area. Let's get started by importing the start assets and setting up the game scene.

We've prepared a Godot project with the 3D models and sounds we'll use for this tutorial, linked in the index page. If you haven't done so yet, you can download the archive here: Squash the Creeps assets.

Once you downloaded it, extract the .zip archive on your computer. Open the Godot Project Manager and click the Import button.

In the import popup, enter the full path to the freshly created directory squash_the_creeps_start/. You can click the Browse button on the right to open a file browser and navigate to the project.godot file the folder contains.

Click Import & Edit to open the project in the editor.

A window notifying you that the project was generated by an older Godot version may appear. Click Convert Full Project to convert the project to your current Godot version.

The start project contains an icon and two folders: art/ and fonts/. There, you will find the art assets and music we'll use in the game.

There are two 3D models, player.glb and mob.glb, some materials that belong to these models, and a music track.

Setting up the playable area

We're going to create our main scene with a plain Node as its root. In the Scene dock, click the Add Child Node button represented by a "+" icon in the top-left and double-click on Node. Name the node Main. An alternate method to rename the node is to right-click on Node and choose Rename (or F2). Alternatively, to add a node to the scene, you can press Ctrl + A (Cmd + A on macOS).

Save the scene as main.tscn by pressing Ctrl + S (Cmd + S on macOS).

We'll start by adding a floor that'll prevent the characters from falling. To create static colliders like the floor, walls, or ceilings, you can use StaticBody3D nodes. They require CollisionShape3D child nodes to define the collision area. With the Main node selected, add a StaticBody3D node, then a CollisionShape3D. Rename the StaticBody3D to Ground.

Your scene tree should look like this

A warning sign next to the CollisionShape3D appears because we haven't defined its shape. If you click the icon, a popup appears to give you more information.

To create a shape, select the CollisionShape3D node, head to the Inspector and click the <empty> field next to the Shape property. Create a new BoxShape3D.

The box shape is perfect for flat ground and walls. Its thickness makes it reliable to block even fast-moving objects.

A box's wireframe appears in the viewport with three orange dots. You can click and drag these to edit the shape's extents interactively. We can also precisely set the size in the inspector. Click on the BoxShape3D to expand the resource. Set its Size to 60 on the X-axis, 2 for the Y-axis, and 60 for the Z-axis.

Collision shapes are invisible. We need to add a visual floor that goes along with it. Select the Ground node and add a MeshInstance3D as its child.

In the Inspector, click on the field next to Mesh and create a BoxMesh resource to create a visible box.

Once again, it's too small by default. Click the box icon to expand the resource and set its Size to 60, 2, and 60.

You should see a wide grey slab that covers the grid and blue and red axes in the viewport.

We're going to move the ground down so we can see the floor grid. To do this, the grid snapping feature can be used. Grid snapping can be activated 2 ways in the 3D editor. The first is by pressing the Use Snap button (or pressing the Y key). The second is by selecting a node, dragging a handle on the gizmo then holding Ctrl while still clicking to enable snapping as long as Ctrl is held.

Start by setting snapping with your preferred method. Then move the Ground node using the Y-axis (the green arrow on the gizmo).

INFO

If you can't see the 3D object manipulator like on the image above, ensure the Select Mode is active in the toolbar above the view.

Move the ground down 1 meter, in order to have a visible editor grid. A label in the bottom-left corner of the viewport tells you how much you're translating the node.

INFO

Moving the Ground node down moves both children along with it. Ensure you move the Ground node, not the MeshInstance3D or the CollisionShape3D.

Ultimately, Ground's transform.position.y should be -1

Let's add a directional light so our scene isn't all grey. Select the Main node and add a child node DirectionalLight3D.

We need to move and rotate the DirectionalLight3D node. Move it up by clicking and dragging on the manipulator's green arrow and click and drag on the red arc to rotate it around the X-axis, until the ground is lit.

In the Inspector, turn on Shadow -> Enabled by clicking the checkbox.

At this point, your project should look like this.

That's our starting point. In the next part, we will work on the player scene and base movement.