Updating the physics settings

In the previous chapter, we included all the variations of enemies in the project and created a couple of scripts to spawn and update them. Now, we are going to expand enemy support by adding a custom layer for them and setting up the layer collision matrix and camera’s Culling Mask to use the new layer.

Let's start by creating the new layer:

1. Click Edit | Project Settings….
2. In the Project Settings window, select the Tags and Layers option from the left panel.
3. Add the Enemy value to User Layer 9.
4. Save the project.

The following figure shows the current custom layers that we have added so far to our project:

Figure 10.1 – Adding Enemy to the Layers settings

It is important that the Portrait, Unit, Plane, and Enemy custom layers are added to the corresponding User Layer. When setting a layer to a Culling Mask, for example, the Unity Engine uses User Layer as an index, and...