Begin by  adding a new Area3D node to the Scene

rename it to Enemy

Area3D

Area3D is a different kind of node to the StaticBody that we use on our platforms. 

It doesn’t act as a physical object and can be used on moving objects. 

They are ideal for use as triggers.

We use Area3Ds to detect colliders within an area without blocking them.

This makes Area3Ds perfect for enemies, collectibles, or anything else you

want the player to be able to walk through while triggering an event.

Drag the spikeBlock.obj into the scene

Now make it a child of Enemy

Rename it to Model

Add CollisionShape3D Node

Choose BoxShape3D

Resize it to fit the model

Right-click on Enemy Node and Save Branch as Scene

Now add enemies to the map. A good spot is between two platforms.