Game Dev Journey

Create a new scene with Node3D as the root and rename this to Turret

Add a MeshInstance3D as a child and rename this to TurretBase

Choose a new CylinderMesh for the TurretBase

Set height to 1 meter

Set y position to 0.5

Add a MeshInstance3D as a child of TurretBase and rename it to TurretTop

In the Mesh property add a new CyclinderMesh

and adjust the properties as shown

Add a MeshInstance3D as a child of TurretTop and rename it to Visor

In the Mesh property add a new BoxMesh

and adjust the properties as shown

Add a MeshInstance3D as a child of Visor and rename it to Barrel

In the Mesh property add a new BoxMesh

and adjust the properties as shown

To be able to add turrets to the level

add a new Node3D as a child of the BaseLevel scene

Call it TurretManager

Attach a script to it

In the TurretManager script

Add an export variable for a packed scene

In the Inspector load the turret scene

In the TurretManager script

Create a function to

build turrets

Line 5:

This defines a function named build_turret.

It takes one parameter: turret_position, which is a 3D coordinate (a Vector3).

-> void means the function doesn’t return anything.

Line 6:

This creates a new copy (instance) of a turret using a preloaded scene or resource called turret.

instantiate() is how Godot creates a new object from a saved scene (usually a .tscn file).

Line 7:

This adds the new turret to the current scene tree as a child of the node that called build_turret.

This makes the turret appear in the game and be part of the active scene.

Line 8:

This sets the global position of the turret to the location provided by turret_position.

It ensures the turret appears exactly where you want it in the 3D world.

Placing turrets with the mouse

Return to the ray_picker_camera script

add an export variable for the turret manager

In the BaseLevel scene

Select the RayPickerCamera node

Assign the TurretManager node

In the Inspector

In the ray_picker_camera script

add a variable to store the position of the tile

call the build_turret function of the turret_manager

Line 23: var tile_position = gridmap.map_to_local(cell)

Converts the grid cell back into world-space coordinates (for placing the turret).

Line 24: turret_manager.build_turret(tile_position)

Calls the build_turret() function in the turret_manager to place a turret at that position.

Test the game, you can click and place turrets on the spaces around the path

Previous: Mouse Input

Turrets

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