3D Real-Time-Strategy (RTS) Game Tutorial - Unity3D _ Coffee Break Codes

12/06/2015 3DRealTimeStrategy(RTS)GameTutorialUnity3D|CoffeeBreakCodes

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3D Real-Time-Strategy (RTS) Game Tutorial Unity3D

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3D Real-Time-Strategy (RTS) Game Tutorial Unity3D (C#).

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Part I: Building Placement

In this tutorial series, we will develop the RTS basics such as building placement, camera controls, unit controls, creating units etc. Lets startwith Building placement.

As you know from legends of RTSgames, some different buildings can be built.

Open Unity and create a new 3D project. Most of RTS games have a top camera. So, create a terrain, create a directional light and change cameraposition for looking downward. You can add grass texture to terrain if you want. Also, you can use some building objects or just cubes for now. Iuseda street package named Cartoon City by Razu Ahmed (http://bit.ly/1cmYnX2 ) that you can find out lots of objects. Add 2 buildings to thescene and create 2 empty game objects as their parents. For each parent, add Collider and Rigidbody. Create prefabs and delete objects in scene.

First of all, we need a Building class which includes health, game object and name. Create a C# script named Building.

Add Generic library because we are going to use list type.

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public class Buildings{ public int health; public string name; public GameObject avatar; public Buildings(int _health, string _name, GameObject _avatar){ health = _health; name = _name; avatar = _avatar; } }

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Now, create a list for game objects and a list for Building class objects.

We are going to add 3D building objects manually. Create buildings according to these objects.

Thats it. Our building class is ready. Now, create 3 C# scripts to check availability, place buildings and create GUI: Available, Placement,Manager. Open Manager script.

This script gets names from Building class and creates buttons.

Open Available script.Add generic library for using lists.

Collider list keeps count of colliding that provides if it is available to place a building. Count increase if the new building collides any object thathas Building tag and count decrease if the new building exits from the collision. Now open Placement script.

1 using System.Collections.Generic;

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public List buildingList = new List (); public Buildings newBuilding; public GameObject[] buildings;

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void Start(){ for (int i = 0; i < buildings.Length; i ++) { newBuilding = new Buildings (100, buildings[i].name, buildings[i] ); buildingList.Add(newBuilding); } }

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private Building buildingClass; private bool isClickable; void Start () { buildingClass = GetComponent (); isClickable = true; } public void SetClickable(bool w){ isClickable = w; } void OnGUI(){ for (int i = 0; i < buildingClass.buildings.Length; i ++) { if (GUI.Button(new Rect(50 * 2 * i, 100 , 75, 30), buildingClass.buildings[i].name) && isClickable){ isClickable = false; } } }

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public List colliders = new List (); private bool isSelected; private Building buildingClass; void Start () { buildingClass = GetComponent (); } void OnTriggerEnter(Collider c){ if (c.tag == "Building") { colliders.Add(c); } } void OnTriggerExit(Collider c){ if (c.tag == "Building") { colliders.Remove(c); } } public void SetSelected(bool b){ isSelected = b; } void OnGUI(){ if (isSelected) { GUI.Button(new Rect(100, 200, 100, 50), name); } }

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public LayerMask bMask; private Transform currentBuilding; private Available available; private bool isPlaced; private Available availableX; private Building newBuilding; private Manager clickable; void Update () { Vector3 mPos = Input.mousePosition;



In this section, we assign the building position when it is instantiated by clicking the button via SetItem() function. Also, we get the functionwhen clicking on a building with ray. It is just like an invisible laser from camera to the downward. It returns something if it hits any object.IsAvailable() checks if the new building collides anything. Open Manager script and edit it as seen below.

Now, attach Manager, Placement and Building to Main Camera and attach Available to each prefab. Do not forget to assign your prefabs. Alsoyou can add grid to your buildings. Create a Grid script and attach it to each prefab. For more information about Grid function, see Grid Tutorial.

You can download the source code here.

Coffee Break Codes 3D Real Time Strategy Game Tutorial Unity3D (C#)

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mPos = new Vector3 (mPos.x, mPos.y, transform.position.y); Vector3 pos = camera.ScreenToWorldPoint (mPos); if (currentBuilding != null && !isPlaced) { currentBuilding.position = new Vector3 (pos.x, 0, pos.z); if (Input.GetMouseButtonDown (0)) { if (IsAvailable ()) { isPlaced = true; clickable = gameObject.GetComponent (); clickable.SetClickable(true); } } } else { if (Input.GetMouseButtonDown(0)){ RaycastHit hit = new RaycastHit(); Ray ray = new Ray(new Vector3(pos.x, 10, pos.z), Vector3.down); if (Physics.Raycast(ray, out hit, Mathf.Infinity, bMask)){ if(availableX != null){ availableX.SetSelected(false); } hit.collider.gameObject.GetComponent ().SetSelected(true); availableX = hit.collider.gameObject.GetComponent (); } else{ if(availableX != null){ availableX.SetSelected(false); } } } } } public void SetItem(GameObject g){ isPlaced = false; currentBuilding = ((GameObject)Instantiate(g)).transform; available = currentBuilding.GetComponent (); } bool IsAvailable(){ if (available.colliders.Count > 0) { return false; } return true; }

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private Building buildingClass; private Placement placement; private bool isClickable; void Start () { placement = GetComponent (); buildingClass = GetComponent (); isClickable = true; } public void SetClickable(bool w){ isClickable = w; } void OnGUI(){ for (int i = 0; i < buildingClass.buildings.Length; i ++) { if (GUI.Button(new Rect(50 * 2 * i, 100 , 75, 30), buildingClass.buildings[i].name) && isClickable){ isClickable = false; placement.SetItem(buildingClass.buildings[i]); } } }



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2 thoughts on 3D Real-Time-Strategy (RTS) Game Tutorial Unity3DReply AliquidHacker

June 8, 2015 at 12:24 pmAny hope for part 2?

Reply Mocha Post authorJune 8, 2015 at 1:50 pmWill be:)

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3D Real-Time-Strategy (RTS) Game Tutorial - Unity3D _ Coffee Break Codes

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