Unity Game Development Functions Tutorial

This tutorial provides helpful functions for Unity game development, including moving objects smoothly, finding the closest enemy, and creating new game elements based on user input. Learn how to implement these functions in your Unity projects to enhance gameplay and user experience.

• Unity
• Game Development
• Functions
• Tutorial
• GameObject

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1. Unity 03

2. script Lab 02 http://www.image.ece.ntua.gr/courses_static/cg/

3. Tags: tower Name: bottomleft, bottomright

4. function MoveObject (thisTransform : Transform, startPos : Vector3, endPos : Vector3, time : float) { var i = 0.0; var rate = 1.0/time; while (i < 1.0) { i += Time.deltaTime * rate; thisTransform.position = Vector3.Lerp(startPos, endPos, i); yield; } }

5. if(Input.GetMouseButtonDown(0)) { ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray, hit, 100)) { if (hit.collider.name=="Plane") newHero = Instantiate(hero1, hit.point + Vector3(0, 1, 0), Quaternion.identity); } newHero.name = "Hero"+nextNameNumber; objectToMove = GameObject.Find("Hero"+nextNameNumber); Debug.Log ("New object name: "+ objectToMove.name); target = GameObject.Find("bottomleft"); nextNameNumber++; hero1.transform.position = Vector3.MoveTowards(transform.position, target.gameObject.transform.position, 10); //MoveObject (objectToMove.transform, objectToMove.transform.position, target.gameObject.transform.position, 1); }

6. function FindClosestEnemy (whichObject : GameObject) : GameObject { // Find all game objects with tag Tower var gos : GameObject[]; gos = GameObject.FindGameObjectsWithTag("tower"); var closest : GameObject; var distance = Mathf.Infinity; var position = transform.position; // Iterate through them and find the closest one for (var go : GameObject in gos) { var diff = (go.transform.position - whichObject.transform.position); var curDistance = diff.sqrMagnitude; if (curDistance < distance) { closest = go; distance = curDistance; } } return closest; }

7. if(Input.GetMouseButtonDown(0)) { ray = Camera.main.ScreenPointToRay(Input.mousePosition); if (Physics.Raycast(ray, hit, 100)) { if (hit.collider.name=="Plane") newHero = Instantiate(hero1, hit.point + Vector3(0, 1, 0), Quaternion.identity); } newHero.name = "Hero"+nextNameNumber; objectToMove = GameObject.Find("Hero"+nextNameNumber); //target = GameObject.Find("bottomleft"); enemy = FindClosestEnemy(objectToMove); Debug.Log (enemy.name); Debug.Log ("object " + objectToMove.name + " will move to " + enemy.name); nextNameNumber++; //hero1.transform.position = Vector3.MoveTowards(transform.position, target.gameObject.transform.position, 10); MoveObject (objectToMove.transform, objectToMove.transform.position, enemy.transform.position, 1); }

8. Final declarations var hero1 : GameObject; var ray: Ray; var hit: RaycastHit; var gridSpacing = 1.0; var target: GameObject; var newHero : GameObject; var objectToMove : GameObject; var nextNameNumber = 0; var enemy : GameObject;