Food
Lesson 5 of 14 in Coddy's Unity Game: Snake 3D course.
Food lies on a random cell. Cells are whole numbers, so pick x and z with the int version of Random.Range. With ints the maximum is left out: Random.Range(1, 7) rolls a die, 1 to 6, never 7. To include a number, ask for one more than it.
With float arguments Random.Range returns any number in between, such as 3.62, which is not the middle of a cell, so the snake would never meet the food. A chest on a 10 by 10 grid with cells 0 to 9:
int row = Random.Range(0, 10); // 0 to 9
int column = Random.Range(0, 10);
chest.position = new Vector3(column, 0f, row);The board holds one food at a time, so the game makes it once, in Start(), and moves it whenever it needs a new place. GameManager owns the food, and it reads the board's size from the snake's edge through a snake field.
Challenge
MediumFill in GameManager. The scene sets its snake to the head's Snake and its foodPrefab to a red sphere.
- Add
public Snake snake;,public GameObject foodPrefab;andprivate Transform food;. - In
Start(), instantiatefoodPrefab, keep its Transform infood, and callMoveFood(). - Write
void MoveFood(): it putsfoodon a random cell, x and z each from-snake.edgetosnake.edge, and y 0.
Press Play and find the food on the board, then press Check.
Try it yourself
using UnityEngine;
public class GameManager : MonoBehaviour
{
// Runs the game: the food, the score and the game over. Chapter 2 fills it in.
}
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
