How to make the screen temporarily go black?

Questions & Answers
1

I’m writing a program that is used for attention and perception research, in which a ball starts at a random z coordinate and moves toward the camera. The participant is meant to press the space bar when they think the ball would “hit them”, or reach the camera. I want the screen to go black after a certain amount of time so it reads the participants perception of the speed of the object. I want this to happen anywhere from 1-3 seconds after the program starts. I have code written that restarts the scene after a certain amount of time, so the black screen only needs to occur once. I am new to coding and have no idea how to do this. Can someone help me? Or at least lead me to the documentation necessary?

2

You can add Panel in Canvas. Name the panel as “BlackScreen”. and in your start method write something like this.

//add
using UnityEngine.UI;

void Start(){
// set color of the panel transparent
GameObject.Find("Canvas/BlackScreen").GetComponent<Image>().color = new Color(0,0,0,0);

//call GoBlack function after random 1-3 seconds 
Invoke("GoBlack",Random.Range(1,3));
}

void GoBlack()
{
// set color of the panel - black
GameObject.Find("Canvas/BlackScreen").GetComponent<Image>().color = new Color(0,0,0,255);
}