Hardcrash when using GetPixels

[scottstephan]

I have some pretty simple code- I get the pixels of a texture and then check to see how many of those pixels are clear. Here’s the issue: It hard freezes Unity whenever I run it.

Two Q’s:
1- Any idea why? The portion that freezes is the “checkTexture()” function
2- Is there a smarter way to be checking how many pixels are x color?

UPDATE- Its definitely the loop that’s crashing this. But why?

using UnityEngine;
using System.Collections;

public class scratchoffManager : MonoBehaviour {
	public GameObject front;
	public GameObject back;
	private Texture2D texture;
	
	private Color[] pixelHitBlock = new Color[400];
	private gameManager manager;
	
	private int curTexSize;
	private Color[] currentTex;
	private int clearCounter;
	void Start () {
		manager = GameObject.Find ("gameManager").GetComponent<gameManager>();
		
		for(int i = 0; i < pixelHitBlock.Length; i++){
			pixelHitBlock *= new Color(0f,0f,0f,0f);*

•  }*
  

• }*

• public void setTexture(Texture2D newTex){*

•  back.renderer.material.mainTexture = newTex; //setTexture*
  

•  Debug.Log("Set back tex?");*
  

•  texture = Instantiate(front.renderer.material.mainTexture) as Texture2D;  //clone the material*
  

front.renderer.material.mainTexture = texture; //set the material equal to the clone

_ curTexSize = texture.height * texture.width;_

•  currentTex = new Color[curTexSize];*
  

•  StartCoroutine("checkTimer");*
  

• }*

• public void adjustTexture(Vector2 texCo){ //always come in a s0,0*
  _ int x = Mathf.FloorToInt(texCo.x * texture.width);_
  _ int y = Mathf.FloorToInt(texCo.y * texture.height);_

•  Debug.Log("pixel hit at" + x + "," + y);*
  

•  texture.SetPixels(x,y,20,20,pixelHitBlock);*
  

•  texture.Apply();*
  

• }*

• private void checkTexture(){*

•  Debug.Log("Checking the texture");*
  

•  currentTex = texture.GetPixels(0,0,texture.width,texture.height);*
  

•  Debug.Log("Checking the texture 2");*
  

•  for(int i = 0; i < currentTex.Length; i++){*
  

_ if(currentTex == Color.clear){_
* clearCounter++;*
* Debug.Log(“Checking the texture” + i);*
* }*
* Debug.Log(“Clear counter:” + clearCounter);*
* clearCounter = 0;*
* }*
* }*

* IEnumerator checkTimer(){*
* yield return new WaitForSeconds(1.5f);*

* checkTexture();*
* StartCoroutine(“checkTimer”);*
* }*
}

[ArkaneX]

The freeze is caused by Debug.Log statements. Even if your texture is relatively small, let’s say 128x128, printing once for each pixel can easily take over 20 seconds.