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Question by compuguru992000 · Jan 19, 2019 at 05:19 AM · lightingtexture2drendertexturecodepagecookie

RenderTexture to Spotlight Cookie

I have been trying to get a render texture to work in a spotlight as a cookie, the camera going to the render texture has clear solid color with alpha 0 so only objects in camera(particle system) are shown in the texture preview panel. code below that is not working.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class TextureToSpotlightTest : MonoBehaviour {
 
     public RenderTexture rText;
     public Light light;
     Texture2D texture;
     // Use this for initialization
     void Start ()
     {
         StartCoroutine(Picture());    
     }
 
     IEnumerator Picture()
     {
         while (true)
         {
             yield return new WaitForEndOfFrame();
             Texture2D myTexture = toTexture2D(rText);
             light.cookie = myTexture;
         }
     }
 
     Texture2D toTexture2D(RenderTexture rTex)
     {
         Texture2D tex = new Texture2D(rTex.width, rTex.height, TextureFormat.RGBA32, false);
         RenderTexture.active = rTex;
         tex.ReadPixels(new Rect(0, 0, rTex.width, rTex.height), 0, 0);
         tex.Apply();
         tex.alphaIsTransparency = true;
         
         tex.wrapMode = TextureWrapMode.Clamp;
         return tex;
     }
 }
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