Camera.Render problem

Questions & Answers
1

I’ve been trying for ages but I can’t seem to get Camera.Render() to work.
All I get is a completely grey texture :(((
RGBA(0.804, 0.804, 0.804, 0.804)

So the setup is super simple, I have a second camera (disabled as it is suggested in the documentation)
which looks at a sphere and has a render texture assigned. There is a plane which should now get the
rendered image as a texture.

The script is the following:

using UnityEngine;
using System.Collections;

public class RenderTest : MonoBehaviour {

	public Camera textureRenderCamera;
	public GameObject plane;

	public Texture2D CreateTexture() {

		RenderTexture currentRT = RenderTexture.active;
		RenderTexture.active = textureRenderCamera.targetTexture;
		Debug.Log("Rendertexture: "+ textureRenderCamera.targetTexture);
		Debug.Log("width/height:" + textureRenderCamera.targetTexture.width + " " + textureRenderCamera.targetTexture.height);

		textureRenderCamera.Render();

		Texture2D image = new Texture2D(textureRenderCamera.targetTexture.width, textureRenderCamera.targetTexture.height);
		image.ReadPixels(new Rect(0, 0, textureRenderCamera.targetTexture.width, textureRenderCamera.targetTexture.height), 0, 0);
		
		//for (int i=0;i<textureRenderCamera.targetTexture.width;i++)
		//	for (int j=0; j<textureRenderCamera.targetTexture.height; j++)
		//		image.SetPixel(i,j, Color.green);
		
		//image.Apply(true);

		Debug.Log (image.GetPixel(128,128));
		
		RenderTexture.active = currentRT;
		
		return image;
	}

	public void UpdateTexture()
	{
		Texture2D tex = CreateTexture();
		plane.renderer.material.mainTexture = tex;


	}

	// Update is called once per frame
	void Update () {
		if(Input.anyKey)
		{
			UpdateTexture();
		}
	
	}
}

If I assign the render texture to my plane again manually, it works fine.
If I set all the pixels to green in the script it also works (I feared the texture data might be getting lost somewhere…)

Maybe it’s a silly mistake but I just can’t find it. I would at least suspect the texture to become the clear color … but all i get is perfect grey.

Any ideas? Please…help :slight_smile:

Thanks in advance,

seb

2

you need to set the property camera.targetTexture

3

I found the problem… the rendertexture was set to antialiasing in which case it just returns grey.
If I set it to off it just works fine. Now I’m not sure if this is a bug or expected behaviour…

Anyhow… life goes on finally :wink: