Draw 3D GameObject above GUI in Unity

Question

I would like to draw a GameObject in front of all other components in my project and GUI Textures as well.

I created a second Camera and set Depth and Layer but it still not work. I hope you can help me to find the error or something I forgot.

Here is my MainScript which is drawing a simple Texture:

using UnityEngine;
using System.Collections;

public class MainScript : MonoBehaviour
{
Texture2D texture;

// Use this for initialization
void Start()
{
    texture = new Texture2D(Screen.width, Screen.height);

    for (int y = 0; y < texture.height; y++)
    {
        for (int x = 0; x < texture.width; x++)
        {
            texture.SetPixel(x, y, Color.blue);
        }
    }
    texture.Apply();
}

void OnGUI()
{
    GUI.DrawTexture(new Rect(0, 0, texture.width, texture.height), texture);
}
}

I also created two cameras and a GameObject which displays a GUI Texture. The Texture is visible in the preview screen but on runtime the Texture which is drawing in the MainScript is foregrounded.

I made two more Screenshots of my Camera Objects. See here:

I can also supply the whole project for you. It is just a basic test project.

Here is the link to the Project in Google Drive: Download

Answer 1

set depth of camera2 to camera1.depth+1, Clear Flags of camera2 to depth only and Clear Flags of camera1 to skybox. Uncheck GUILayer at Camera2 and check GUILayer in camera1. That should do it...

Answer 2

You cannot draw 3D objects in front of the GUI elements, OnGUI code always renders in top of everything.

To achieve this you can use Render Textures (Unity Pro only): have two cameras in your scene, place your 3D objects in one camera, render this camera to a texture, and finally use that texture as the source of a GUI.DrawTexture() .