Returning Float World Coordinates using Shaders

Hello, I'm new to shaders but not with Unity.
What I'm trying to do is to get the world positions of each pixel using shaders...
Then I am returning the result from a shader in an ARGBFloat RenderTexture and copy the values to an array.

I think it is quite working, but even when I use a texture in float format it clamps the results of the fragment shader in [0,1] format. I came through similar threads and I did find any answer.

Here is my shader code:

Code (CSharp):

1. //Shows the grayscale of the depth from the camera.
2.  
3. Shader "Custom/DepthShader"
4. {
5.     SubShader
6.     {
7.  
8.         Pass
9.     {
10.         ZTest Always  ZWrite On
11.         Fog{ Mode off }
12.  
13.         CGPROGRAM
14. #pragma target 3.0
15. #pragma vertex vert
16. #pragma fragment frag
17. #include "UnityCG.cginc"
18.  
19.     //uniform sampler2D _CameraDepthTexture; //the depth texture
20.  
21.     struct v2f
22.     {
23.         float4 pos : SV_POSITION;
24.         float4 projPos : TEXCOORD0; //Screen position of pos
25.         float4 wPos : TEXCOORD1;
26.     };
27.  
28.     v2f vert(appdata_base v)
29.     {
30.         v2f o;
31.         o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
32.         o.projPos = ComputeScreenPos(o.pos);
33.         o.wPos = mul(unity_ObjectToWorld, v.vertex);
34.  
35.         return o;
36.     }
37.  
38.    
39.  
40.     float4 frag(v2f i) : COLOR
41.     {
42.         float4 c;
43.         float x = i.pos.x;
44.         float y = i.pos.y;
45.         float z = i.pos.z;
46.        
47.         float w = 1;
48.  
49.         return float4(x,y,z,1);
50.     }
51.  
52.         ENDCG
53.     }
54.     }
55. }

And the code that I am using attached to the camera :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class DepthGrayScale2 : MonoBehaviour
6. {
7.  
8.     Vector3[] positions;
9.     public float[] radiuses;
10.     public float[] intensities;
11.     public float[] array;
12.  
13.     public float[,] texture;
14.  
15.     public RenderTexture rTex;
16.  
17.     public Material mat;
18.     //    public Material _kernelMaterial;
19.     public int M;
20.     public int N;
21.     public Shader shader;
22.     Camera mCamera;
23.     // Use this for initialization
24.     void Start()
25.     {
26.         rTex = CreateBuffer();
27.         mat = CreateMaterial(shader);
28.         mCamera = this.GetComponent<Camera>();
29.         mCamera.SetReplacementShader(shader, "");
30.         mCamera.targetTexture = rTex;
31.         mCamera.depthTextureMode = DepthTextureMode.Depth;
32.     }
33.  
34.     float[] DecodeFloatTexture()
35.     {
36.         Texture2D decTex = new Texture2D(rTex.width, rTex.height, TextureFormat.RGBAFloat, false);
37.         RenderTexture.active = rTex;
38.         decTex.ReadPixels(new Rect(0, 0, rTex.width, rTex.height), 0, 0);
39.         decTex.Apply();
40.         RenderTexture.active = null;
41.         Color[] colors = decTex.GetPixels();
42.        
43.         float[] results = new float[colors.Length * 4];
44.         Vector4 point = new Vector4();
45.         for (int i = 0; i < colors.Length; i++)
46.         {
47.             results[i * 4] = colors[i].r;
48.             results[i * 4 + 1] = colors[i].g;
49.             results[i * 4 + 2] = colors[i].b;
50.             results[i * 4 + 3] = colors[i].a;
51.             point = new Vector4(colors[i].r, colors[i].g, colors[i].b, colors[i].a);
52.         }
53.         return results;
54.     }
55.  
56.     float[] DecodeFloatTexture(RenderTexture tex)
57.     {
58.         Texture2D decTex = new Texture2D(tex.width, tex.height, TextureFormat.RGBAFloat, false);
59.         RenderTexture.active = tex;
60.         decTex.ReadPixels(new Rect(0, 0, tex.width, tex.height), 0, 0);
61.         decTex.Apply();
62.         RenderTexture.active = null;
63.         Color[] colors = decTex.GetPixels();
64.        
65.         float[] results = new float[colors.Length * 4];
66.         Vector4 point = new Vector4();
67.         for (int i = 0; i < colors.Length; i++)
68.         {
69.             results[i * 4] = colors[i].r;
70.             results[i * 4 + 1] = colors[i].g;
71.             results[i * 4 + 2] = colors[i].b;
72.             results[i * 4 + 3] = colors[i].a;
73.             point = new Vector4(colors[i].r, colors[i].g, colors[i].b, colors[i].a);
74.         }
75.         return results;
76.     }
77.  
78.     // Update is called once per frame
79.     void OnRenderImage(RenderTexture source, RenderTexture destination)
80.     {
81.         Graphics.Blit(source, destination);
82.         GameObject obj = GameObject.Find("SQUARE");
83.         obj.GetComponent<Renderer>().material.mainTexture = mCamera.targetTexture;
84.         array = DecodeFloatTexture(mCamera.targetTexture);
85.  
86.         float max = 0;
87.         float min = -10;
88.         for (int i = 0; i < array.Length; i++)
89.         {
90.             if (max > array[i])
91.                 max = array[i];
92.             if (min <= array[i] && array[i] != 0)
93.                 min = array[i];
94.         }
95.  
96.         Debug.Log("max = " + max + " min =" + min);
97.     }
98.  
99.  
100.  
101.  
102.  
103.  
104.     RenderTexture CreateBuffer()
105.     {
106.         var buffer = new RenderTexture(M, N, 0, RenderTextureFormat.ARGBFloat);
107.         buffer.hideFlags = HideFlags.DontSave;
108.         buffer.filterMode = FilterMode.Point;
109.         buffer.wrapMode = TextureWrapMode.Repeat;
110.      
111.         return buffer;
112.     }
113.  
114.     Material CreateMaterial(Shader shader)
115.     {
116.         var material = new Material(shader);
117.         material.hideFlags = HideFlags.DontSave;
118.         return material;
119.     }
120. }
121.  

Anyone has any idea of how to return the "full" float coordinates to the rendertexture ? Any helpThanks for the help