Anti Aliasing for Depth Texture

I'm trying to render the depth texture of a camera and apply anti aliasing, but I can't seem to get it to anti-alias. I always end up with jagged aliased edges. My code is below, any ideas where I'm going wrong?

Thanks!
Brad

My Shader:

Code (CSharp):

1. Shader "Custom/DepthCameraShader"
2. {
3.     SubShader
4.     {
5.         Tags{ "RenderType" = "Opaque" }
6.  
7.         Pass
8.         {
9.             CGPROGRAM
10.             #pragma vertex vert
11.             #pragma fragment frag
12.             #include "UnityCG.cginc"
13.  
14.             sampler2D _CameraDepthTexture;
15.  
16.             struct v2f
17.             {
18.                 float4 pos : SV_POSITION;
19.                 float4 scrPos:TEXCOORD1;
20.             };
21.  
22.             //Vertex Shader
23.             v2f vert(appdata_base v)
24.             {
25.                 v2f o;
26.                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
27.                 o.scrPos = ComputeScreenPos(o.pos);
28.                 return o;
29.             }
30.  
31.             //Fragment Shader
32.             half4 frag(v2f i) : COLOR
33.             {
34.                 float depthValue = Linear01Depth(tex2Dproj(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos)).r);
35.                 half4 depth;
36.  
37.                 depth.r = depthValue;
38.                 depth.g = depthValue;
39.                 depth.b = depthValue;
40.                 depth.a = 1;
41.  
42.                 return depth;
43.             }
44.             ENDCG
45.         }
46.     }
47.         FallBack "Diffuse"
48. }

My Image Effect Script:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class DepthCameraEffect : MonoBehaviour
5. {
6.     public Material depthCameraMaterial;
7.     private Camera cameraComponent;
8.     private RenderTexture tempRenderTexture;
9.  
10.     void Start()
11.     {
12.         cameraComponent = GetComponent<Camera>();
13.         cameraComponent.depthTextureMode = DepthTextureMode.Depth;
14.     }
15.  
16.     void OnRenderImage(RenderTexture source, RenderTexture destination)
17.     {
18.         tempRenderTexture = RenderTexture.GetTemporary(source.width, source.height, 0);
19.         tempRenderTexture.antiAliasing = 8;
20.         Graphics.Blit(tempRenderTexture, destination, depthCameraMaterial);
21.         RenderTexture.ReleaseTemporary(tempRenderTexture);
22.     }
23. }

 

I am drawing it to the screen and would like the depth AA to match the color AA. I'm using the depth buffer for compositing in After Effects.

 

I'm new to image effects and shaders, can you provide some reference examples for how to do this? I'm guessing I need to set a camera render texture target somewhere along the way?

 

Take a look at some of the supplied image effects and how they work first, simple ones like vignette or color correction are a good place to start.

 

Here, @bgolus has implemented the depth texture AA in this project.
http://forum.unity3d.com/threads/fixing-screen-space-directional-shadows-and-anti-aliasing.379902/
Cheers

 

The depth texture is not anti-aliased in itself in my setup. Rather when the anti-aliased forward pass is done I test multiple points in the depth texture to find the pixel in the depth that's the closest match.

 

Thanks for the clarification,
I stopped reading your code where you tap, assuming it's for blur purposes, now I see it indeed does more.
To the op: Once you get the depth texture inside your shader, you can tap it to perform a blur.

 

we are using _CameraDepthTexture to determine alpha value in uberPost.shader(for example, eliminate camera backgrounds color), that's very convenient. and also we want the _CameraDepthTexture have handled by SMAA, the the final output have smooth edges.