Unity3d 獲取屏幕depth與normal

Depth

獲取Depth的幾種方法，分別有不同效果

1.

<span style="font-size:14px;">            float2 depth_uv = float2(i.uv_MainTex.x, 1-i.uv_MainTex.y);
            float d = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, depth_uv);</span>

2.

<span style="font-size:14px;">                float zx = SAMPLE_DEPTH_TEXTURE_LOD(_CameraDepthTexture, float4(depth_uv, 0, 0));
                zx = Linear01Depth(zx);</span>

3.

<span style="font-size:14px;">        v2f vert(appdata_full v) {
            v2f o;
            o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                        o.screen = ComputeScreenPos(o.pos);
                        COMPUTE_EYEDEPTH(o.screen.z);
            o.uv_MainTex = TRANSFORM_TEX(v.texcoord, _MainTex);
            return o;
        }</span>

<span style="font-size:14px;">            float d2 = SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.screen));
            d2 = LinearEyeDepth(d2);</span>

4.

<span style="font-size:14px;">            float3 normalValues;
            float depthValue;
            DecodeDepthNormal(tex2D(_CameraDepthNormalsTexture, i.screen.xy), depthValue, normalValues);</span>

CameraDepthNormalsTexture沒有顯示，不知道是代碼有問題還是unity有問題，unity4與5都試了，都沒有值。

CameraDepthNormalsTexture  可以獲取Normals和Depth

Normal

<span style="font-size:14px;">tex2D(_CameraNormalsTexture, i.uv_MainTex);</span>

                                      ---- by wolf96