Depth

获取Depth的几种方法，分别有不同效果

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没有显示，不知道是代码有问题还是unity有问题，unity4与5都试了，都没有值。

CameraDepthNormalsTexture  可以获取Normals和Depth

Normal

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

                                      ---- by wolf96 http://blog.csdn.net/wolf96