95-Shader__DepthTexture Shader-NewUnlitShader.shader.txt

Shader "Unlit/#NAME#"
{
//This grabs from a depth shader, similar to how the Grab Pass shader works.
//It will be transparent, based on the distance to an opaque surface behind it
// This will require that the camera is rendering to a depth texture, which might require this script:
//  camera.depthTextureMode = DepthTextureMode.DepthNormals;
	Properties
	{
		_Color("Color", Color) = (0,0,0,0)
		_DepthStrength("Depth Strength", float) = 1
	}

	SubShader
	{
		Blend SrcAlpha OneMinusSrcAlpha
		ZWrite On
		Cull Back

		Tags
		{
			"RenderType" = "Transparent"
			"Queue" = "Geometry+1"
		}

		Pass
		{
			CGPROGRAM
			#pragma target 3.0
			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 projPos : TEXCOORD1; //Screen position of pos
				float4 vertex : SV_POSITION;
				float depth : DEPTH;
			};

			float _DepthStrength;

			sampler2D _CameraDepthNormalsTexture;
			fixed4 _Color;

			v2f vert(appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.projPos = ComputeScreenPos(o.vertex);
				o.depth = -mul(UNITY_MATRIX_MV, v.vertex).z *_ProjectionParams.w;
				return o;
			}
	
			fixed4 frag(v2f i) : SV_Target
			{
				float screenDepth = DecodeFloatRG(tex2D(_CameraDepthNormalsTexture, i.projPos.xy / i.projPos.w).zw);
				float diff = (screenDepth - i.depth) * 0.3;
				float intersect = 1 - smoothstep(0, _ProjectionParams.w * _DepthStrength, diff);
				float glow = 1-intersect;

				return fixed4(_Color.rgb, glow);
		}
			ENDCG
		}
	}
}