AssetForge_billboard.shader

Shader "Unlit/Billboard"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
	}
	SubShader
	{
		Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" "DisableBatching" = "True" }

		ZWrite Off
		Lighting Off
		Blend SrcAlpha OneMinusSrcAlpha

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				UNITY_FOG_COORDS(1)
				float4 pos : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				
				o.pos = UnityObjectToClipPos(v.vertex);
				o.uv  = v.uv.xy;

				// Billboard mesh towards camera
				
				float3 vpos = mul((float3x3)unity_ObjectToWorld, v.vertex.xyz);
				float4 worldCoord = float4(unity_ObjectToWorld._m03, unity_ObjectToWorld._m13, unity_ObjectToWorld._m23, 1.0);
				float4 viewPos = mul(UNITY_MATRIX_V, worldCoord) + float4(vpos, 0);
				float4 outPos = mul(UNITY_MATRIX_P, viewPos);
				
				o.pos = outPos;

				//UNITY_TRANSFER_FOG(o, o.pos);
				return o;
			}
			
			fixed4 frag (v2f i) : SV_Target
			{
				// sample the texture
				fixed4 col = tex2D(_MainTex, i.uv);
				
				// apply fog
				UNITY_APPLY_FOG(i.fogCoord, col);
				return col;
			}
			ENDCG
		}
	}
}