Unity Voxel Terrain basic blended shader. https://youtu.be/btOs50kk9IA

VoxelShader.shader

// Developed as part of World of Zero: www.worldofzero.com

Shader "Custom/VoxelShader" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_Texture1("Texture 1 (RGB)", 2D) = "white" {}
		_Texture2("Texture 2 (RGB)", 2D) = "white" {}
		_Texture3("Texture 3 (RGB)", 2D) = "white" {}
		_Texture1Height("Texture 1 Height (R)", 2D) = "black" {}
		_Texture2Height("Texture 2 Height (R)", 2D) = "black" {}
		_Texture3Height("Texture 3 Height (R)", 2D) = "black" {}
		_Texture1Normal("Texture 1 Normal (RGB)", 2D) = "black" {}
		_Texture2Normal("Texture 2 Normal (RGB)", 2D) = "black" {}
		_Texture3Normal("Texture 3 Normal (RGB)", 2D) = "black" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
		_Scale ("Scale", Float) = 4
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard fullforwardshadows

		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0

		sampler2D _Texture1;
		sampler2D _Texture2;
		sampler2D _Texture3;
		sampler2D _Texture1Height;
		sampler2D _Texture2Height;
		sampler2D _Texture3Height;
		sampler2D _Texture1Normal;
		sampler2D _Texture2Normal;
		sampler2D _Texture3Normal;

		struct Input {
			float2 uv_Texture1;
			float3 color : COLOR;
		};

		half _Glossiness;
		half _Metallic;
		fixed4 _Color;
		half _Scale;

		// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
		// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
		// #pragma instancing_options assumeuniformscaling
		UNITY_INSTANCING_CBUFFER_START(Props)
			// put more per-instance properties here
		UNITY_INSTANCING_CBUFFER_END

		void surf (Input IN, inout SurfaceOutputStandard o) {
			fixed height1 = tex2D(_Texture1Height, IN.uv_Texture1).r;
			fixed height2 = tex2D(_Texture2Height, IN.uv_Texture1).r;
			fixed height3 = tex2D(_Texture3Height, IN.uv_Texture1).r;

			float3 color = float3(IN.color.r + height1, IN.color.g + height2, IN.color.b + height3);

			// Albedo comes from a texture tinted by color
			fixed4 tex1 = tex2D(_Texture1, IN.uv_Texture1) * _Color;
			fixed4 tex2 = tex2D(_Texture2, IN.uv_Texture1) * _Color;
			fixed4 tex3 = tex2D(_Texture3, IN.uv_Texture1) * _Color;

			fixed3 normal1 = UnpackNormal(tex2D(_Texture1Normal, IN.uv_Texture1));
			fixed3 normal2 = UnpackNormal(tex2D(_Texture2Normal, IN.uv_Texture1));
			fixed3 normal3 = UnpackNormal(tex2D(_Texture3Normal, IN.uv_Texture1));

			float t1 = (1 / (1 * pow(2, color.r * _Scale)) + 1) / 2;
			float t2 = (1 / (1 * pow(2, color.g * _Scale)) + 1) / 2;
			float t3 = (1 / (1 * pow(2, color.b * _Scale)) + 1) / 2;

			float tSum = t1 + t2 + t3;
			t1 /= tSum;
			t2 /= tSum;
			t3 /= tSum;

			tex1 *= t1;
			tex2 *= t2;
			tex3 *= t3;

			o.Albedo = (tex1 + tex2 + tex3);

			// Metallic and smoothness come from slider variables
			o.Normal = (normal1 * t1 + normal2 * t2 + normal3 * t3);
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Occlusion = 1;
			o.Alpha = 1;
		}
		ENDCG
	}
	FallBack "Diffuse"
}