Revealing under light - chnge light angle?

Questions & Answers
1

I am using this method and included script for hidden object revealing by a spot light using this script and shader: How to reveal Objects Under Light In Unity 3D - YouTube

Objects are revealed under light. I would like to change the script or revealing shader to manage that the objects will be revealed only by an oblique light (not direct, but light from the side). Can you help me with this?

The script and the shader from the video are here:

//Shady
using UnityEngine;

[ExecuteInEditMode]
public class Reveal : MonoBehaviour
{
    [SerializeField] Material Mat;
    [SerializeField] Light SpotLight;
	
	void Update ()
    {
        Mat.SetVector("MyLightPosition",  SpotLight.transform.position);
        Mat.SetVector("MyLightDirection", -SpotLight.transform.forward );
        Mat.SetFloat ("MyLightAngle", SpotLight.spotAngle         );
    }//Update() end
}//class end

and

//Shady
Shader "Revealing Under Light"
{
	Properties
	{
		MyColor("Color", Color) = (1,1,1,1)
		MyMainTex("Albedo (RGB)", 2D) = "white" {}
		MyGlossiness("Smoothness", Range(0,1)) = 0.5
		MyMetallic("Metallic", Range(0,1)) = 0.0
		MyLightDirection("Light Direction", Vector) = (0,0,1,0)
		MyLightPosition("Light Position", Vector) = (0,0,0,0)
		MyLightAngle("Light Angle", Range(0,180)) = 45
		MyStrengthScalor("Strength", Float) = 50
	}//Properties end
	SubShader
	{
		Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }
		Blend SrcAlpha OneMinusSrcAlpha
		LOD 200
		CGPROGRAM
#pragma surface SurfaceReveal Standard fullforwardshadows alpha:fade
#pragma target 3.0
		sampler2D MyMainTex;

		struct Input
		{
			float2 UVMainTex;
			float3 worldPos;
		};//Struct end

		half   MyGlossiness;
		half   MyMetallic;
		fixed4 MyColor;
		float4 MyLightPosition;
		float4 MyLightDirection;
		float  MyLightAngle;
		float  MyStrengthScalor;

		void SurfaceReveal(Input input, inout SurfaceOutputStandard R)
		{ 
			float3 Dir      = normalize(MyLightPosition - input.worldPos);
			float  Scale    = dot(Dir, MyLightDirection);
			float  Strength = Scale - cos(MyLightAngle * (3.14 / 360.0));
			Strength        = min(max(Strength * MyStrengthScalor, 0), 1);
			fixed4 RC       = tex2D(MyMainTex, input.UVMainTex) * MyColor;
			R.Albedo        = RC.rgb;
			R.Emission      = RC.rgb * RC.a * Strength;
			R.Metallic      = MyMetallic;
			R.Smoothness    = MyGlossiness;
			R.Alpha         = Strength * RC.a;
		}//SurfaceReveal end
	ENDCG
	}//SubShader end
		FallBack "Diffuse"
}//Shader end
2

Help still needed. Thanks