Change Surface type and Blendmode of materials at runtime when using LWRP or HDRP

MaterialController.cs

using System;
using UnityEngine;
using UnityEngine.Rendering;

public class MaterialController : MonoBehaviour
{
    public enum BlendMode
    {
        Alpha,
        Premultiply,
        Additive,
        Multiply
    }

    public enum SurfaceType
    {
        Opaque,
        Transparent
    }


    public static void ChangeMaterialTransparency(Material targetMaterial, bool transparent)
    {
        if (transparent)
        {
            targetMaterial.SetFloat("_Surface", (float) SurfaceType.Transparent);
            targetMaterial.SetFloat("_Blend", (float) BlendMode.Alpha);
        }
        else
            targetMaterial.SetFloat("_Surface", (float) SurfaceType.Opaque);

        SetupMaterialBlendMode(targetMaterial);
    }

    private static void SetupMaterialBlendMode(Material material)
    {
        if (material == null)
            throw new ArgumentNullException("material");
        var alphaClip = material.GetFloat("_AlphaClip") == 1;
        if (alphaClip)
            material.EnableKeyword("_ALPHATEST_ON");
        else
            material.DisableKeyword("_ALPHATEST_ON");
        var surfaceType = (SurfaceType) material.GetFloat("_Surface");
        if (surfaceType == 0)
        {
            material.SetOverrideTag("RenderType", "");
            material.SetInt("_SrcBlend", (int) UnityEngine.Rendering.BlendMode.One);
            material.SetInt("_DstBlend", (int) UnityEngine.Rendering.BlendMode.Zero);
            material.SetInt("_ZWrite", 1);
            material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
            material.renderQueue = -1;
            material.SetShaderPassEnabled("ShadowCaster", true);
        }
        else
        {
            var blendMode = (BlendMode) material.GetFloat("_Blend");
            switch (blendMode)
            {
                case BlendMode.Alpha:
                    material.SetOverrideTag("RenderType", "Transparent");
                    material.SetInt("_SrcBlend", (int) UnityEngine.Rendering.BlendMode.SrcAlpha);
                    material.SetInt("_DstBlend", (int) UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                    material.SetInt("_ZWrite", 0);
                    material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                    material.renderQueue = (int) RenderQueue.Transparent;
                    material.SetShaderPassEnabled("ShadowCaster", false);
                    break;
                case BlendMode.Premultiply:
                    material.SetOverrideTag("RenderType", "Transparent");
                    material.SetInt("_SrcBlend", (int) UnityEngine.Rendering.BlendMode.One);
                    material.SetInt("_DstBlend", (int) UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
                    material.SetInt("_ZWrite", 0);
                    material.EnableKeyword("_ALPHAPREMULTIPLY_ON");
                    material.renderQueue = (int) RenderQueue.Transparent;
                    material.SetShaderPassEnabled("ShadowCaster", false);
                    break;
                case BlendMode.Additive:
                    material.SetOverrideTag("RenderType", "Transparent");
                    material.SetInt("_SrcBlend", (int) UnityEngine.Rendering.BlendMode.One);
                    material.SetInt("_DstBlend", (int) UnityEngine.Rendering.BlendMode.One);
                    material.SetInt("_ZWrite", 0);
                    material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                    material.renderQueue = (int) RenderQueue.Transparent;
                    material.SetShaderPassEnabled("ShadowCaster", false);
                    break;
                case BlendMode.Multiply:
                    material.SetOverrideTag("RenderType", "Transparent");
                    material.SetInt("_SrcBlend", (int) UnityEngine.Rendering.BlendMode.DstColor);
                    material.SetInt("_DstBlend", (int) UnityEngine.Rendering.BlendMode.Zero);
                    material.SetInt("_ZWrite", 0);
                    material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
                    material.renderQueue = (int) RenderQueue.Transparent;
                    material.SetShaderPassEnabled("ShadowCaster", false);
                    break;
            }
        }
    }
}