HeavenStudioPlus/Assets/PostProcessingOutlines/PostProcessOutline.cs

using System;
using UnityEngine;
using UnityEngine.Rendering.PostProcessing;

[Serializable]
[PostProcess(typeof(PostProcessOutlineRenderer), PostProcessEvent.BeforeStack, "Roystan/Post Process Outline")]
public sealed class PostProcessOutline : PostProcessEffectSettings
{
    [Tooltip("Number of pixels between samples that are tested for an edge. When this value is 1, tested samples are adjacent.")]
    public IntParameter scale = new IntParameter { value = 1 };
    public ColorParameter color = new ColorParameter { value = Color.white };
    [Tooltip("Difference between depth values, scaled by the current depth, required to draw an edge.")]
    public FloatParameter depthThreshold = new FloatParameter { value = 1.5f };
    [Range(0, 1), Tooltip("The value at which the dot product between the surface normal and the view direction will affect " +
        "the depth threshold. This ensures that surfaces at right angles to the camera require a larger depth threshold to draw " +
        "an edge, avoiding edges being drawn along slopes.")]
    public FloatParameter depthNormalThreshold = new FloatParameter { value = 0.5f };
    [Tooltip("Scale the strength of how much the depthNormalThreshold affects the depth threshold.")]
    public FloatParameter depthNormalThresholdScale = new FloatParameter { value = 7 };
    [Range(0, 1), Tooltip("Larger values will require the difference between normals to be greater to draw an edge.")]
    public FloatParameter normalThreshold = new FloatParameter { value = 0.4f };    
}

public sealed class PostProcessOutlineRenderer : PostProcessEffectRenderer<PostProcessOutline>
{
    public override void Render(PostProcessRenderContext context)
    {
        var sheet = context.propertySheets.Get(Shader.Find("Hidden/Roystan/Outline Post Process"));
        sheet.properties.SetFloat("_Scale", settings.scale);
        sheet.properties.SetColor("_Color", settings.color);
        sheet.properties.SetFloat("_DepthThreshold", settings.depthThreshold);
        sheet.properties.SetFloat("_DepthNormalThreshold", settings.depthNormalThreshold);
        sheet.properties.SetFloat("_DepthNormalThresholdScale", settings.depthNormalThresholdScale);
        sheet.properties.SetFloat("_NormalThreshold", settings.normalThreshold);
        sheet.properties.SetColor("_Color", settings.color);

        Matrix4x4 clipToView = GL.GetGPUProjectionMatrix(context.camera.projectionMatrix, true).inverse;
        sheet.properties.SetMatrix("_ClipToView", clipToView);

        context.command.BlitFullscreenTriangle(context.source, context.destination, sheet, 0);
    }
}