(Solved) Modifying default shaders

Hello, I need to copy and modify default URP shader just to add some new properties.
But there is one problem: default shaders use Custom Shader GUI, so I have trouble displaying the new properties.

I tried to copy and modify Custom GUI scripts, but I can't use SavedBool class, seems like it is a part of the internal Unity API.

Is there any other way to make it work? I just need to add some properties to the Unlit Particle shader while preserving default shader settings functionality, and it doesn't really matter how exactly these properties will be displayed.

 

Okay, it was easier than I thought.
Here is example how you can add properties to the default shaders by modifying their CustomGUI script.

[These 3x //IMPORTANT lines are all what you need to display one property in Surface Inputs]

Spoiler: Code

Code (CSharp):

1. using System;
2. using System.Collections.Generic;
3. using UnityEditor;
4. using UnityEditor.Rendering.Universal.ShaderGUI;
5. using UnityEngine;
6.  
7. namespace SomeNamespace
8. {
9.     internal class ParticlesUnlitShader : BaseShaderGUI
10.     {
11.         private BakedLitGUI.BakedLitProperties shadingModelProperties;
12.         private ParticleGUI.ParticleProperties particleProps;
13.  
14.         private MaterialProperty SomeProperty; //IMPORTANT
15.  
16.         List<ParticleSystemRenderer> m_RenderersUsingThisMaterial = new List<ParticleSystemRenderer>();
17.  
18.         public override void FindProperties(MaterialProperty[] properties)
19.         {
20.             base.FindProperties(properties);
21.             shadingModelProperties = new BakedLitGUI.BakedLitProperties(properties);
22.             particleProps = new ParticleGUI.ParticleProperties(properties);
23.  
24.             SomeProperty = FindProperty("_SomeProperty", properties); //IMPORTANT
25.         }
26.  
27.         //...
28.         //MaterialChanged
29.         //DrawSurfaceOptions
30.         //...
31.  
32.         public override void DrawSurfaceInputs(Material material)
33.         {
34.             base.DrawSurfaceInputs(material);
35.             BakedLitGUI.Inputs(shadingModelProperties, materialEditor);
36.             DrawEmissionProperties(material, true);
37.  
38.             materialEditor.FloatProperty(SomeProperty, "Some Property Name Visible In Editor"); //IMPORTANT
39.         }
40.  
41.         //...
42.         //DrawAdvancedOptions
43.         //OnOpenGUI
44.         //CacheRenderersUsingThisMaterial
45.     }
46. }

 

i have the same problem..
So whats exactly the reason why we cant use SavedBool class?