Resolved Runtime transparency & materials instanciation

Hi

I'm working with HDRP in unity 2020.3.14

I'm trying to make runtime transparency. To do so, I modified a shader with shader graph (HDRP/AutodekInteractive) to fit my needs. The detail of my shader modifications is here : https://forum.unity.com/threads/opacity-map-in-hdrp-shader-graph.1195813/ (sorry but as the number of screenshots per post is limited, I cannot just paste it again here). The shader works well.

So right now I have a custom shader that deals with transparency. But When I'm trying to use it at runtime (I mean create a runtime material and play with the shader parameters) it doesn't behave as intended.

I made a small demo scene of my problem as an illustration :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class test_temp_script : MonoBehaviour
6. {
7.  
8.     private Material premadeMaterial;
9.     private Material runtimeMaterial;
10.  
11.     public GameObject cube1;
12.     public GameObject cube2;
13.  
14.     // Start is called before the first frame update
15.     void Start()
16.     {
17.         runtimeMaterial = new Material(Shader.Find("HDRP/Autodesk Interactive/AutodeskInteractiveCustom"));
18.         runtimeMaterial.EnableKeyword("_OpacityMap");
19.         runtimeMaterial.EnableKeyword("_UseOpacityMap");
20.         runtimeMaterial.EnableKeyword("_Opacity");
21.  
22.         premadeMaterial = Instantiate(Resources.Load<Material>("TransparentMaterial"));
23.  
24.         cube1.GetComponent<Renderer>().material = runtimeMaterial;
25.         cube2.GetComponent<Renderer>().material = premadeMaterial;
26.  
27.         runtimeMaterial.SetInt("_UseColorMap", 0);
28.         runtimeMaterial.SetColor("_Color", Color.green);
29.  
30.         premadeMaterial.SetInt("_UseColorMap", 0);
31.         premadeMaterial.SetColor("_Color", Color.green);
32.     }
33.  
34.  
35.     public void setTransparent()
36.     {
37.         // ---------------------------------------------------------- CUBE 1 (runtime mat)
38.  
39.         Debug.Log("------------------------------------ base values :");
40.  
41.         Debug.Log(runtimeMaterial.GetInt("_UseOpacityMap"));
42.         Debug.Log(runtimeMaterial.GetColor("_Opacity"));
43.         Debug.Log(runtimeMaterial.GetTexture("_OpacityMap"));
44.         Debug.Log(runtimeMaterial.GetFloat("_SurfaceType"));
45.  
46.         Debug.Log("------------------------------------ new values :");
47.  
48.         runtimeMaterial.SetInt("_UseOpacityMap",0);
49.         runtimeMaterial.SetColor("_Opacity", Color.gray);
50.  
51.         Debug.Log(runtimeMaterial.GetInt("_UseOpacityMap"));
52.         Debug.Log(runtimeMaterial.GetColor("_Opacity"));
53.         Debug.Log(runtimeMaterial.GetTexture("_OpacityMap"));
54.         Debug.Log(runtimeMaterial.GetFloat("_SurfaceType"));
55.  
56.         // ---------------------------------------------------------- CUBE 2 (premade mat)
57.  
58.         premadeMaterial.SetInt("_UseOpacityMap", 0);
59.         premadeMaterial.SetColor("_Opacity", Color.gray);
60.     }
61. }

at runtime, when I call "setTransparent()" I expect the 2 cubes to look the same. But here is what happen:



While the cube2 (with the "premadeMaterial" in my code) behave as expected, the cube 1 doesn't get transparent. But according to the console, the material "knows" the correct values, so I don't understand why it doesn't work



Moreover, as soon as I click to expend my cube1 material in the inspector, cube1 suddently become transparent !




Of course I spent the last couple of days googling about this problem, but the conclusion of all the informations I gathered was, that those lines

Code (CSharp):

1. runtimeMaterial.EnableKeyword("_OpacityMap");
2. runtimeMaterial.EnableKeyword("_UseOpacityMap");
3. runtimeMaterial.EnableKeyword("_Opacity");

should have solved the problem. But it did not

PS: I also tried with this instead :

Code (CSharp):

1. runtimeMaterial.EnableKeyword("OpacityMap");
2.         runtimeMaterial.EnableKeyword("UseOpacityMap");
3.         runtimeMaterial.EnableKeyword("Opacity");

But the result is the same

 

I successfully made it works by instantiating the material this way :

Code (CSharp):

1. runtimeMaterial = new Material(Shader.Find("HDRP/Autodesk Interactive/AutodeskInteractiveCustom"));
2.  
3.         runtimeMaterial.EnableKeyword("_DISABLE_DECALS");
4.         runtimeMaterial.EnableKeyword("_DISABLE_SSR_TRANSPARENT");
5.         runtimeMaterial.EnableKeyword("_ENABLE_FOG_ON_TRANSPARENT");
6.         runtimeMaterial.EnableKeyword("_SURFACE_TYPE_TRANSPARENT");
7.  
8.         runtimeMaterial.SetFloat("_SurfaceType", 1f);
9.         runtimeMaterial.SetFloat("_SrcBlend", (float)UnityEngine.Rendering.BlendMode.One);
10.         runtimeMaterial.SetFloat("_DstBlend", (float)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
11.         runtimeMaterial.SetFloat("_ZWrite", 1.0f);
12.         runtimeMaterial.DisableKeyword("_ALPHATEST_ON");
13.         runtimeMaterial.DisableKeyword("_ALPHABLEND_ON");
14.         runtimeMaterial.EnableKeyword("_ALPHAPREMULTIPLY_ON");
15.         runtimeMaterial.renderQueue = 3000;

I found those keywords to add ("_DISABLE_DECALS", "_DISABLE_SSR_TRANSPARENT", "_ENABLE_FOG_ON_TRANSPARENT" and "_SURFACE_TYPE_TRANSPARENT" by looking at the "premade material" in debug mode