I need an Iridescence shader

Hello guys,

I need an Iridescence shader for my game. Does anyone can make one? I will pay for it.

Regards,
Carlos

 

The simple way would be to have a lookup texture for the Fresnel to do that. That would work on static surfaces. For something like a soap bubble it's a bit more complex though.

Then you can manually create a lookup texture or actually generate one which is a bit more tricky:
https://en.wikipedia.org/wiki/Thin-film_interference

My opinion is still that Unity should offer this out of the box in the standard shader. The simple option to have a lookup texture for Fresnel allows for better approximations for things like metals and adds the option for the average artist to add iridescence.

This also means that the Unity lighting system should actually respect the values in the g-buffer. Whether or not you want to create a PBR base, you should leave this part up to the shader. The shader should output the amount of diffuse and reflection in a PBR way and the lighting calculations should follow this as is. (Currently Unity also adds reflections to surfaces that output 0 reflection/specular in the g-buffer.)

 

I need this shader for fish, so it most be able to perform in dynamic objects that have animations. I don't have any knowledge about shaders, so I am offering to pay for someone to make the shader.

Regards,
Carlos

 

I stumbled across https://assetstore.unity.com/packages/vfx/shaders/iridescence-thin-film-42944 while searching for something similar, but I am not affiliated with the author and have not tested it.
I have a character that has the "blue black" hair that appears relatively blue in light and almost pitch black out of it. I was looking for a shader to create that effect. This one appeared to be a bit more focused on appearing metallic.

 

Give this one a whirl.

Code (CSharp):

1. Shader "Toon/Iridescent" {
2.     Properties{
3.         _Color("Main Color", Color) = (0.5,0.5,0.5,1)
4.        
5.         _MainTex("Base (RGB)", 2D) = "white" {}
6.  
7.     _Noise("Noise (RGB)", 2D) = "white" {} // noise texture
8.     _Ramp("Toon Ramp (RGB)", 2D) = "gray" {}
9.     _IrTex("Iridescence Ramp (RGB)", 2D) = "white" {} // color ramp
10.     _IrColor("Ir Color", Color) = (0.5,0.5,0.5,1)// extra iridescence tinting
11.     _Offset ("Iridescence Ramp Offset", Range (0, 1)) = 1 // offset of the color ramp
12.     _Brightness ("Iridescence Opacity", Range (0, 1)) = 1 // opacity of iridescence
13.     _WorldScale ("Noise Worldscale", Range (.002, 5)) = 1 // noise scale
14.     [Toggle(LM)] _LM("Use Lightmap UVS?", Float) = 0 // use lightmap uvs instead of normal ones
15.  
16.  
17.     }
18.  
19.         SubShader{
20.         Tags{ "RenderType" = "Opaque" }
21.         LOD 200
22.  
23.         CGPROGRAM
24. #pragma surface surf ToonRamp
25. #pragma shader_feature LM
26.         sampler2D _Ramp;
27.  
28.     // custom lighting function that uses a texture ramp based
29.     // on angle between light direction and normal
30. #pragma lighting ToonRamp exclude_path:prepass
31.     inline half4 LightingToonRamp(SurfaceOutput s, half3 lightDir, half atten)
32.     {
33. #ifndef USING_DIRECTIONAL_LIGHT
34.         lightDir = normalize(lightDir);
35. #endif
36.  
37.         half d = dot(s.Normal, lightDir)*0.5 + 0.5;
38.         half3 ramp = tex2D(_Ramp, float2(d,d)).rgb;
39.  
40.         half4 c;
41.         c.rgb = s.Albedo * _LightColor0.rgb * ramp * (atten * 2);
42.         c.a = 0;
43.         return c;
44.     }
45.  
46.  
47.     sampler2D _MainTex;
48.     sampler2D _Noise; // noise
49.     sampler2D _IrTex; // color ramp
50.     float4 _Color;
51.     float4 _IrColor; // extra tinting
52.     float _Offset; // color ramp offset
53.     float _Brightness; // Iridescence opacity
54.     float _WorldScale; // noise scale
55.  
56.     struct Input {
57.         float2 uv_MainTex : TEXCOORD0;
58.         float2 uv2_Noise : TEXCOORD1; // lightmap uvs
59.         float3 viewDir; // view direction
60.     };
61.  
62.     void surf(Input IN, inout SurfaceOutput o) {
63.  
64.         half f = 1 -dot(o.Normal, IN.viewDir) + _Offset; // fresnel
65.         half4 n = tex2D(_Noise, IN.uv_MainTex * _WorldScale); // noise based on the first uv set
66. #if LM
67.         n = tex2D(_Noise, IN.uv2_Noise * _WorldScale); // noise based on the lightmap uv set
68. #endif
69.  
70.         half4 c = tex2D(_MainTex, IN.uv_MainTex ) * _Color;
71.  
72.        
73.         half3 i = tex2D(_IrTex, float2(f,f)+ n).rgb * _IrColor; // iridescence effect
74.        
75.         o.Albedo = (c.rgb) + ((i * n) * _Brightness); // multiplied by original texture, with an opacity float
76.        
77.         o.Alpha = c.a;
78.     }
79.     ENDCG
80.  
81.     }
82.  
83.         Fallback "Diffuse"
84. }

Try it out with the color ramp.
This shader is from https://twitter.com/minionsart and i believe their is a patreon page if you wish to donate.

 

Thank you LoungeKatt and Subliminum,

Both reply are very helpful! I will check that shader from Subliminum and the asset store one. I appreciate very much your help in this matter. I will let you know how it goes.

Regards,
Carlos

 

Also
https://www.alanzucconi.com/2017/07/15/cd-rom-shader-1/

 

Subliminum, I checked the shader Toon/Iridescent, but as the title says it the shader doesn't have any specular, and other properties, so it is not practical for a realistic graphics game. The one in the assets store look very good indeed, I think I will go with that for my game.

neoshaman, that tutorial is very interesting, but I am working in all aspects of my game and don't have time to learn about shaders really. Thank you for the link, it was very interesting read.

Regards,
Carlos

 

Yea if you want to save a few bucks just put the code relating to iridescence into unitys standard shader which has specular and detail maps etc. I cannot recommend learning shaders enough if you end up with the spare time. Good luck with the project!

 

I would love to learn shader programming but I am in a tight deadline with the Xbox One folks so I really can't at least for this game, but you can be sure I will as soon as I have a down time. I think it is one of the most important knowledge to have if you want to create a nice looking and fast fps game. Anyways thank you for your input, very appreciated.

Regards,
Carlos

 

# Iridescence Shader






you can download this shader from my github :
https://github.com/smkplus/Iridescence

 

Seyed_Morteza_Kamaly,

I appreciate very much you offering a shader for free. The problem that the shader I am looking for most have specular, smoothness, and the other properties of the standard Unity shader. To be more clear I need this shader to create realistic fish skin, like Tuna, Jacks, Barracudas, etc... This type of fish's skin are Iridescent. But your offer is very nice.

Regards,
Carlos

 

Hi Dear Friend I added Surface Shader to my repository
some new properties
BumpMap
BumpPower
Metallic
Glossiness
Hue
Saturation
Brightness
Contrast

 

@Seyed_Morteza_Kamaly Thanks for sharing, looks really nice. Any change to add license, that allows us to use it in our games?

 

I'll do it...It's free to use

 

Thx

 

@Seyed_Morteza_Kamaly,

Thank you so much!! This is perfect brother, exactly what I was looking for! I tested last night and it works perfectly. I appreciate it very much, thanks a bunch!

Regards,
Carlos

 

It was my pleasure to help you.

 

I Added Anisotropic Iridescence

 

Wow! this is super cool brother!! Great work! You remind me of when there were a lot of people in these forums helping each other instead of selling everything in the asset store. Now a days pretty much everything has to be bought and there are more people selling assets than creating games. Any way...

Great job and thanks again brother.

Regards,
Carlos

 

Currently I'm working on Iridescent bubble

 

I made a Tutorial about Iridescent Shader

Tutorial : https://www.patreon.com/posts/18699278
Youtube : https://www.youtube.com/watch?v=l2jQC3UdWxU
Source : https://github.com/smkplus/Iridescence

Please support me to making more tutorials

 

@Seyed_Morteza_Kamaly, love it, thanks for your work. <3

 

I just noticed this thread. Thank you very much for providing these shaders. I found good use for the soap bubbles here:

Now people keep asking me to provide a GitHub repo for the bubble instantiation and wrapping around an enemy. Is it okay to integrate your shader into my repo if I create one, credits of course to you for the bubbles. I see it's MIT licensed, but since it's all based on your work, I'd like to ask you nontheless.

 

Nice Job!
I'm so glad it helped you
it's free to use you can share with anyone
thank you for using my shader

 

What happened to the tutorial? It's gone.

 

Hi Danny unfortunately Patreon closed my page because I'm an Iranian developer and I lost my funds and access to my page.

 

Sorry to hear! A great pity. Now I know why the screenshots aren't visible, too. All the best to you!

Would you mind if @Rowlan re-shared your wonderful shaders and tech and whatever they have of this direction?

If Rowlan still has the stuff, and the time to share, it... obviously, too.

 

That's tough to hear. One of the reasons I don't like Patreon. Do you have a donation account other than Patreon?

I do, but Seyed's GitHub page is still here:

https://github.com/smkplus/Iridescence

 

God bless you dude