Splat map shader with more then 4 textues

I'm working on a procedural universe and it's coming of pretty nice so far, here are some first planet tests:




But currently I'm hold back because I can't get more then 4 textures on my planet.
Currently I use the Unity terrain FirstPass shader:

Code (CSharp):

1. Shader "Custom/Splatmap/Lightmap-FirstPass" {
2. Properties {
3.     _Control ("Control (RGBA)", 2D) = "red" {}
4.     _Splat3 ("Layer 3 (A)", 2D) = "white" {}
5.     _Splat2 ("Layer 2 (B)", 2D) = "white" {}
6.     _Splat1 ("Layer 1 (G)", 2D) = "white" {}
7.     _Splat0 ("Layer 0 (R)", 2D) = "white" {}
8.     // used in fallback on old cards
9.     _MainTex ("BaseMap (RGB)", 2D) = "white" {}
10.     _Color ("Main Color", Color) = (1,1,1,1)
11. }
12.    
13. SubShader {
14.     Tags {
15.         "SplatCount" = "4"
16.         "Queue" = "Geometry-100"
17.         "RenderType" = "Opaque"
18.     }
19.  
20. CGPROGRAM
21. #pragma surface surf Lambert
22. struct Input {
23.     float2 uv_Control : TEXCOORD0;
24.     float2 uv_Splat0 : TEXCOORD1;
25.     float2 uv_Splat1 : TEXCOORD2;
26.     float2 uv_Splat2 : TEXCOORD3;
27.     float2 uv_Splat3 : TEXCOORD4;
28. };
29.  
30. sampler2D _Control;
31. sampler2D _Splat0,_Splat1,_Splat2,_Splat3;
32.  
33. void surf (Input IN, inout SurfaceOutput o) {
34.     fixed4 splat_control = tex2D (_Control, IN.uv_Control);
35.     fixed3 col;
36.     col  = splat_control.r * tex2D (_Splat0, IN.uv_Splat0).rgb;
37.     col += splat_control.g * tex2D (_Splat1, IN.uv_Splat1).rgb;
38.     col += splat_control.b * tex2D (_Splat2, IN.uv_Splat2).rgb;
39.     col += splat_control.a * tex2D (_Splat3, IN.uv_Splat3).rgb;
40.     o.Albedo = col;
41.     o.Alpha = 0.0;
42. }
43. ENDCG
44. }
45.  
46. // Fallback to Diffuse
47. Fallback "Diffuse"
48. }
49.  

Now I know that Unity uses this second shader AddPass when the terrain uses more then 4 textures:

Code (CSharp):

1. Shader "Custom/Splatmap/Lightmap-AddPass" {
2. Properties {
3.     _Control ("Control (RGBA)", 2D) = "black" {}
4.     _Splat3 ("Layer 3 (A)", 2D) = "white" {}
5.     _Splat2 ("Layer 2 (B)", 2D) = "white" {}
6.     _Splat1 ("Layer 1 (G)", 2D) = "white" {}
7.     _Splat0 ("Layer 0 (R)", 2D) = "white" {}
8. }
9.    
10. SubShader {
11.     Tags {
12.         "SplatCount" = "4"
13.         "Queue" = "Geometry-99"
14.         "IgnoreProjector"="True"
15.         "RenderType" = "Opaque"
16.     }
17.    
18. CGPROGRAM
19. #pragma surface surf Lambert decal:add
20. struct Input {
21.     float2 uv_Control : TEXCOORD0;
22.     float2 uv_Splat0 : TEXCOORD1;
23.     float2 uv_Splat1 : TEXCOORD2;
24.     float2 uv_Splat2 : TEXCOORD3;
25.     float2 uv_Splat3 : TEXCOORD4;
26. };
27.  
28. sampler2D _Control;
29. sampler2D _Splat0,_Splat1,_Splat2,_Splat3;
30.  
31. void surf (Input IN, inout SurfaceOutput o) {
32.     fixed4 splat_control = tex2D (_Control, IN.uv_Control);
33.     fixed3 col;
34.     col  = splat_control.r * tex2D (_Splat0, IN.uv_Splat0).rgb;
35.     col += splat_control.g * tex2D (_Splat1, IN.uv_Splat1).rgb;
36.     col += splat_control.b * tex2D (_Splat2, IN.uv_Splat2).rgb;
37.     col += splat_control.a * tex2D (_Splat3, IN.uv_Splat3).rgb;
38.     o.Albedo = col;
39.     o.Alpha = 0.0;
40. }
41. ENDCG
42. }
43.  
44. Fallback off
45. }
46.  

But I need some help to get this to work on my planets, how do I get this AddPass to work?
Do I need to set it up from my script? And how do I do this?

I also tried adding more splat maps to the FirstPass shader but then I got out of resources.

 

Add more materials to Mesh Renderer materials.

 

ooh wauw! That easy...
Thanks man! I spend so many hours on this, didn't know you could add more materials...

 

Hi,

Nice Work Nieles!!!

I'm pretty interested how you UVMap the sphere to make no seams...

Can you explain me that?

Thanks!!!

 

In computer graphics, cube mapping is a method of environment mappingthat uses the six faces of a cube as the map shape. The environment is projected onto the sides of a cube and stored as six square textures, or unfolded into six regions of a single texture.

 

Hi!
I would like to know how to get that kind of shader to work with custom made meshes (like here). I have Unity 2019.4 and downloaded the built-in shaders already, there is a folder "TerrainShaders/Splats" - 12 files in it.
All take only a Basemap, maximum a Holemap. I guess not really suited?