Generating Water Textures with Perlin Noise

just did one more test on the perlin noise - a poor man version of ocean shader. well, not realities at all but it is cheap only using 1 drawing call and everything running inside the shader



[ webplayer ]
http://homepage.mac.com/antonioh/unity3d/build/Perlin_Ocean.html

[ sample video ]
http://www.youtube.com/watch?v=RYClXUSh-S4

Basically, it is a very simple shader. Its use 2 channel of 2D Perlin noise to generate the normal.

Code (csharp):

1. float4 fragment_shader( v2f IN, out float4 finalcolor): COLOR
2. {  
3.     float2 ph   = float2(shift_x, shift_y); // Phase Shift
4.     float2 time = float2(_SinTime.w, _CosTime.w);
5.    
6.     ph          += time /3.0;
7.     freq_0.xy   += time /5.0;
8.        
9.     float n0    = noise(IN.texcoord*freq_0.xy    )*freq_0.w;
10.     float n1    = noise(IN.texcoord*freq_0.xy +ph)*freq_0.w;
11.    
12.     float nx = n0-n1;
13.     float ny = n0-n1;
14.          
15.     float nz = sqrt(max(0, 1-(nx*nx+ny*ny*freq_0.z)));
16.     float3 normal = normalize(float3(nx, ny, nz ));
17.    
18.     float4 c = tex2D(color_map,IN.texcoord*8.0 +ph*0.1)*nz;
19.    
20.     float3 L    = normalize(IN.light);
21.     float3 V    = normalize(IN.eye);
22.     float diff  = saturate(dot(L,normal));
23.     float spec  = saturate(dot(normalize(L-V),normal));
24.     float att   = 1.0 - max(0,L.z);
25.     att = 1.0 - att*att;
26.        
27.     return c*ambient_color + att*(c*diffuse_color*diff+specular_color*pow(spec,shine));
28. }
29.  

I also, put in some code to animate the vertex too

Code (csharp):

1.     float4 pos = float4(IN.vertex.xyz, 1.0);
2.     float3 d = 0.25- min(0.25, distance(_ObjectSpaceCameraPos, pos.xyz) *0.025);
3.     pos.y = cos(pos.x *_SinTime.x + pos.z *_CosTime.x) *d;

Enjoy !

 

Nice!

 

Hi there, this shader actually looks pretty good for me game. But I'm new to shaders and I'm not sure how to create it. Do I create a new Shader in unity and then paste in the code into the shader? if so, do I replace the original code in there?

-JJ

 

Hi,friend，I'm a new to shader, I just new a shader and use your code to replace the CGPROGRAM part,but it said " Shader error in 'Custom/wate': Syntax error at line 12 ",I don't know how to use your code to make a complete shader,could you tell the whole shader code or give us some advice about how to make a shader with HLSL?

 

I second this. Can someone please explain further on where this fits in? This is all I see right now when creating a new shader...no idea where this goes. trial and error aint working...

Code (csharp):

1. Shader "Custom/waterTest" {
2.     Properties {
3.         _MainTex ("Base (RGB)", 2D) = "white" {}
4.     }
5.     SubShader {
6.         Tags { "RenderType"="Opaque" }
7.         LOD 200
8.        
9.         CGPROGRAM
10.         #pragma surface surf Lambert
11.  
12.         sampler2D _MainTex;
13.  
14.         struct Input {
15.             float2 uv_MainTex;
16.         };
17.  
18.         void surf (Input IN, inout SurfaceOutput o) {
19.             half4 c = tex2D (_MainTex, IN.uv_MainTex);
20.             o.Albedo = c.rgb;
21.             o.Alpha = c.a;
22.         }
23.         ENDCG
24.     }
25.     FallBack "Diffuse"
26. }