Blending normal maps and moving them in opposite directions

Hi everyone!

I'm new to Unity and don't know much about coding. I need to make an aimated texture of a fluid. I have used a modified function in Unreal 4 which takes an input map and moves it in 4 opposing directions + blending 4 images together.

Here is how it looks in Unreal:



Here is an effect I want to repoduce in Unity:



I've looked into a default water shader but looking through code didn't help at all. I don't know how to make it move in different directions and work on non-planar surfaces.

Any suggestions on how to approach this?

 

I think you probably want something like this?

Code (csharp):

1. // Get scroll offset.
2.                 float scrollSpeed = 0.1;
3.                 float scroll = _Time.y * scrollSpeed;
4.                 // Sample normal maps.
5.                 float3 normal1 = UnpackNormal (tex2D (_BumpMap,IN.uv_MainTex + float2(scroll, 0.0))) + float3(0.0, 0.0, 1.0);
6.                 float3 normal2 = UnpackNormal (tex2D (_BumpMap,IN.uv_MainTex + float2(-scroll, 0.0))) * float3(-1.0, -1.0, 1.0);
7.                 float3 normal3 = UnpackNormal (tex2D (_BumpMap,IN.uv_MainTex + float2(0.0, scroll))) * float3(-1.0, -1.0, 1.0);
8.                 float3 normal4 = UnpackNormal (tex2D (_BumpMap,IN.uv_MainTex + float2(0.0, -scroll))) * float3(-1.0, -1.0, 1.0);
9.                 // Combine normals.
10.                 float3 normalFinal = (normal1 * dot (normal1, normal2)) - (normal2 * normal1.z);
11.                 normalFinal += float3(0.0, 0.0, 1.0);
12.                 normalFinal = (normalFinal * dot (normalFinal, normal3)) - (normal3 * normalFinal.z);
13.                 normalFinal += float3(0.0, 0.0, 1.0);
14.                 normalFinal = (normalFinal * dot (normalFinal, normal4)) - (normal4 * normalFinal.z);
15.                 normalFinal = normalize (normalFinal);
16.  

 

thanks! looks like what I need, now I'll try to implement it...