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# Water Caustics Shader Water Caustics Shader implemented with Shader Graph in **Unity 2021.3.10f1** ## Screenshots  https://user-images.githubusercontent.com/4588601/211918738-9f72c5b9-2ac6-4491-82b6-a09dcaf548a7.mp4 ## Table of Content - [Scene Setup](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#scene-setup) - [HLSL](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#hlsl) - [Main Light](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#main-light) - [UV Rotation](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#uv-rotation) - [Triplanar Projection](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#triplanar-projection) - [Shader Graph](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#shader-graph) - [Caustics Tiling and Speed](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#caustics-tiling-and-speed) - [Caustics Texture Rotation](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#caustics-texture-rotation) - [Caustics Distortion](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#caustics-distortion) - [Caustics Distorted Triplanar](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#caustics-distorted-triplanar) - [Caustics End Result](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#caustics-end-result) - [Additive Caustics](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#additive-caustics) - [Oclussion](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#oclussion) - [Oclussion Screenshots](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#oclussion-screenshots) - [Global Illumination](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#global-illumination) - [Complete Graph](https://github.com/z4gon/water-caustics-shader-unity/blob/master/#complete-graph) ## Resources - [Jettelly Caustics Tutorial 1](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://www.youtube.com/watch?v=uxJZghsWQ-s) - [Jettelly Caustics Tutorial 2](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://www.youtube.com/watch?v=f_o51cXyQXU) - [Caustics Texture](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://graphicdesign.stackexchange.com/questions/4725/how-can-i-create-a-large-size-water-caustics-texture-for-animation) - [Stylized Skybox](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://assetstore.unity.com/packages/2d/textures-materials/sky/free-stylized-skybox-212257) - [Custom Lighting in Shader Graph](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://blog.unity.com/technology/custom-lighting-in-shader-graph-expanding-your-graphs-in-2019) - [Triplanar ShaderGraph Node HLSL code](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://docs.unity3d.com/Packages/com.unity.shadergraph@12.1/manual/Triplanar-Node.html) - [UV Rotation ShaderGraph Node HLSL code](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://docs.unity3d.com/Packages/com.unity.shadergraph@12.1/manual/Rotate-Node.html) ## Scene Setup - Built a basic pool and put some primitive objects inside. - Used the stlylized skybox to make the scene look more polished.  ## HLSL ### Main Light - Based on the example for implementing [custom lighting in Shader Graph](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://blog.unity.com/technology/custom-lighting-in-shader-graph-expanding-your-graphs-in-2019), we define the custom HLSL function to get the main light. - `SHADERGRAPH_PREVIEW` will be true while developing the shader in the Shader Graph node editor. ```c void MainLight_half( in float3 WorldPos, out half3 Direction, out half3 Color, out half DistanceAtten, out half ShadowAtten ) { #if SHADERGRAPH_PREVIEW Direction = half3(0.5, 0.5, 0); Color = 1; DistanceAtten = 1; ShadowAtten = 1; #else #if SHADOWS_SCREEN half4 clipPos = TransformWorldToHClip(WorldPos); half4 shadowCoord = ComputeScreenPos(clipPos); #else half4 shadowCoord = TransformWorldToShadowCoord(WorldPos); #endif Light mainLight = GetMainLight(shadowCoord); Direction = mainLight.direction; Color = mainLight.color; DistanceAtten = mainLight.distanceAttenuation; ShadowAtten = mainLight.shadowAttenuation; #endif } ``` ### UV Rotation - Simply a copy paste of the HLSL code from the documentation for the [Shader Graph Node to do UV roation](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://docs.unity3d.com/Packages/com.unity.shadergraph@12.1/manual/Rotate-Node.html). ```c float2 Unity_Rotate_Degrees_float(float2 UV, float2 Center, float Rotation) { Rotation = Rotation * (3.1415926f/180.0f); UV -= Center; float s = sin(Rotation); float c = cos(Rotation); float2x2 rMatrix = float2x2(c, -s, s, c); rMatrix *= 0.5; rMatrix += 0.5; rMatrix = rMatrix * 2 - 1; UV.xy = mul(UV.xy, rMatrix); UV += Center; return UV; } ``` ### Triplanar Projection - Based on the HLSL code from the [Shader Graph Node to do Triplanar Projection](https://github.com/z4gon/water-caustics-shader-unity/blob/master/https://docs.unity3d.com/Packages/com.unity.shadergraph@12.1/manual/Triplanar-Node.html). - The modifications for this include passing in a **Speed** and **Rotation** for the UVs. - The **offset** will be calculated with **Time** and **Speed**. - The **rotation** will be used with the previously defined HLSL function. - This returns a **projection** based on the **world position** of the **vertices**, using each **plane** as an **UV mapping**. - This means the **projection** will always be the same, no matter the shape or position of the object. - There will be a **blending** done using the Normals orientation and a blend parameter. ```c void TriplanarProjection_float( in Texture2D Texture, in SamplerState Sampler, in float3 Position, // world space in float3 Normal, // world space in float Tile, in float Blend, // UV manipulation in float Speed, in float Rotation, out float4 Out ) { float3 Node_UV = Position * Tile; // animate UVs float Offset_UV = _Time.y * Speed; float3 Node_Blend = pow(abs(Normal), Blend); Node_Blend /= dot(Node_Blend, 1.0); float4 Node_X = SAMPLE_TEXTURE2D(Texture, Sampler, Unity_Rotate_Degrees_float(Node_UV.zy, 0, Rotation) + Offset_UV); float4 Node_Y = SAMPLE_TEXTURE2D(Texture, Sampler, Unity_Rotate_Degrees_float(Node_UV.xz, 0, Rotation) + Offset_UV); float4 Node_Z = SAMPLE_TEXTURE2D(Texture, Sampler, Unity_Rotate_Degrees_float(Node_UV.xy, 0, Rotation) + Offset_UV); Out = Node_X * Node_Blend.x + Node_Y * Node_Blend.y + Node_Z * Node_Blend.z; } ``` ## Shader Graph ### Caustics Tiling and Speed - Define a **Custom Function** **Node** using the **Triplanar Projection** we defined in **HLSL**. - Set a **Caustics Texture**, a **Tiling** and a **Speed** for the **Offset** of the **UVs**.  ### Caustics Texture Rotation - Make one of the Caustic Textures **rotated** by the amount determined by **Caustic Texture Rotation**.  ### Caustics Distortion - Use the **Caustics Distortion Speed** multiplied by **Time**, to offset a **Vector2** composed by the **RG** channels of the **World Position** of the vertices. - Divide by **Caustics Distortion Factor**, to further modify the distortion. - Use **Caustics Distortion Scale** to control the scale of the noise.  https://user-images.githubusercontent.com/4588601/211901682-5cbfd3ca-0a71-4f15-9897-67d1f4868c0e.mp4 ### Caustics Distorted Triplanar - Use the **distorted** **World Position** of the vertices as input to **sample** the **Triplanar Projection**.  ### Caustics End Result - The end result simulates the caustics of the water surface, but a much lower computational cost.  https://user-images.githubusercontent.com/4588601/211900812-34b712c9-1257-4040-b864-cac7d016a8e0.mp4 ### Additive Caustics - **Add** the **caustics color** to a **primary Texture**, to **overlay** on top of whatever color the object has.  https://user-images.githubusercontent.com/4588601/211900916-0e3bea64-8756-44cb-83bf-23b42d215aae.mp4 ### Oclussion - Use a **Custom Function Node** to execute the **MainLight** **HLSL** function we wrote earlier. - Get the **Direction**, **Color**, **Distance Attenuation** and **Shadow Attenuation** for the main light. - Calculate a simple **Lambert shading** using the **dot** product of the **light direction** and the **Normal Vector**. - Multiply the **Distance** and **Shadow Attenuations** by the **Color** of the light. - Multiply everything together to calculate a **colorized oclussion mask** for the **caustics**.  #### Oclussion Screenshots - Using different angles of light. https://user-images.githubusercontent.com/4588601/211918820-b7c9ca96-4518-42d9-b831-070ebcca4f11.mp4    ### Global Illumination - Use the **Baked GI Node** to access the **Ambient/Global Illumination** from the Scene. - Multiply it by the **Albedo** color coming from the **Main Texture**.  https://user-images.githubusercontent.com/4588601/211918916-080f125c-ab90-44f1-b358-946a7c6546d0.mp4 ### Complete Graph - Multiply the **Oclussion** by the **Caustics** to mask it out. - Multiply the **Ocluded Caustics** by the **Albedo + Global Illumination**. 

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