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Commit 4498451

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author
Adam Leung
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‎Assets/Scripts/RainbowColour.cs

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public class RainbowColour : MonoBehaviour {
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//References to render and material
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Renderer rend;
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Material material;
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// Use this for initialization
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void Start () {
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//Get references,
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rend = GetComponent<Renderer>();
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material = rend.material;
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//Set shader value with name "_Colour" to Color.magenta
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material.SetColor("_Colour", Color.magenta);
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}
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‎Assets/Shaders/Tutorial_Shader.shader

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Shader "Unlit/Tutorial_Shader" {
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Properties {
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_Colour ("Colour", Color) = (1, 1, 1, 1)
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_MainTexture ("Main Texture", 2D) = "white" {}
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_DissolveTexture ("Dissolve Texture", 2D) = "white" {}
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_DissolveCutoff ("Dissolve Cutoff", Range(0, 1)) = 1
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_ExtrudeAmount ("Extrue Amount", float) = 0
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Shader "Unlit/Tutorial_Shader" {//ShaderLab code
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Properties {//Properties/Custom data we want to use
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_Colour ("Colour", Color) = (1, 1, 1, 1)//Tint colour
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_MainTexture ("Main Texture", 2D) = "white" {}//Texture map
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_DissolveTexture ("Dissolve Texture", 2D) = "white" {}//Black and white dissolve texture
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_DissolveCutoff ("Dissolve Cutoff", Range(0, 1)) = 1//Dissolve threshold
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_ExtrudeAmount ("Extrue Amount", float) = 0//How far out to extrude the model
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}
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SubShader {
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Pass {
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CGPROGRAM
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SubShader { //We can have multiple subshaders. Especially useful for multiple platforms/quality levels
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Pass { //Can have > 1 pass, each adding a draw call. Useful/Mandatory for many effects
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CGPROGRAM //Start of Cg code
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//Define what our vertex and fragment shaders are called
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#pragma vertex vertexFunction
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#pragma fragment fragmentFunction
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//Include Unity helper functions
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#include "UnityCG.cginc"
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//Data we want to retrieve from our model
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//Such as: Vertices, normal, colour, UV coordinates, etc.
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struct appdata {
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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float3 normal : NORMAL;
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};
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//The object we're building and passing to our fragment function
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//We're going to give the fragment function information about the model's...
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struct v2f {
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float4 position : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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//Properties. Note the same names as above.
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float4 _Colour;
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sampler2D _MainTexture;
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sampler2D _DissolveTexture;
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float _DissolveCutoff;
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float _ExtrudeAmount;
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//Vertex function, outputs data in v2f struct
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v2f vertexFunction (appdata IN) {
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v2f OUT;
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v2f OUT; //Create empty output
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//Move the vertices of our object along their normals (facing directions)
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//Animate the distance over time, with magnitude _ExtrudeAmount
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IN.vertex.xyz += IN.normal.xyz * _ExtrudeAmount * sin(_Time.y);
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//Return position that is translated from local object space to clip space
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OUT.position = UnityObjectToClipPos(IN.vertex);
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//Simply carry over the same UV coordinates
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OUT.uv = IN.uv;
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return OUT;
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}
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//Fragment function, outputs (R, G, B, A) colours to render
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fixed4 fragmentFunction (v2f IN) : SV_TARGET {
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//Sample main texture for colour
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float4 textureColour = tex2D(_MainTexture, IN.uv);
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//Sample dissolve texture for dissolve colour,
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float4 dissolveColour = tex2D(_DissolveTexture, IN.uv);
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//Check if colour in dissolve texture is over a certain threshold
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//If not, (ie: negative value) then discard the pixel
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clip(dissolveColour.rgb - _DissolveCutoff);
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//Otherwise, if we get here just return tinted colour from our main texture
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return textureColour * _Colour;
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}
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ENDCG
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}
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}
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}
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ENDCG//End of Cg code
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}//End of pass
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}//End of SubShader
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}//End of Shader!

‎README.md

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}
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}
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```
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*(If you want to see a commented version, go [here.](./Assets/Shaders/Tutorial_Shader.shader))*
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## Part 7: Scripting and Shaders
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![Scripting and Shaders 3](./Images/Scripting_and_Shaders_3.gif)
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*(If you want to see a commented version of the script, go [here.](./Assets/Scripts/RainbowColour.cs))*
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There are many functions for getting and setting properties for materials from within scripts, and you can find all of them [here.](https://docs.unity3d.com/ScriptReference/Material.html)
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## Part 8: Shadows? Surface Shaders?

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