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Shader "Tutorial/032_ImprovedToon" {
//show values to edit in inspector
Properties {
[Header(Base Parameters)]
_Color ("Tint", Color) = (1, 1, 1, 1)
_MainTex ("Texture", 2D) = "white" {}
_Specular ("Specular Color", Color) = (1,1,1,1)
[HDR] _Emission ("Emission", color) = (0 ,0 ,0 , 1)
[Header(Lighting Parameters)]
_ShadowTint ("Shadow Color", Color) = (0.5, 0.5, 0.5, 1)
[IntRange]_StepAmount ("Shadow Steps", Range(1, 16)) = 2
_StepWidth ("Step Size", Range(0, 1)) = 0.25
_SpecularSize ("Specular Size", Range(0, 1)) = 0.1
_SpecularFalloff ("Specular Falloff", Range(0, 2)) = 1
}
SubShader {
//the material is completely non-transparent and is rendered at the same time as the other opaque geometry
Tags{ "RenderType"="Opaque" "Queue"="Geometry"}
CGPROGRAM
//the shader is a surface shader, meaning that it will be extended by unity in the background to have fancy lighting and other features
//our surface shader function is called surf and we use our custom lighting model
//fullforwardshadows makes sure unity adds the shadow passes the shader might need
#pragma surface surf Stepped fullforwardshadows
#pragma target 3.0
sampler2D _MainTex;
fixed4 _Color;
half3 _Emission;
fixed4 _Specular;
float3 _ShadowTint;
float _StepWidth;
float _StepAmount;
float _SpecularSize;
float _SpecularFalloff;
struct ToonSurfaceOutput{
fixed3 Albedo;
half3 Emission;
fixed3 Specular;
fixed Alpha;
fixed3 Normal;
};
//our lighting function. Will be called once per light
float4 LightingStepped(ToonSurfaceOutput s, float3 lightDir, half3 viewDir, float shadowAttenuation){
//how much does the normal point towards the light?
float towardsLight = dot(s.Normal, lightDir);
//stretch values so each whole value is one step
towardsLight = towardsLight / _StepWidth;
//make steps harder
float lightIntensity = floor(towardsLight);
// calculate smoothing in first pixels of the steps and add smoothing to step, raising it by one step
// (that's fine because we used floor previously and we want everything to be the value above the floor value,
// for example 0 to 1 should be 1, 1 to 2 should be 2 etc...)
float change = fwidth(towardsLight);
float smoothing = smoothstep(0, change, frac(towardsLight));
lightIntensity = lightIntensity + smoothing;
// bring the light intensity back into a range where we can use it for color
// and clamp it so it doesn't do weird stuff below 0 / above one
lightIntensity = lightIntensity / _StepAmount;
lightIntensity = saturate(lightIntensity);
#ifdef USING_DIRECTIONAL_LIGHT
//for directional lights, get a hard vut in the middle of the shadow attenuation
float attenuationChange = fwidth(shadowAttenuation) * 0.5;
float shadow = smoothstep(0.5 - attenuationChange, 0.5 + attenuationChange, shadowAttenuation);
#else
//for other light types (point, spot), put the cutoff near black, so the falloff doesn't affect the range
float attenuationChange = fwidth(shadowAttenuation);
float shadow = smoothstep(0, attenuationChange, shadowAttenuation);
#endif
lightIntensity = lightIntensity * shadow;
//calculate how much the surface points points towards the reflection direction
float3 reflectionDirection = reflect(lightDir, s.Normal);
float towardsReflection = dot(viewDir, -reflectionDirection);
//make specular highlight all off towards outside of model
float specularFalloff = dot(viewDir, s.Normal);
specularFalloff = pow(specularFalloff, _SpecularFalloff);
towardsReflection = towardsReflection * specularFalloff;
//make specular intensity with a hard corner
float specularChange = fwidth(towardsReflection);
float specularIntensity = smoothstep(1 - _SpecularSize, 1 - _SpecularSize + specularChange, towardsReflection);
//factor inshadows
specularIntensity = specularIntensity * shadow;
float4 color;
//calculate final color
color.rgb = s.Albedo * lightIntensity * _LightColor0.rgb;
color.rgb = lerp(color.rgb, s.Specular * _LightColor0.rgb, saturate(specularIntensity));
color.a = s.Alpha;
return color;
}
//input struct which is automatically filled by unity
struct Input {
float2 uv_MainTex;
};
//the surface shader function which sets parameters the lighting function then uses
void surf (Input i, inout ToonSurfaceOutput o) {
//sample and tint albedo texture
fixed4 col = tex2D(_MainTex, i.uv_MainTex);
col *= _Color;
o.Albedo = col.rgb;
o.Specular = _Specular;
float3 shadowColor = col.rgb * _ShadowTint;
o.Emission = _Emission + shadowColor;
}
ENDCG
}
FallBack "Standard"
}