Shader Wanted: Diffuse, Normal, Spec, Emmission and Alpha

Shockwolf · Mar 2014

Hi folks,

I have no idea what Im doing with shaders or tools like strumpy for that matter (And believe me Ive tried) and I have created a character that Im working on setting up as a 3rd person Player Character in Unity, that I need a specific type of shader for.

So I was wondering if anyone has or can make me a Unity Shader that supports Diffuse maps, Normal maps, Spec maps, Emmision maps and Alpha channels/cutoff that I can please pilfer?

Cheers.

SW

electricsauce · Mar 2014

Try this out:

alpha cutoff references the main texture alpha, emission is packed in the normal map alpha

Shader "Custom/PC_ASlphaEmissive" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 0)
_Shininess ("Shininess", Range (0.01, 1)) = 0.078125
_MainTex ("Base (RGB) TransGloss (A)", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5

_EmissionLM ("Emission (Lightmapper)", Float) = 0
_EAmount ("Emission Amount", Float) = 0
_EColor ("Emission Color", Color) = (1,1,1,1)
}

SubShader {
Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
LOD 400

CGPROGRAM
#pragma surface surf BlinnPhong alphatest:_Cutoff
#pragma exclude_renderers flash

sampler2D _MainTex;
sampler2D _BumpMap;
fixed4 _Color;
half _Shininess;

float _EAmount;
fixed4 _EColor;

struct Input {
float2 uv_MainTex;
float2 uv_BumpMap;
};

void surf (Input IN, inout SurfaceOutput o) {
fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
o.Albedo = tex * _Color;
o.Emission = tex.rgb * tex2D(_BumpMap, IN.uv_BumpMap).a * _EAmount * _EColor;
o.Gloss = tex.a;
o.Alpha = tex.a * _Color.a;
o.Specular = _Shininess;
o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
}
ENDCG
}

FallBack "Transparent/Cutout/VertexLit"
}

Shockwolf · Mar 2014

Cheers electricsauce,

This is good, but ideally I need slots to place my specmap and emmisive map in too.

Edit: Also placing a texture into the Alpha channel of the Normal map, does not seem to make any difference.

Thanks.

SW

Farfarer · Mar 2014

The normal map compression that Unity uses will wipe it's alpha channel (and it's blue channel). You shouldn't put anything in there you want to use unless you compress/decompress it yourself.

electricsauce · Mar 2014

Farfarer wrote: »

The normal map compression that Unity uses will wipe it's alpha channel (and it's blue channel). You shouldn't put anything in there you want to use unless you compress/decompress it yourself.

That's good to know. I guess we need at least one more texture lookup.

Shockwolf · Apr 2014

I've managed to wing an adaption of the above script, which impliments the emissive feature I'm after and it works nicely, but alas I cannot work out how to add in a Specmap feature to this without breaking it.

Shader "Custom/PC_ASlphaEmissive" {
Properties {
_Color ("Main Color", Color) = (1,1,1,1)
_SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 0)
_Shininess ("Shininess", Range (0.01, 1)) = 0.078125
_MainTex ("Base (RGB) TransGloss (A)", 2D) = "white" {}
_BumpMap ("Normalmap", 2D) = "bump" {}
_Cutoff ("Alpha cutoff", Range(0,1)) = 0.5

_EmissionRange("_EmissionRange", Range(0,10) ) = 0.91
_Emission("_Emission", 2D) = "black" {}
}

SubShader {
Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
LOD 400

CGPROGRAM
#pragma surface surf BlinnPhong alphatest:_Cutoff
#pragma exclude_renderers flash

sampler2D _MainTex;
sampler2D _BumpMap;
fixed4 _Color;
half _Shininess;

float _EmissionRange;
sampler2D _Emission;
half3 Emission;

struct Input {
float2 uv_MainTex;
float2 uv_BumpMap;
float2 uv_Emission;
};

void surf (Input IN, inout SurfaceOutput o) {
fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
o.Albedo = tex * _Color;
o.Emission = 0.0;
o.Gloss = tex.a;
o.Alpha = tex.a * _Color.a;
o.Specular = _Shininess;
o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));

float4 Tex2D2=tex2D(_Emission,(IN.uv_Emission.xyxy).xy);
float4 Multiply2=_EmissionRange.xxxx * Tex2D2;

o.Emission = Multiply2;

}
ENDCG
}

FallBack "Transparent/Cutout/VertexLit"
}

Shockwolf · Nov 2014

Further to this I found out its possible to place more than one material on a mesh with Unity. Just by simply increasing the "Size" of the materials under the mesh renderer inpsector, you can then add more materials and play around with the order until you get the desired result. So I added the Specmap material I needed over the other material and that pretty much solved it.

passerby · Nov 2014

Be aware that multi materials mean multiple draw calls

Shader Wanted: Diffuse, Normal, Spec, Emmission and Alpha

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