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two sided material

Mayalicious
Mayalicious
polycounter lvl 8
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Mayalicious polycounter lvl 8
I have an one sided mesh. When i import this into unity i can only see one side. It doesnt render two sided. Is there a two sided material that i can use? Thank you.
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  • ZacD
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    ZacD ngon master
    Unless you need the whole model to be double-sided, it's much cheaper performance wise just to duplicate and invert the polygons you need double-sided.
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  • Yedp
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    Yedp polycounter lvl 7
    Like ZacD said it is better to duplicate the mesh and reverse the normals performance-wise. If you need it for things that are transparent such as hairs you could always use a Cutout Soft Edge Unlit material, they show on both sides.
    If you really need to get a 2 sided shader, there are some around on forums around the net or blogs, and on the wiki I think.

    here's one with different material color and specular for each side:
    http://en.wikibooks.org/wiki/Cg_Programming/Unity/Two-Sided_Surfaces

    If you need a transparent Soft Edge Unlit Double sided with shadows you can use that one, sorry I can't remember the source so I'll just past his/her code here:
    Shader "Transparent/Cutout/Soft Edge Lit Double Sided" {
    Properties {
    _Color ("Main Color", Color) = (1,1,1,1)
    _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
    _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
    }

    SubShader {
    Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
    LOD 200
    Cull Off

    // render the semitransparent details.
    Pass {

    // Dont write to the depth buffer

    Name "FORWARD"
    Tags { "LightMode" = "ForwardBase" }
    Blend SrcAlpha OneMinusSrcAlpha
    ZWrite off

    CGPROGRAM
    #pragma vertex vert_surf
    #pragma fragment frag_surf
    #pragma fragmentoption ARB_precision_hint_fastest
    #pragma multi_compile_fwdbasealpha
    #include "HLSLSupport.cginc"
    #include "UnityShaderVariables.cginc"
    #define UNITY_PASS_FORWARDBASE
    #include "UnityCG.cginc"
    #include "Lighting.cginc"
    #include "AutoLight.cginc"

    #define INTERNAL_DATA
    #define WorldReflectionVector(data,normal) data.worldRefl
    #define WorldNormalVector(data,normal) normal
    #line 1
    #line 12


    sampler2D _MainTex;
    fixed4 _Color;

    struct Input {
    float2 uv_MainTex;
    };

    void surf (Input IN, inout SurfaceOutput o) {
    fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
    o.Albedo = c.rgb;
    o.Alpha = c.a;
    }
    #ifdef LIGHTMAP_OFF
    struct v2f_surf {
    float4 pos : SV_POSITION;
    float2 pack0 : TEXCOORD0;
    fixed3 normal : TEXCOORD1;
    fixed3 vlight : TEXCOORD2;
    LIGHTING_COORDS(3,4)
    };
    #endif
    #ifndef LIGHTMAP_OFF
    struct v2f_surf {
    float4 pos : SV_POSITION;
    float2 pack0 : TEXCOORD0;
    float2 lmap : TEXCOORD1;
    LIGHTING_COORDS(2,3)
    };
    #endif
    #ifndef LIGHTMAP_OFF
    float4 unity_LightmapST;
    #endif
    float4 _MainTex_ST;
    v2f_surf vert_surf (appdata_full v) {
    v2f_surf o;
    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
    o.pack0.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
    #ifndef LIGHTMAP_OFF
    o.lmap.xy = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
    #endif
    float3 worldN = mul((float3x3)_Object2World, SCALED_NORMAL);
    #ifdef LIGHTMAP_OFF
    o.normal = worldN;
    #endif
    #ifdef LIGHTMAP_OFF
    float3 shlight = ShadeSH9 (float4(worldN,1.0));
    o.vlight = shlight;
    #ifdef VERTEXLIGHT_ON
    float3 worldPos = mul(_Object2World, v.vertex).xyz;
    o.vlight += Shade4PointLights (
    unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0,
    unity_LightColor[0].rgb, unity_LightColor[1].rgb, unity_LightColor[2].rgb, unity_LightColor[3].rgb,
    unity_4LightAtten0, worldPos, worldN );
    #endif // VERTEXLIGHT_ON
    #endif // LIGHTMAP_OFF
    TRANSFER_VERTEX_TO_FRAGMENT(o);
    return o;
    }
    #ifndef LIGHTMAP_OFF
    sampler2D unity_Lightmap;
    #ifndef DIRLIGHTMAP_OFF
    sampler2D unity_LightmapInd;
    #endif
    #endif
    fixed4 frag_surf (v2f_surf IN) : COLOR {
    Input surfIN;
    surfIN.uv_MainTex = IN.pack0.xy;
    #ifdef UNITY_COMPILER_HLSL
    SurfaceOutput o = (SurfaceOutput)0;
    #else
    SurfaceOutput o;
    #endif
    o.Albedo = 0.0;
    o.Emission = 0.0;
    o.Specular = 0.0;
    o.Alpha = 0.0;
    o.Gloss = 0.0;
    #ifdef LIGHTMAP_OFF
    o.Normal = IN.normal;
    #endif
    surf (surfIN, o);
    fixed atten = LIGHT_ATTENUATION(IN);
    fixed4 c = 0;
    #ifdef LIGHTMAP_OFF
    c = LightingLambert (o, _WorldSpaceLightPos0.xyz, atten);
    #endif // LIGHTMAP_OFF
    #ifdef LIGHTMAP_OFF
    c.rgb += o.Albedo * IN.vlight;
    #endif // LIGHTMAP_OFF
    #ifndef LIGHTMAP_OFF
    #ifdef DIRLIGHTMAP_OFF
    fixed4 lmtex = tex2D(unity_Lightmap, IN.lmap.xy);
    fixed3 lm = DecodeLightmap (lmtex);
    #else
    fixed4 lmtex = tex2D(unity_Lightmap, IN.lmap.xy);
    fixed4 lmIndTex = tex2D(unity_LightmapInd, IN.lmap.xy);
    half3 lm = LightingLambert_DirLightmap(o, lmtex, lmIndTex, 0).rgb;
    #endif
    #ifdef SHADOWS_SCREEN
    #if defined(SHADER_API_GLES) && defined(SHADER_API_MOBILE)
    c.rgb += o.Albedo * min(lm, atten*2);
    #else
    c.rgb += o.Albedo * max(min(lm,(atten*2)*lmtex.rgb), lm*atten);
    #endif
    #else // SHADOWS_SCREEN
    c.rgb += o.Albedo * lm;
    #endif // SHADOWS_SCREEN
    c.a = o.Alpha;
    #endif // LIGHTMAP_OFF
    c.a = o.Alpha;
    return c;
    }

    ENDCG
    }
    Pass {
    Name "FORWARD"
    Tags { "LightMode" = "ForwardBase" }
    ColorMask RGB
    CGPROGRAM
    #pragma vertex vert_surf
    #pragma fragment frag_surf
    #pragma fragmentoption ARB_precision_hint_fastest
    #pragma multi_compile_fwdbase
    #include "HLSLSupport.cginc"
    #include "UnityShaderVariables.cginc"
    #define UNITY_PASS_FORWARDBASE
    #include "UnityCG.cginc"
    #include "Lighting.cginc"
    #include "AutoLight.cginc"

    #define INTERNAL_DATA
    #define WorldReflectionVector(data,normal) data.worldRefl
    #define WorldNormalVector(data,normal) normal
    #line 1
    #line 65

    sampler2D _MainTex;
    fixed4 _Color;

    struct Input {
    float2 uv_MainTex;
    };

    void surf (Input IN, inout SurfaceOutput o) {
    fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
    o.Albedo = c.rgb;
    o.Alpha = c.a;
    }
    #ifdef LIGHTMAP_OFF
    struct v2f_surf {
    float4 pos : SV_POSITION;
    float2 pack0 : TEXCOORD0;
    fixed3 normal : TEXCOORD1;
    fixed3 vlight : TEXCOORD2;
    LIGHTING_COORDS(3,4)
    };
    #endif
    #ifndef LIGHTMAP_OFF
    struct v2f_surf {
    float4 pos : SV_POSITION;
    float2 pack0 : TEXCOORD0;
    float2 lmap : TEXCOORD1;
    LIGHTING_COORDS(2,3)
    };
    #endif
    #ifndef LIGHTMAP_OFF
    float4 unity_LightmapST;
    #endif
    float4 _MainTex_ST;
    v2f_surf vert_surf (appdata_full v) {
    v2f_surf o;
    o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
    o.pack0.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
    #ifndef LIGHTMAP_OFF
    o.lmap.xy = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
    #endif
    float3 worldN = mul((float3x3)_Object2World, SCALED_NORMAL);
    #ifdef LIGHTMAP_OFF
    o.normal = worldN;
    #endif
    #ifdef LIGHTMAP_OFF
    float3 shlight = ShadeSH9 (float4(worldN,1.0));
    o.vlight = shlight;
    #ifdef VERTEXLIGHT_ON
    float3 worldPos = mul(_Object2World, v.vertex).xyz;
    o.vlight += Shade4PointLights (
    unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0,
    unity_LightColor[0].rgb, unity_LightColor[1].rgb, unity_LightColor[2].rgb, unity_LightColor[3].rgb,
    unity_4LightAtten0, worldPos, worldN );
    #endif // VERTEXLIGHT_ON
    #endif // LIGHTMAP_OFF
    TRANSFER_VERTEX_TO_FRAGMENT(o);
    return o;
    }
    #ifndef LIGHTMAP_OFF
    sampler2D unity_Lightmap;
    #ifndef DIRLIGHTMAP_OFF
    sampler2D unity_LightmapInd;
    #endif
    #endif
    fixed _Cutoff;
    fixed4 frag_surf (v2f_surf IN) : COLOR {
    Input surfIN;
    surfIN.uv_MainTex = IN.pack0.xy;
    #ifdef UNITY_COMPILER_HLSL
    SurfaceOutput o = (SurfaceOutput)0;
    #else
    SurfaceOutput o;
    #endif
    o.Albedo = 0.0;
    o.Emission = 0.0;
    o.Specular = 0.0;
    o.Alpha = 0.0;
    o.Gloss = 0.0;
    #ifdef LIGHTMAP_OFF
    o.Normal = IN.normal;
    #endif
    surf (surfIN, o);
    clip (o.Alpha - _Cutoff);
    fixed atten = LIGHT_ATTENUATION(IN);
    fixed4 c = 0;
    #ifdef LIGHTMAP_OFF
    c = LightingLambert (o, _WorldSpaceLightPos0.xyz, atten);
    #endif // LIGHTMAP_OFF
    #ifdef LIGHTMAP_OFF
    c.rgb += o.Albedo * IN.vlight;
    #endif // LIGHTMAP_OFF
    #ifndef LIGHTMAP_OFF
    #ifdef DIRLIGHTMAP_OFF
    fixed4 lmtex = tex2D(unity_Lightmap, IN.lmap.xy);
    fixed3 lm = DecodeLightmap (lmtex);
    #else
    fixed4 lmtex = tex2D(unity_Lightmap, IN.lmap.xy);
    fixed4 lmIndTex = tex2D(unity_LightmapInd, IN.lmap.xy);
    half3 lm = LightingLambert_DirLightmap(o, lmtex, lmIndTex, 0).rgb;
    #endif
    #ifdef SHADOWS_SCREEN
    #if defined(SHADER_API_GLES) && defined(SHADER_API_MOBILE)
    c.rgb += o.Albedo * min(lm, atten*2);
    #else
    c.rgb += o.Albedo * max(min(lm,(atten*2)*lmtex.rgb), lm*atten);
    #endif
    #else // SHADOWS_SCREEN
    c.rgb += o.Albedo * lm;
    #endif // SHADOWS_SCREEN
    c.a = o.Alpha;
    #endif // LIGHTMAP_OFF
    c.a = o.Alpha;
    return c;
    }

    ENDCG
    }
    }
    Fallback "Transparent/Cutout/VertexLit"
    }

    Hope this help, good luck!
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