2026-07-10 노예계약서 서명 기능

Assets/03_Shaders/Paper.shader

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+// 양면 종이 셰이더 (URP)
+// - 양면 렌더링: 얇은 종이 메시(Quad/Plane)의 앞뒤가 모두 보인다
+// - _BaseColor: 앞뒤 공통 종이 색
+// - _FrontTex: 앞면(메시의 노멀 방향 면)에만 표시되는 텍스처(인쇄물). 비우면 앞면도 종이 색 그대로
+// - 하프-램버트 + 앰비언트 조명이라 그늘에서도 새까매지지 않음. 그림자 드리우기 포함
+Shader "DinoLove/Paper"
+{
+    Properties
+    {
+        _BaseColor ("Base Color (양면 종이 색)", Color) = (1, 1, 1, 1)
+        _FrontTex  ("Front Texture (앞면 인쇄물)", 2D) = "white" {}
+    }
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "Queue" = "Geometry" "RenderPipeline" = "UniversalPipeline" }
+
+        // 종이는 얇아서 뒷면도 그린다
+        Cull Off
+
+        Pass
+        {
+            Name "ForwardLit"
+            Tags { "LightMode" = "UniversalForward" }
+
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #pragma multi_compile_instancing
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"
+
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                float3 normalOS   : NORMAL;
+                float2 uv         : TEXCOORD0;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct Varyings
+            {
+                float4 positionCS : SV_POSITION;
+                float2 uv         : TEXCOORD0;
+                float3 normalWS   : TEXCOORD1;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+                UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+            TEXTURE2D(_FrontTex);
+            SAMPLER(sampler_FrontTex);
+
+            CBUFFER_START(UnityPerMaterial)
+                float4 _BaseColor;
+                float4 _FrontTex_ST;
+            CBUFFER_END
+
+            Varyings vert(Attributes input)
+            {
+                Varyings output;
+                UNITY_SETUP_INSTANCE_ID(input);
+                UNITY_TRANSFER_INSTANCE_ID(input, output);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);
+
+                output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
+                output.normalWS   = TransformObjectToWorldNormal(input.normalOS);
+                output.uv         = TRANSFORM_TEX(input.uv, _FrontTex);
+                return output;
+            }
+
+            half4 frag(Varyings input, bool isFrontFace : SV_IsFrontFace) : SV_Target
+            {
+                UNITY_SETUP_INSTANCE_ID(input);
+                UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
+
+                // 양면 공통 종이 색. 앞면에만 텍스처를 곱한다 (기본 white 텍스처 = 종이 색 그대로)
+                half3 albedo = _BaseColor.rgb;
+                if (isFrontFace)
+                    albedo *= SAMPLE_TEXTURE2D(_FrontTex, sampler_FrontTex, input.uv).rgb;
+
+                // 뒷면은 노멀을 뒤집어서 조명 계산
+                float3 normalWS = normalize(input.normalWS);
+                if (!isFrontFace)
+                    normalWS = -normalWS;
+
+                // 하프-램버트 + 앰비언트 — 부드러운 종이 음영
+                Light mainLight = GetMainLight();
+                half ndl = saturate(dot(normalWS, mainLight.direction)) * 0.5h + 0.5h;
+                half3 lighting = mainLight.color * ndl + SampleSH(normalWS);
+
+                return half4(albedo * lighting, 1);
+            }
+            ENDHLSL
+        }
+
+        // 그림자 드리우기 (없으면 종이가 공중에 뜬 것처럼 보임)
+        Pass
+        {
+            Name "ShadowCaster"
+            Tags { "LightMode" = "ShadowCaster" }
+
+            ZWrite On
+            ZTest LEqual
+            ColorMask 0
+            Cull Off
+
+            HLSLPROGRAM
+            #pragma vertex shadowVert
+            #pragma fragment shadowFrag
+            #pragma multi_compile_instancing
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
+
+            float3 _LightDirection;
+
+            struct ShadowAttributes
+            {
+                float4 positionOS : POSITION;
+                float3 normalOS   : NORMAL;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            float4 shadowVert(ShadowAttributes input) : SV_POSITION
+            {
+                UNITY_SETUP_INSTANCE_ID(input);
+
+                float3 positionWS = TransformObjectToWorld(input.positionOS.xyz);
+                float3 normalWS   = TransformObjectToWorldNormal(input.normalOS);
+                float4 positionCS = TransformWorldToHClip(ApplyShadowBias(positionWS, normalWS, _LightDirection));
+
+                #if UNITY_REVERSED_Z
+                    positionCS.z = min(positionCS.z, UNITY_NEAR_CLIP_VALUE);
+                #else
+                    positionCS.z = max(positionCS.z, UNITY_NEAR_CLIP_VALUE);
+                #endif
+                return positionCS;
+            }
+
+            half4 shadowFrag() : SV_Target
+            {
+                return 0;
+            }
+            ENDHLSL
+        }
+    }
+
+    FallBack "Hidden/Universal Render Pipeline/FallbackError"
+}

Assets/03_Shaders/Paper.shader.meta

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+guid: 067a744b9ffb83e4a86f0b424abda8c7
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