重写地面物品shader 和 摆放工具

unity/Assets/Light/shaders/SpriteWithGroundClip.shader

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+Shader "Custom/SpriteWithGroundClip"
+{
+    // 带地面裁剪的Sprite Shader
+    // 当Sprite的世界Y坐标低于地面高度时，会被裁剪掉
+    Properties
+    {
+        _MainTex ("Texture", 2D) = "white" {}
+        _GroundHeight ("地面高度 (Y坐标)", Float) = 0.0
+        [MaterialToggle] _EnableClip ("启用裁剪", Float) = 1.0
+        _ClipSoftness ("裁剪边缘柔和度", Range(0, 0.5)) = 0.05
+        
+        // 颜色
+        _Color ("颜色", Color) = (1, 1, 1, 1)
+    }
+    SubShader
+    {
+        Tags
+        {
+            "RenderPipeline" = "UniversalPipeline"
+            "Queue" = "Transparent"
+            "RenderType" = "Transparent"
+        }
+        
+        Blend SrcAlpha OneMinusSrcAlpha
+        ZWrite Off
+        Cull Off
+
+        Pass
+        {
+            Name "SpriteWithGroundClip"
+            
+            HLSLPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #pragma multi_compile_instancing
+
+            #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
+
+            struct Attributes
+            {
+                float4 positionOS : POSITION;
+                float2 uv : TEXCOORD0;
+                float4 color : COLOR;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct Varyings
+            {
+                float4 positionCS : SV_POSITION;
+                float2 uv : TEXCOORD0;
+                float4 color : COLOR;
+                float3 worldPos : TEXCOORD1;
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            CBUFFER_START(UnityPerMaterial)
+                float4 _MainTex_ST;
+                float4 _Color;
+                float _GroundHeight;
+                float _EnableClip;
+                float _ClipSoftness;
+            CBUFFER_END
+
+            TEXTURE2D(_MainTex);
+            SAMPLER(sampler_MainTex);
+
+            Varyings vert(Attributes input)
+            {
+                Varyings output;
+                UNITY_SETUP_INSTANCE_ID(input);
+                UNITY_TRANSFER_INSTANCE_ID(input, output);
+
+                output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
+                output.uv = TRANSFORM_TEX(input.uv, _MainTex);
+                output.color = input.color;
+                output.worldPos = TransformObjectToWorld(input.positionOS.xyz);
+                return output;
+            }
+
+            half4 frag(Varyings input) : SV_Target
+            {
+                UNITY_SETUP_INSTANCE_ID(input);
+
+                // 采样纹理
+                half4 texColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.uv);
+                half4 color = texColor * input.color * _Color;
+
+                // 地面裁剪逻辑
+                if (_EnableClip > 0.5)
+                {
+                    float worldY = input.worldPos.y;
+                    float distanceToGround = worldY - _GroundHeight;
+                    
+                    // 如果在地面以下，裁剪掉
+                    if (distanceToGround < 0)
+                    {
+                        // 使用柔和边缘
+                        float alpha = smoothstep(0, _ClipSoftness, distanceToGround);
+                        color.a *= alpha;
+                        
+                        // 如果Alpha太小，直接丢弃
+                        if (color.a < 0.01)
+                        {
+                            discard;
+                        }
+                    }
+                }
+
+                return color;
+            }
+            ENDHLSL
+        }
+    }
+    FallBack "Sprites/Default"
+}

unity/Assets/Light/shaders/SpriteWithGroundClip.shader.meta

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+fileFormatVersion: 2
+guid: DHIWvH+vAHMOLItts2yT+PO8syjDqTfwMXnuRLkoorGup7Clnw8pcKU=
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: