104 lines
4.0 KiB
Plaintext
104 lines
4.0 KiB
Plaintext
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Shader "Custom/ImprovedPseudoShadow" {
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Properties {
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[Header(Base)]
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_MainTex ("Texture", 2D) = "white" {}
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_Color ("Main Color", Color) = (1,1,1,1)
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[Header(Shadow)]
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_ShadowColor ("Shadow Color", Color) = (0.2, 0.2, 0.3, 1) // 默认偏蓝的阴影
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_ShadowThreshold ("Shadow Threshold", Range(-1,1)) = 0.0
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_ShadowSmoothness ("Shadow Smoothness", Range(0,1)) = 0.1
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[Header(Lighting Mode)]
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_UseWorldLight ("Use Fixed World Light?", Range(0,1)) = 0
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_FakeLightDir ("Fake Light Dir (XYZ)", Vector) = (0.5, 1, 0.5, 0) // 模拟从右上方来的光
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}
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SubShader {
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Tags { "RenderType"="Transparent" }
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LOD 100
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Pass {
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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// 开启 GPU Instancing 支持
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#pragma multi_compile_instancing
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#include "UnityCG.cginc"
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struct appdata {
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float4 vertex : POSITION;
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float3 normal : NORMAL;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID // Instancing ID
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};
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struct v2f {
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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float lightFactor : TEXCOORD1; // 传递光照因子
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UNITY_VERTEX_INPUT_INSTANCE_ID // Instancing ID
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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// 声明 Instancing 属性变量
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UNITY_INSTANCING_BUFFER_START(Props)
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UNITY_DEFINE_INSTANCED_PROP(fixed4, _Color)
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UNITY_DEFINE_INSTANCED_PROP(fixed4, _ShadowColor)
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UNITY_DEFINE_INSTANCED_PROP(float4, _FakeLightDir)
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UNITY_DEFINE_INSTANCED_PROP(float, _ShadowThreshold)
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UNITY_DEFINE_INSTANCED_PROP(float, _ShadowSmoothness)
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UNITY_DEFINE_INSTANCED_PROP(float, _UseWorldLight)
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UNITY_INSTANCING_BUFFER_END(Props)
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v2f vert (appdata v) {
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v2f o;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_TRANSFER_INSTANCE_ID(o, v);
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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float3 normalWorld = UnityObjectToWorldNormal(v.normal);
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float3 lightDir;
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float useWorldLight = UNITY_ACCESS_INSTANCED_PROP(Props, _UseWorldLight);
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float3 fakeDir = normalize(UNITY_ACCESS_INSTANCED_PROP(Props, _FakeLightDir).xyz);
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float3 viewDir = normalize(WorldSpaceViewDir(v.vertex));
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// 用lerp实现分支
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lightDir = normalize(lerp(viewDir, fakeDir, useWorldLight));
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float dotProduct = dot(normalWorld, lightDir);
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o.lightFactor = dotProduct;
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return o;
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}
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fixed4 frag (v2f i) : SV_Target {
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UNITY_SETUP_INSTANCE_ID(i);
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// 获取属性
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fixed4 mainColor = UNITY_ACCESS_INSTANCED_PROP(Props, _Color);
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fixed4 shadowColor = UNITY_ACCESS_INSTANCED_PROP(Props, _ShadowColor);
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float threshold = UNITY_ACCESS_INSTANCED_PROP(Props, _ShadowThreshold);
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float smoothness = UNITY_ACCESS_INSTANCED_PROP(Props, _ShadowSmoothness);
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fixed4 texCol = tex2D(_MainTex, i.uv) * mainColor;
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// 改进2：更平滑且可控的阈值计算 (Smoothstep)
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// lightFactor 越大说明越直接面对光源
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float lightIntensity = smoothstep(threshold, threshold + smoothness, i.lightFactor);
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// 改进3：基于光照强度的颜色插值 (Lerp)
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// 0 (背光) -> ShadowColor
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// 1 (受光) -> Texture Color
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fixed3 finalRGB = lerp(shadowColor.rgb * texCol.rgb, texCol.rgb, lightIntensity);
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return fixed4(finalRGB, texCol.a);
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}
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ENDCG
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}
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}
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FallBack "VertexLit"
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}
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