121 lines
3.7 KiB
Plaintext
121 lines
3.7 KiB
Plaintext
Shader "IndianOcean/PortalVortex"
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{
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// 传送门旋涡 Shader
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// 顺时针旋转 + 中心扭曲 + 发光效果
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// 基于 URP 管线
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Properties
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{
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_MainTex ("主贴图", 2D) = "white" {}
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_RotationSpeed ("旋转速度", Range(-5.0, 5.0)) = 1.5
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_VortexStrength ("扭曲强度", Range(0.0, 3.0)) = 1.0
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_CenterGlow ("中心发光强度", Range(0.0, 3.0)) = 1.5
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_Color ("色调", Color) = (1.0, 1.0, 1.0, 1.0)
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}
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SubShader
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{
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Tags
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{
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"RenderType" = "Transparent"
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"Queue" = "Transparent"
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"RenderPipeline" = "UniversalPipeline"
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}
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Blend SrcAlpha OneMinusSrcAlpha
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ZWrite Off
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ZTest LEqual
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Cull Off
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Pass
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{
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Name "PortalVortex"
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HLSLPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionOS : POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float2 uv : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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CBUFFER_START(UnityPerMaterial)
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float4 _MainTex_ST;
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float _RotationSpeed;
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float _VortexStrength;
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float _CenterGlow;
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float4 _Color;
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CBUFFER_END
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TEXTURE2D(_MainTex);
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SAMPLER(sampler_MainTex);
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Varyings vert(Attributes input)
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{
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Varyings output;
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UNITY_SETUP_INSTANCE_ID(input);
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UNITY_TRANSFER_INSTANCE_ID(input, output);
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output.positionCS = TransformObjectToHClip(input.positionOS.xyz);
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output.uv = TRANSFORM_TEX(input.uv, _MainTex);
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return output;
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}
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half4 frag(Varyings input) : SV_Target
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{
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// UV 中心点
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float2 center = float2(0.5, 0.5);
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float2 uvOffset = input.uv - center;
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// 极坐标：距离和角度
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float dist = length(uvOffset);
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float angle = atan2(uvOffset.y, uvOffset.x);
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// 顺时针旋转：角度减去时间 * 速度
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float rotation = _Time.y * _RotationSpeed;
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// 扭曲强度随距离减小（中心扭曲更大）
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float twist = _VortexStrength * (1.0 - dist * 2.0);
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twist = max(twist, 0.0);
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// 应用旋转 + 扭曲
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float finalAngle = angle - rotation - twist * 3.14159;
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// 转换回 UV 坐标
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float2 vortexUV = center + float2(
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cos(finalAngle) * dist,
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sin(finalAngle) * dist
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);
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// 采样主贴图
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half4 texColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, vortexUV);
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// 中心发光：距离中心越近越亮
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float glow = _CenterGlow * (1.0 - dist * 2.0);
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glow = max(glow, 0.0);
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// 边缘柔和过渡
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float edgeFade = 1.0 - smoothstep(0.35, 0.5, dist);
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// 最终颜色 = 贴图色 + 中心发光 * 蓝色调
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float3 glowColor = float3(0.2, 0.6, 1.0) * glow;
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float3 finalColor = texColor.rgb * _Color.rgb + glowColor;
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float alpha = texColor.a * edgeFade;
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return half4(finalColor, alpha);
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}
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ENDHLSL
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}
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}
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FallBack Off
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}
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