unity让一个物体从上到下消失_Unity Shader模型从上到下消失效果实现

Shader "Unlit/DisappearShader"

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Properties

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_MainTex ("Texture", 2D) = "white" ｛｝

_DisappearOffset ("Disappear Offset",Range(-0.5,0.5)) = 0.5

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SubShader

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Tags ｛ "RenderType"="Opaque" ｝

Pass

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CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata

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float4 vertex : POSITION;

float2 uv : TEXCOORD0;

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struct v2f

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float3 uv : TEXCOORD0;

float4 vertex : SV_POSITION;

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sampler2D _MainTex;

float4 _MainTex_ST;

float _DisappearOffset;

v2f vert (appdata v)

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v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

//输出的uv中xy存储uv值,z存储用于Clip的参数值

o.uv.xy = TRANSFORM_TEX(v.uv, _MainTex);

//因为模型空间中y值范围为(-0.5,0.5)，所以还需要进行偏移以保证裁剪的正确

o.uv.z = _DisappearOffset - v.vertex.y;

return o;

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fi

xed4 frag (v2f i) : SV_Target

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clip(i.uv.z);

// sample the texture

fixed4 col = tex2D(_MainTex, i.uv.xy);

return col;

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ENDCG

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