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效果图片

靠近墙壁

远离墙壁
材质球的设置

两张图片

使用方式
把这个脚本放到墙上，将player赋值给"_player"，然后运行，用户靠近就会根据距离显示光墙。

using UnityEngine;public class NewBehaviourScript : MonoBehaviour
{private Material _mat;public GameObject _player;private void Start(){_mat = gameObject.GetComponent<MeshRenderer>().materials[0];Debug.Log(_player.transform.position);}private void Update(){_mat.SetVector("_PlayerPos", _player.transform.position);}
}

shader代码

Shader "Unlit/NewUnlitShader"
{Properties{_MainTex ("Texture", 2D) = "white" {}
_MulTex ("MulTex",2D)="White" {}_Color ("Color",Vector)=(1,1,1,0)_PlayerPos("PlayerPos",Vector)=(1,1,1,0)_EdgeRange("EdgeRange",Vector)=(2,6,0,0)
_uvSpeed("uvSpeed",vector)=(1,0,0,0)}SubShader{Tags { "RenderType"="Transparent" "Queue"="Transparent" }Blend  SrcAlpha OneMinusSrcAlphaPass{CGPROGRAM#pragma vertex vert#pragma fragment frag#include "UnityCG.cginc"struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;float2 uv2:TEXCOORD2;};struct v2f{float2 uv : TEXCOORD0;
float2 uv2:TEXCOORD2;float4 vertex : SV_POSITION;float4 vertexWorldPos : TEXCOORD1;};sampler2D _MainTex;sampler2D _MulTex;float4 _MainTex_ST;float4 _MulTex_ST;float4 _PlayerPos;float4 _EdgeRange;
float4 _uvSpeed;
float4 _Color;v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(v.vertex);o.uv = TRANSFORM_TEX(v.uv, _MainTex);o.uv2 = TRANSFORM_TEX(v.uv2, _MulTex);
o.uv2+=_Time.x*_uvSpeed;o.vertexWorldPos= mul(unity_ObjectToWorld,v.vertex);return o;}fixed4 frag (v2f i) : SV_Target{
float dis=abs(distance(i.vertexWorldPos,_PlayerPos));
float4 tex=tex2D(_MainTex,i.uv);
float4 tex2=tex2D(_MulTex,i.uv2);
float4 color1=_Color;tex.a*= 1 - smoothstep(_EdgeRange.x,_EdgeRange.y,dis);fixed4 col = tex2D(_MainTex, i.uv);return tex*color1*tex2;}ENDCG}}
}

教程URL