练习贴

c#代码

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;public class TestInputPosShader : MonoBehaviour
{public Material material;const int arrayCount= 2000;Vector4[] list = new Vector4[arrayCount];private int tempIndex;private void Update(){if (Input.GetMouseButton(0)){RaycastHit hit;Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);if (Physics.Raycast(ray, out hit, 1000)){// Debug.Log("Raycast hit: " + hit.point);list[tempIndex]= hit.point;material.SetVectorArray("_InputPoints", list);material.SetInt("_InputPointCount", tempIndex+1);tempIndex++;if (tempIndex>= arrayCount){tempIndex = 0;}}}}}

shader代码

Shader "Custom/MousePointSetColor"
{Properties{_MainTex ("Texture", 2D) = "white" {} //主纹理_Radius("Radius",float) = 1 //影响半径_Intensity("Intensity",float) = 1 //影响的强度_PointColor ("PointColor", Color) = (1,1,1,1) //选中颜色}SubShader{Tags{"Queue"="Transparent"}Blend SrcAlpha OneMinusSrcAlphaLOD 100Pass{CGPROGRAM#pragma vertex vert#pragma fragment frag// make fog work#pragma multi_compile_fog#include "UnityCG.cginc"half _Alpha;float _Radius;//影响半径float _Intensity;//影响的强度uniform int _InputPointCount;uniform float4 _InputPoints[2000];float4 _PointColor;struct appdata{float4 vertex : POSITION;float2 uv : TEXCOORD0;};struct v2f{float2 uv : TEXCOORD0;fixed3 worldPos : TEXCOORD1;UNITY_FOG_COORDS(1)float4 vertex : SV_POSITION;};sampler2D _MainTex;float4 _MainTex_ST;half calculateIntensity(fixed3 worldPos,float4 inputPos,float radius,float intensity){half dis = distance(worldPos,inputPos.xyz);//计算输入点和每个顶点的距离half ratio = 1-saturate(dis/radius);//saturate 返0~1，计算强度百分比，距离目标点越远影响强度越小half heat = intensity*ratio;return heat;}v2f vert (appdata v){v2f o;o.vertex = UnityObjectToClipPos(v.vertex);o.uv = TRANSFORM_TEX(v.uv, _MainTex);UNITY_TRANSFER_FOG(o,o.vertex);float3 worldPos = mul(unity_ObjectToWorld,v.vertex).xyz;//获取每一个顶点信息o.worldPos = worldPos;return o;}fixed4 frag (v2f i) : SV_Target{// sample the texturefixed4 col = tex2D(_MainTex, i.uv);// apply fogUNITY_APPLY_FOG(i.fogCoord, col);half value = 0;for( int j = 0 ; j < _InputPointCount;j++ ){//计算顶点世界坐标和传入的世界坐标点的影响范围返回值value+=calculateIntensity(i.worldPos,_InputPoints[j],_Radius,_Intensity);value=clamp(value,0,1);}float rate =1- step(0.01,value);col= (col*rate)+ (_PointColor*float4(value,value,value,_PointColor.w));return col;}ENDCG}}
}

效果图