Cubemap

using UnityEngine;
using UnityEditor;

public class RenderCubeMap : ScriptableWizard
{
    public Transform renderTrans;
    public Cubemap cubemap;

    [MenuItem("Tools/CreateCubemap")]
    static void CreateCubemap()
    {
        //"Create Cubemap"是打开的窗口名，"Create"是按钮名，点击时调用OnWizardCreate()方法
        ScriptableWizard.DisplayWizard<RenderCubeMap>("Create Cubemap", "Create");//打开向导
    }

    private void OnWizardUpdate()//打开向导或者在向导中更改了其他内容的时候调用
    {
        helpString = "选择渲染位置并且确定需要设置的cubemap";
        isValid = renderTrans != null && cubemap != null;//isValid为true的时候，“Create”按钮才能点击
    }

    private void OnWizardCreate()//点击创建按钮时调用
    {
        GameObject go = new GameObject();
        go.transform.position = renderTrans.position;
        Camera camera = go.AddComponent<Camera>();
        camera.RenderToCubemap(cubemap);//用户提供的Cubemap传递给RenderToCubemap函数，生成六张图片
        DestroyImmediate(go);//立即摧毁go
    }
}

#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"

struct appdata
{
    float4 vertex : POSITION;
    float2 uv : TEXCOORD0;
    float3 normal:NORMAL;
};

struct v2f
{
    float2 uv : TEXCOORD0;
    float4 vertex : SV_POSITION;
    float3 worldPos:TEXCOORD1;
    float3 normal:NORMAL;
};

sampler2D _MainTex;
float4 _MainTex_ST;
samplerCUBE _CubeMap;

v2f vert (appdata v)
{
    v2f o;
    o.vertex = UnityObjectToClipPos(v.vertex);
    o.uv = TRANSFORM_TEX(v.uv, _MainTex);
    o.worldPos = mul(unity_ObjectToWorld,v.vertex);
    o.normal = UnityObjectToWorldNormal(v.normal);
    return o;
}

fixed4 frag (v2f i) : SV_Target
{
    fixed3 V = normalize(i.worldPos - _WorldSpaceCameraPos);
    fixed3 N = i.normal;
    fixed3 R = reflect(V,N);
    //本地CubeMap文件读取
    return texCUBE(_CubeMap,R);
    //Unity反射探针组件Bake文件读取
    fixed4 cubemap = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0,R);
    half3 skyColor = DecodeHDR(cubemap,unity_SpecCube0_HDR);
    return fixed4(skyColor,1);
}