struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
                float4 worldPos : TEXCOORD1;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float4x4 _TransformMatrix;
            float4 _CubePos;

            v2f vert(appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                UNITY_TRANSFER_FOG(o,o.vertex);
                //uv座標をワールド座標に変換
                o.worldPos = mul(_TransformMatrix, float4(-(v.uv.x - 0.5) * 10, 0, -(v.uv.y - 0.5) * 10, 1));
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                UNITY_APPLY_FOG(i.fogCoord, col);
                //ヒートマップの効果範囲(仮置き)
                float maxDia = 0.5;
                //マッピングするための重み
                //1.5秒で赤くなるように135で割る(fps:90)
                float probability = (clamp(maxDia - distance(i.worldPos, _CubePos), 0, maxDia)) / 135;
                //hsvに変換
                float3 hsv = rgb2hsv(float3(col.r, col.g, col.b));
                //1frame前のヒートマップに重畳
                float h = hsv.y == 0 ? 0.66 - probability : hsv.x - probability < 0 ? 0 : hsv.x - probability;
                //効果範囲内なら色を変える
                return maxDia> distance(i.worldPos, _CubePos) ? float4(hsv2rgb(float3(h, 1, 1)), 1) : col;
            }

    public Material iniMat;
    public Material paintMat;
    public Transform gazePoint;

    Material mainMaterial;
    RenderTexture mainTex;
    void Start()
    {
        mainTex = new RenderTexture(770, 1000, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Default);
        Graphics.Blit(mainTex, mainTex, iniMat);

        mainMaterial = GetComponent<Renderer>().material;
        mainMaterial.SetTexture("_MainTex", mainTex);
    }
    void FixedUpdate()
    {
        //bufferを作成
        RenderTexture buf = RenderTexture.GetTemporary(770, 1000); ;
        //paintMatを更新
        MatUpdate();
        //mainTexとpaintMatを使ってbufferに描画
        Graphics.Blit(mainTex, buf, paintMat);
        //bufferの内容をmainTexに上書き
        Graphics.Blit(buf, mainTex);

        RenderTexture.ReleaseTemporary(buf);
    }
    void MatUpdate()
    {
        paintMat.SetVector("_CubePos", new Vector4(gazePoint.position.x, gazePoint.position.y, gazePoint.position.z, 1));
        paintMat.SetTexture("_MainTex", mainTex);
        paintMat.SetMatrix("_TransformMatrix", transform.localToWorldMatrix);
    }

            fixed4 frag(v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                UNITY_APPLY_FOG(i.fogCoord, col);
                //対象ピクセルの角度を計算
                //180÷3.1415 = 57.297を使ってラジアンを度数法に変換
                float angle = atan2(distance(i.worldPos, _CubePos), distance(i.worldPos, _GazeOri)) * 57.297;
                //正規分布を使って中心に重みづけする。
                float probability = exp(-0.6931 * angle * angle)/135;
                float3 hsv = rgb2hsv(float3(col.r, col.g, col.b));
                float h = hsv.y == 0 ? 0.66 - probability : hsv.x - probability < 0 ? 0 : hsv.x - probability;
                //視野範囲内ならマッピングをする
                return angle < 2.5 ? float4(hsv2rgb(float3(h, 1, 1)), 1) : col;
            }

    public Transform gazeOrigin;
    void MatUpdate()
    {
        paintMat.SetVector("_CubePos", new Vector4(gazePoint.position.x, gazePoint.position.y, gazePoint.position.z, 1));
        //追加
        paintMat.SetVector("_GazeOri", new Vector4(gazeOrigin.position.x, gazeOrigin.position.y, gazeOrigin.position.z, 1));
        paintMat.SetTexture("_MainTex", mainTex);
        paintMat.SetMatrix("_TransformMatrix", transform.localToWorldMatrix);
    }