僕の説明書おきばwiki

//0をまたぐ場合の判定
if ((Target < Min) || (Max < Target)) return true;
        return false;
//通常の判定
if ((Max < Target) && (Target < Min)) return true;
        return false;

 public bool IsRange(float Target, float Min, float Max)
    {
        if(Max > Min)return IsRange_0Stride(Target, Min, Max);

        if ((Max < Target) && (Target < Min)) return true;
        return false;
    }

public bool IsRange_0Stride(float Target, float Min, float Max)
    {
        if ((Target < Min) || (Max < Target)) return true;
        return false;
    }

public void RestrictedSpin(Vector3 Angle, Vector3 Vec3Min, Vector3 Vec3Max, Space Type)
    {
        //座標と移動を加算した値
        Vector3 Result = transform.localEulerAngles + Angle;

        if (IsRange(Result.x, Vec3Min.x, Vec3Max.x) == true)
        {
            transform.Rotate(Angle.x, 0, 0, Type);
        }

        if (IsRange(Result.y, Vec3Min.y, Vec3Max.y) == true)
        {
            transform.Rotate(0, Angle.y, 0, Type);
        }

        if (IsRange(Result.z, Vec3Min.z, Vec3Max.z) == true)
        {
            transform.Rotate(0, 0, Angle.z, Type);
        }
    }