Cubetube - Its hip to be cube

Update Demo
#define MAX_BRIGHTNESS 55

//how often the cube polls the cheerlights API
#define POLLING_INTERVAL 3000

//this program makes the cube interact with CheerLights -- when your cube is running this, its colors are 
//synchronized with more than 15,000 other IoT devices around the world.  
//You can change the color of your cube and all the other CheerLights by tweeting the name of a color to 
//@CheerLights 
//for example, if you tweet
//    @CheerLights blue
//your cube will immediately turn blue.
//for more detail, check out http://cheerlights.com/about/
void fill(Color col);
Cube cube=Cube();
void setup()
{
	cube.begin();
	cube.background(black);
	Serial.begin(115200);
}

void loop()
{
	String response=getRequest("api.thingspeak.com", "/channels/1417/field/2/last.txt");
    int red, green, blue;

    //if there's a valid hex color string from Cheerlights, update the color
    if(response.length()==7)
    {
    //convert the hex values from the response.body string into byte values
  red=hexToInt(response.charAt(1))*16+hexToInt(response.charAt(2));
  green=hexToInt(response.charAt(3))*16+hexToInt(response.charAt(4));
  blue=hexToInt(response.charAt(5))*16+hexToInt(response.charAt(6));
	Serial.print(red);
	Serial.print(", ");
	Serial.print(green);
	Serial.print(", ");
	Serial.println(blue);
	//scale the values to max_brightness, so as not to draw too much current from the cube
	red=map(red,0,255,0,MAX_BRIGHTNESS);
	green=map(green,0,255,0,MAX_BRIGHTNESS);
	blue=map(blue,0,255,0,MAX_BRIGHTNESS);
	Color col=Color(red, green, blue);
	//actually update the color on the cube, with a cute animation
	fill(col);

//cube.background is an immediate color change, where fill(col) does a little animation
//	cube.background(col);
//	cube.show();
    }   

    delay(POLLING_INTERVAL);

}

int hexToInt(char val)
{
	int v = (val > '9')? (val &~ 0x20) - 'A' + 10: (val - '0');
	return v;
}

//fills the LED cube with new new color col  and a little animatiojn
void fill(Color col)
{
	for(int z=0;z<cube.size;z++)
	for(int y=0;y<cube.size;y++)
	for(int x=0;x<cube.size;x++)
	{
	int index=z*cube.size*cube.size+y*cube.size+x;
	cube.setVoxel(x,y,z,col);
	if((index%2==0)||(index==(cube.size*cube.size*cube.size)-1))
		cube.show();
	}
}

String getRequest(String hostname, String path)
{
TCPClient client;
String response="";

  Serial.println("connecting...");

  if (client.connect(hostname, 80))
  {
    Serial.println("connected");
    client.print("GET ");
    client.print(path);
    client.println(" HTTP/1.0");
    client.print("Host: ");
    client.println(hostname);
    client.println("Content-Length: 0");
    client.println();
  }
  else
  {
    client.stop();
    Serial.println("connection failed");
  }
  int timeout=500;
  int requestTime=millis();
  while((client.available()==0)&&((millis()-requestTime)<timeout))
  {}
  bool headers=true;
  char lastChar='\n';
  while(client.available()>0)
  {
  char thisChar=client.read();
  if(!headers)
  response.concat(String(thisChar));
  else
  {
  if((thisChar=='\r')&&(lastChar=='\n'))	
  {
  	headers=false;
	client.read();  //kill that last \n
  }
  lastChar=thisChar;  
  }
  }
  client.stop();
  return response;
  
}