fast led plasma with perlin noise

//Perlin noise plasma procedure
//16x16 rgb led matrix demo
//Yaroslaw Turbin
//https://vk.com/ldirko
//https://www.reddit.com/user/ldirko/
//https://www.reddit.com/r/FastLED/comments/h09406/simple_plasma_effect/

#include "FastLED.h"

// Matrix size
#define NUM_ROWS 16
#define NUM_COLS 16
#define NUM_LEDS NUM_ROWS * NUM_COLS

// LEDs pin
#define DATA_PIN 3

// LED brightness
#define BRIGHTNESS 255


// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}


void loop() {
   uint16_t ms = millis();
  for (int i = 0; i < NUM_COLS; i++) {
    for (int j = 0; j < NUM_ROWS; j++) {
      uint8_t index = inoise8(i * 41, j * 41, ms / 4);  // x and y not change, only change z value with time increment for nice plasma looking noise
   leds[XY (i, j)] = CHSV((index + ms / 200) % 255, 255, BRIGHTNESS); // within palette
     // leds[XY (i, j)] = ColorFromPalette (RainbowColors_p, (index + ms / 200) % 255, BRIGHTNESS ); // with palette

    }
  }

FastLED.delay(1);
  }

uint8_t XY (uint8_t x, uint8_t y) { return (y * NUM_COLS + x);}     //simple function to find led number in led matrix,
                                                                    //change this to your routine
                                                                    //or generate XY function for your matrix there:
                                                                    //https://macetech.github.io/FastLED-XY-Map-Generator/