Help on video effect

Hi everyone. I am new to coding.
This “effect” is almost done in terms of the overall look, but I can’t understand how to smooth out the pixelated lines (examples below).
There’s a difference between P2D/P3D, but it’s not enough. pixelDensity() got me to a better place, but the lines are still broken as you’ll see.

I am aware that this might not be the best way to produce this effect – I am open to learning other ways if necessary.

Here is the code:

//////////////////////////////////////////////////////////////////////////

import processing.video.*;
import processing.video.Movie;
Movie myMovie;

int cellSize = 1;
int cols, rows;

void setup() {
  size(1280, 720, P3D);
  cols = width / cellSize;
  rows = height / cellSize;
  colorMode(RGB, 255, 255, 255, 255);
  myMovie = new Movie(this, "movie.mp4");
  myMovie.loop();
  loadPixels();
  pixelDensity(2);
}

void draw() {
  background(0);

  if (myMovie.available()) {
    myMovie.read();
    myMovie.loadPixels();

    // Begin loop for columns
    for (int i = 0; i < cols; i++) {
      // Begin loop for rows
      for (int j = 0; j < rows; j++) {      
        // Where are we, pixel-wise?        
        int x = i*cellSize;
        int y = j*cellSize;
        int loc = (myMovie.width - x - 1) + y*myMovie.width; // Reversing x to mirror the image

        float r, g, b;

        r = red(myMovie.pixels[loc]);
        g = green(myMovie.pixels[loc]);
        b = blue(myMovie.pixels[loc]);
        // Make a new color with an alpha component

        float adjustBrightness = 1;
        r *= adjustBrightness;
        g *= adjustBrightness;
        b *= adjustBrightness;

        r = constrain(r, 0, 255);
        g = constrain(g, 0, 255);
        b = constrain(b, 0, 255);  

        color NewCol = color(r, g, b);
        pixels[loc] = NewCol;

        // Code for drawing a single rect
        // Using translate in order for rotation to work properly
        pushMatrix();
        translate(x+cellSize/2, y+cellSize/2);

        // Rotation formula based on brightness
        rotate((2 * PI * brightness(NewCol) / 255.0));
        rectMode(CENTER);       
        noFill();
        stroke(NewCol);
        strokeWeight(.1);     
        rect(0, 0, pmouseX, pmouseY);
        popMatrix();
      }
    }
  }
}

//////////////////////////////////////////////////////////////////////////

P2D P3D with pixelDensity