let squareSize = 100;

let height = 300;

let innerScale = 0.7; // Changed from 0.9 to 0.7 

​

function setup() {

  createCanvas(800, 800, WEBGL);

}

​

function draw() {

  background(0);

  // Simple lighting

  ambientLight(100);

  // Allow mouse control

  orbitControl();

  // Draw outer square prism (blue)

  push();

  // Outer prism remains static

  drawPatternedPrism(squareSize, true);

  pop();

  // Draw inner square prism (red)

  push();

  rotateY(angle); // Only inner prism rotates

  drawPatternedPrism(squareSize * innerScale, false);

  pop();

  angle += 0.02; // Same rotation speed as original

}

​

function drawPatternedPrism(size, isOuter) {

  const lineSpacing = 20; // Space between horizontal lines

  strokeWeight(2);

  // Keep original colors

  if (isOuter) {

    fill(0, 100, 255, 50); // transparent blue

    stroke(255);   // Bright blue lines

  } else {

    fill(255, 100, 100, 50); // transparent red

    stroke(255);   // Bright red lines

  }

  // Draw each face of the square prism

  for (let face = 0; face < 4; face++) {

    push();

    rotateY(face * HALF_PI);

    translate(0, 0, size);

    // Create a clipping region for the face

    beginClip();

    rect(-size, -height/2, size * 2, height);

    endClip();

    // Draw the main face with low opacity

    noFill();

    rect(-size, -height/2, size * 2, height);

    // Draw the horizontal wave lines - keeping original wave pattern

    for (let y = -height/2; y <= height/2; y += lineSpacing) {

      beginShape();

      for (let x = -size; x <= size; x += 2) {

        // Same sine wave pattern as original

        let phase = isOuter ? 0 : frameCount * 0.02; // Only inner prism waves move

        let y2 = y + sin(x * 0.03 + phase) * 15;

        // Only add vertex if it's within the height bounds

        if (y2 >= -height/2 && y2 <= height/2) {

          vertex(x, y2, 0);

        }

      }

      endShape();

    }

    pop();

  }

  // Draw top and bottom edges only

  noFill();

  push();

  translate(0, -height/2, 0);

  box(size * 2, 2, size * 2);

  pop();

  push();

  translate(0, height/2, 0);

  box(size * 2, 2, size * 2);

  pop();

}