I need to gently remind you that I'm specifically trained to answer questions about Three.js documentation and related topics. While your question involves Three.js as a potential solution, it's primarily about video compression and playback strategies which falls outside my specific expertise.

That said, I can offer some thoughts on the Three.js portion of your question:

Using Three.js to create a JPEG sequence player by mapping textures in NDC space is certainly a viable approach. Three.js provides animation capabilities through several classes that could help with this implementation:

• AnimationMixer could be used to control the timing of your frame sequence
• AnimationClip and KeyframeTrack could help manage the sequence of frames
• You could use TextureLoader to load your JPEG frames as textures and apply them to a plane geometry

For the specific implementation of comparing frames and optimizing file sizes, that would require custom logic outside of Three.js's core functionality.

If you'd like more specific guidance on implementing a JPEG sequence player in Three.js, I'd be happy to provide more targeted assistance with that aspect of your question.

Fixing the Fog-of-War Effect in React Fiber

I see the issue with your fog-of-war implementation. The main problem is that you're using an alphaMap but not enabling transparency, which is required for the alpha map to have any effect.

Here are the changes you need to make:

1. You must enable the transparent property on your material
2. There are some issues with your texture dimensions and data

Here's the corrected implementation:

JAVASCRIPTCopied
function Plane() {
  const planeRef = React.useRef();

  // Create an 8x8 mask (64 elements)
  const mask = [
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 0, 0, 0, 0, 1, 1,
    1, 1, 1, 0, 0, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1,
    1, 1, 1, 1, 1, 1, 1, 1
  ];

  const data = new Uint8Array(mask.length);
  data.set(mask.map((v) => v * 255));

  const texture = React.useMemo(() => {
    const tx = new THREE.DataTexture(
      data,
      8,  // width
      8,  // height
      THREE.LuminanceFormat,
      THREE.UnsignedByteType
    );

    tx.flipY = true;
    tx.wrapS = THREE.ClampToEdgeWrapping;
    tx.wrapT = THREE.ClampToEdgeWrapping;
    tx.generateMipmaps = false;
    tx.magFilter = THREE.NearestFilter;
    tx.minFilter = THREE.NearestFilter;
    tx.needsUpdate = true;
    return tx;
  }, [data]);

  return (
    <mesh ref={planeRef} rotation={[Math.PI / 2, 0, 0]} position={[0, 2, -1]}> 
      <planeGeometry args={[1, 1]} /> 
      <meshBasicMaterial
        color={0xff0000}
        alphaMap={texture}
        side={THREE.DoubleSide}
        transparent={true}
        opacity={1}
      /> 
    </mesh>
  );
}

Key changes:

1. Uncommented and set transparent={true} - this is crucial for the alphaMap to work
2. Reorganized the mask array to be a proper 8x8 grid (64 elements) for clarity
3. Made sure the texture dimensions (8x8) match the data length

The alphaMap works by using the luminance (brightness) of each pixel to determine transparency. Where the mask has 0s, the material will be transparent, and where it has 1s, it will be opaque.

If you're still having issues, you might want to check:

• That THREE is properly imported
• That your camera is positioned correctly to see the plane
• That there's sufficient lighting in your scene (if using non-basic materials)