Project Goal: Create a 3D voxel-based world using Three.js and Cannon.js that features player movement and controls, chunk management, a day-night cycle, and block placement/removal mechanics.

Requirements:

Setup Three.js Scene:

Initialize a THREE.Scene, THREE.PerspectiveCamera, and THREE.WebGLRenderer.
Set the scene background to a sky blue color.

Create a canvas to extract pixel data from the loaded image.
Store the pixel data for terrain generation.
Initialize Cannon.js Physics World:

Create a CANNON.World with standard Earth gravity (-9.82 m/s²).
Define a physics material with zero friction and zero restitution to prevent slowing down on different surfaces.
Add the contact material to the world.
Chunk Management for Terrain:

Define chunk parameters:
chunkSize: Size of each chunk (e.g., 16 units).
renderDistance: Number of chunks to load around the player (e.g., 3).
Implement functions to:
Calculate chunk IDs based on position.
Load and unload chunks around the player as they move.
Create a function createGroundChunk(chunkX, chunkZ) to generate terrain chunks:
Create a CANNON.Heightfield shape for physics interaction.
Store chunks in an object for management.
Player Setup:

Create a player physics body using CANNON.Sphere and add it to the physics world.
Set fixedRotation to true to prevent the player from tipping over.
Create a dummy THREE.Mesh to represent the player (invisible in the scene).
Controls and Movement:

Implement keyboard controls for movement:
W/S for forward and backward.
A/D for left and right strafing.
Space for jumping.
Implement camera controls with inertia:
ArrowLeft/ArrowRight for turning left and right.
ArrowUp/ArrowDown for looking up and down.
Use event listeners to handle keydown and keyup events.
Apply movement and rotation based on controls in the animation loop.
Camera Setup:

Position the camera to follow the player smoothly.
Implement smooth camera rotation with inertia and damping factors.
Limit the vertical rotation to prevent flipping.
Day-Night Cycle:

Define variables for day and night durations (e.g., 60 seconds each).
Create directional lights for the sun and moon.
Add THREE.Mesh representations for the sun and moon.
Implement a function updateDayNightCycle(deltaTime) to:
Calculate the positions of the sun and moon over time.
Adjust light intensities based on the sun's position.
Change the sky color between day and night.
Show and hide stars during the night.
Allow the player to adjust the cycle duration using the J key and arrow keys.
Block Placement and Removal:

Use raycasting to detect where the player is pointing.
Implement mouse controls:
Left-click to place a block.
Right-click to remove a block.
Create a function createPhysicalBlock(x, y, z) to add blocks to the scene and physics world.
Update the objectsToUpdate array to manage blocks.
Lighting and Environment:

Add ambient light and directional light to the scene.
Create stars using THREE.Points for the night sky.
Adjust ambient light intensity during the day-night cycle.
Event Handling:

Prevent default browser behaviors (e.g., context menu on right-click).
Handle window resize events to adjust the camera and renderer size.
Animation Loop:

Implement an animate() function to:
Update the physics world.
Update the player's movement and camera position.
Load and unload terrain chunks based on the player's position.
Update the day-night cycle.
Render the scene.
Optimizations:

Use efficient data structures (e.g., objects or maps) for managing chunks and blocks.
Limit the number of active objects to optimize performance.
Physics and Collision:

Ensure the player's physics body interacts correctly with the terrain and blocks.
Implement a raycast to detect when the player is on the ground to allow jumping.
Helper Functions:

getChunkID(x, z): Calculate chunk ID based on position.
loadChunks(): Load and unload chunks around the player.
updatePlayer(): Update player movement and apply physics.
updateCameraRotation(): Apply inertia and damping to camera rotation.
updateDayNightCycle(deltaTime): Update environment based on time.
Additional Features:

Smooth camera movement and player controls for a better user experience.
Adjustable day-night cycle duration for testing purposes.
Visual indicators (like the sun and moon) to represent the time of day.