Create a collection of boxes using THREE.js and save them in a 3D array

My latest project involves rendering a 16x16 grid of boxes in THREE.js using custom code.

const drawGroup = () => {

    const blockSize = 16

    // Positioning
    for (let x = 0; x < blockSize; x++) {
        for (let y = 0; y < blockSize; y++) {
            for (let z = 0; z < blockSize; z++) {
                const mesh = new THREE.Mesh(geometry, material)
                mesh.position.set(x, y, z)
                scene.add(mesh)

                const lines = new THREE.LineSegments(edgesGeometry, edgesMaterial)
                mesh.add(lines)
                //console.log(mesh.position)
            }
        }
    }
}

drawGroup()

Now, I am looking to save all the positions of the box group in a 3D array. How can I achieve this?

Answer №1

To achieve this, you can simply nest arrays within arrays within arrays.

const blockConstant = 16

// Initialize an array in the x-dimension
const positions = [];

// Iterate over x-axis
for (let x = 0; x < blockConstant; x++) {

    // Create a new array inside x-dimension with y-dimensions
    positions[x] = [];

    for (let y = 0; y < blockConstant; y++) {

        // Create a new array inside y-dimension with z-dimensions
        positions[x][y] = [];

        for (let z = 0; z < blockConstant; z++) {

            // Assign values to the 3D-array
            positions[x][y][z] = `${x}, ${y}, ${z} \n`;
        }
    }
}
console.log(positions.toString());

It's worth noting that a 16 x 16 x 16 block will result in 4096 meshes, potentially impacting performance. Consider using instancing methods to render all blocks in a single drawcall and enhance framerate.

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