What is the best way to visualize the PerspectiveCamera in three.js?

Upon diving into the tutorial on drawing lines in three.js documentation, I came across some intriguing code snippets:

All seemed well and good with the code.

<html>
    <head>
        <meta charset="utf-8">
        <title>My first three.js app</title>
        <style>
            body { margin: 0; }
        </style>
    </head>
    <body>
        <script src="///C:/Users/pc/Desktop/threejs_tutorial/build_threejs.html"></script>
        <script>
        
        const scene = new THREE.Scene();
        
        const camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 );
        camera.position.set( 0, 0, 100 );
        camera.lookAt( 0, 0, 0 );

        const renderer = new THREE.WebGLRenderer();
        renderer.setSize( window.innerWidth, window.innerHeight );
        document.body.appendChild( renderer.domElement );

        //creating a blue LineBasicMaterial
        const material = new THREE.LineBasicMaterial( { color: 0x0000ff } );

        const points = [];
        points.push( new THREE.Vector3( - 10, 0, 0 ) );
        points.push( new THREE.Vector3( 0, 10, 0 ) );
        points.push( new THREE.Vector3( 10, 0, 0 ) );

        const geometry = new THREE.BufferGeometry().setFromPoints( points );

        const line = new THREE.Line( geometry, material );


        scene.add( line );
        renderer.render( scene, camera );


        </script>
    </body>
</html>

What piqued my curiosity was the part relating to PerspectiveCamera in the code snippet.

        const camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 );

The values represent the field of view, aspect ratio, near viewing plane distance, and far viewing plane distance respectively.

But how exactly is this PerspectiveCamera visualized in three.js? Does it resemble what I envisioned?

Check out this Visualization

Answer №1

When it comes to visualizing the PerspectiveCamera in three.js, it truly looks like this:

True Visualization of a PerspectiveCamera

https://i.sstatic.net/byZKT.jpg The height can be calculated using trigonometry if you have the distance from the camera to the near viewing plane and the angle of the field of view.

The width is determined by multiplying the height by the aspect ratio: w = h * (innerW / innerH).

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