CODEWITHSUNDEEP
javascript3dthree.jsperspectivecamera
Michael Paccione
Michael Paccione

Reputation: 2817

How to rotate camera so it faces/above point on sphere (Three.js)

I'm wondering if anyone has an idea on how to rotate a camera so the camera faces directly above a point on the sphere.

UPDATE

Radio's answer is correct. After some debugging it looks like my coordinates were reversed.

Upvotes: 0

Views: 1305

Answers (1)

Radio
Radio

Reputation: 2853

I have created a fiddle: http://jsfiddle.net/kbtn6pz5/

This moves the camera over a random point on the sphere, applies a lookAt property and then sets the altitude of the camera over the sphere's surface.

Based on the fiddle boilerplate...

    var camera, scene, renderer, geometry, material, mesh;

init();
animate();

function init() {

    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 10000);




    scene.add(camera);
        var rad = 200;
    geometry = new THREE.SphereGeometry( rad, 32, 32 );
    material = new THREE.MeshNormalMaterial();

    mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);

    var point = THREE.GeometryUtils.randomPointsInGeometry( geometry, 1 );

    var altitude = 100;

    var coeff = 1+ altitude/rad;

    camera.position.x = point[0].x * coeff;
    camera.position.y = point[0].y * coeff;
    camera.position.z = point[0].z * coeff;
    camera.lookAt(mesh.position);

    renderer = new THREE.CanvasRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);

    document.body.appendChild(renderer.domElement);

}

function animate() {

    requestAnimationFrame(animate);
    render();

}


function render() {
    renderer.render(scene, camera);
}

Upvotes: 2

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