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handeyeco/randomVectorBetweenSpheres.js

Created August 29, 2017 19:21
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  1. Matthew Curtis created this gist Aug 29, 2017.
    24 changes: 24 additions & 0 deletions randomVectorBetweenSpheres.js
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    Original file line number Diff line number Diff line change
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    /*
    randomVectorBetweenSpheres(radius: Number, depth: Number) -> THREE.Vector3
    @param radius <Number>: Radius of inner sphere (distance between center of sphere and closest possible random vector)
    @param depth <Number>: Distance between inner sphere and outer sphere (radius+depth = furthest possible random vector)
    */
    function randomVectorBetweenSpheres(radius, depth) {
    // Create random radius between radius and radius+depth
    const randomRadius = Math.floor(Math.random() * (radius + depth - radius + 1) + radius);
    // Return random vector on sphere with random radius
    return this.randomSphereSurfaceVector(randomRadius);
    },

    /*
    randomSphereSurfaceVector(radius: Number) -> THREE.Vector3
    @param radius <Number>: Radius of sphere on which to put a random vector
    */
    function randomSphereSurfaceVector(radius) {
    const theta = 2 * Math.PI * Math.random();
    const phi = Math.acos(2 * Math.random() - 1);
    const x = radius * Math.sin(phi) * Math.cos(theta);
    const y = radius * Math.sin(phi) * Math.sin(theta);
    const z = radius * Math.cos(phi);
    return new THREE.Vector3(x, y, z);
    }