ray-sphere-intersection:测试射线是否与球体相交

# ray-sphere-intersection [](http://github.com/badges/stability-badges) Test whether a ray intersects with a sphere. ```js var intersect = require('ray-sphere-intersection') var origin = [0, 0, 4], direction = [0, 0, -1], center = [0, 0, 0], radius = 1 var hit = intersect([], origin, direction, center, radius) if (hit) { console.log(hit) // [0, 0, 1] } ``` Adapted from [LibGDX](https://github.com/libgdx/libgdx/blob/9eba80c6694160c743e43d4c3a5d60a5bad06f30/gdx/src/com/badlogic/gdx/math/Intersector.java). PRs for optimizations/etc welcome. ## Usage [](https://www.npmjs.com/package/ray-sphere-intersection) #### `out = intersect(out, origin, direction, center, radius)` Determines if the 3D ray `(origin, direction)` intersects with the 3D sphere `(center, radius)`. **Note:** `direction` must be normalized before calling this method If no intersection occurs, returns `null`. Otherwise, the intersection point is stored in `out` and then returned. ## License MIT, see [LICENSE.md](http://github.com/mattdesl/ray-sphere-intersection/blob/master/LICENSE.md) for details.