AnalyticalGraphicsInc/cesium — pull request #275 by bagnell (2012-09-28 19:25:20+00:00)
Title: BoundingSphere union

Fix `BoundingSphere.union` where the result parameter is the same as another argument, like:

```javascript
BoundingSphere.union(bs1, bs2, bs1);
BoundingSphere.union(bs1, bs2, bs2);
```

This fixes #274.