Multiple Object Selection

```
What steps will reproduce the problem?
1. There is only one scene URL when setting parameters, how can we add multiple
objects?
2. How to detect mouse event over the object only, not the entire canvas.
3.

What is the expected output? What do you see instead?
I should be able to have multiple objects in the canvas and i should be able to
detect selection when mouseover each of them

What version of the product are you using? On what operating system?

Please provide any additional information below.
Hi, thank you for the awesome work!!! Love it!

```

Original issue reported on code.google.com by `junhong....@solstice.sg` on 10 Aug 2014 at 9:26

Start with the scene URL and object setup described in the issue, then trace the canvas mouse-event handling. Determine how multiple objects are represented and how selection can be scoped to an individual object. Done means multiple objects render in one canvas and mouseover identifies the object rather than only the canvas.

Written by the indexing model from the issue text.