Distance between 2 points on mesh

```
Hello,

I am trying to make a viewer of mesh object (stl) where we can pick 2 points on
the screen and calcul the distance. Currently I try using the onmousedown event
of the view, I got a PickInfo object with x,y, depth and the clicked mesh. But
the depth is always -infinity. (I use webgl renderer) I looked into the
jsc3d.js and found the the depth is not set when using webgl.

It is possible to retrieve the position (x,y,z) of a pick point on a mesh ?

Thank you.

```

Original issue reported on code.google.com by `FAcarig...@gmail.com` on 9 Mar 2015 at 10:01