Add particle-based bird
merge fix
Merge branch 'master' of https://github.com/worklist/hifi
improved bird behavior
merge fix
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
first cut at ray cast scripting
Merge branch 'master' of https://github.com/worklist/hifi into ray_cast_scripting
fix cmake qt issue
more ray picking and intersection work
add example code