Hi,
Add to classpath works only with swc. You have to add folders as
"linked libraries".
You can create a new lib folder at the same level as your src/bin
folders and put your away3d folder in it (and any other frameworks you
want). Then in FDT you go to YourProjects -> properties (right click) -
> FDT Build Path -> Add Linked Libraries and create a new linked
library pointing its source to the lib folder you've just created.
You can point directly to a3d folder as well, but have one linked
library folder is much more convenient. And you don't have to create
more and more new links once you decide to use some more libraries.