Thanks for your reply. What do you mean by "merge several projects together"?
Perhaps I did something wrong but I went to:
https://github.com/hharrisonI took java3d-core, java3d-utils, vecmath (eg. in
https://github.com/hharrison/java3d-core, I clicked Download Zip)
I unzipped them in the same folder C:\Working\Programming\java3d so in there are 3 folders j3d-core, j3d-core-utils and vecmath.
Running ant in vecmath worked. Running ant in j3d-core failed.
If I've done something wrong, please let me know. If not, then the build as it is currently in Github is broken (at least on Windows).