Toolpath renderer for Java

This question applies to the CNC group's programming community. I
want to create an isometric view of a tool moving around it's
toolpath (or of the path already completed). It seems like every CAM
package out there now, even the free ones, have this type of
capability. Therefore, before I go digging around, I thought I'd ask
if anyone knows of some available libraries that can handle this. In
my particular case, I need this functionality within Java (although
others may have similar interests in other languages, so why don't we
simply open up the topic to any language). Java has APIs for just
about everything and I know one exists for 2D/3D graphics. In truth,
I'm not sure this renderer would need to be a 3D function because I
don't intend on rotating the image, etc (hmmm, maybe I should if it
is easy). It could well be that someone will simply say "take a look
at the 2D API)... that is fine. I haven't done any investigation at
this point in time.

Thanks,
Alan