What is the best platform/language for a 3D game in a web browser?

Question

I have enjoyed making 2D games in various langues (actionscript 3.0, java, python, others) but now I'm ready to move into 3D and to really get me amped up while learning 3D development I'm going to attempt to make a 3D multiplayer game (I already have server written in python).

I'm looking for a platform that will run a 3D game well in the browser on low end computers with low end internet.

What first came to mind was try Java or use flash/silver light with a 3D framework but I wanted to ask the good people of stackoverflow since performance is a big part of my needs and also good documentation is a plus since I'm just starting 3D development. (the programming language does not matter)

Answer 1

Definitely http://unity3d.com. Cross-platform.., web, iphone, wii.., and more coming soon.

It is so easy to learn (relatively), and so fun to work with!

It is free, or you could choose the Pro version with more advance features (profiling, etc..)

Answer 2

I would go for JOGL.

Performance will not be an issue when going for Java. Not as long as you handle the graphics properly (such as by using JOGL).