3Di – the Japanese OpenSim development company just opened the code up for their brand new in-a-browser viewer for OpenSim. It’s written in C#, has plugins for IE and Firefox; and is loosely based on the OpenSim-core team’s “Idealist Viewer”, which uses the Irrlicht 3D engine.

3Di’s innovations have been adding proper avatar support (albeit not the SL ones), improving the framerate fairly dramatically; and of course embedding it into a browser. It’s named “Rei” after the Japanese number for ‘Zero’ – and code is availible under a standard 3-Clause BSD license.

There’s already been a lot of news out there for the announcement of OpenViewer itself – so I probably wont go into too much detail; other than it lets you embed a 3D OpenSim space onto an arbitrary website – something which combined with say OpenID or anonymous login, could do wonders for increasing userbase concurrencies on OpenSim deployments.

OpenViewer has a couple of nifty extensions to the protocol like Mesh support – which uses the Irrlicht Model Format (realXtend uses the OGRE Model & Material Format, SL is planning to use the OBJ format – but dont expect anything for another year or two.); I’m not entirely sure how that plays into the building editor – specifically how you upload & use them, but I’m sure that will be clarified in forthcoming documentation. It will be interesting to see how well it performs on some big complicated sims (like say one of Shenlei’s behemoths), in theory it might behave a little bit better on the server, since libsl handles packeting a lot more sanely (and in lower volume) than the official viewer does.

There’s been some discussion in addition on the opensim-dev mailing list about getting realXtend & Rei both standardising on a common mesh format; COLLADA has been suggested – but the level of filesize bloat raises concerns for realtime streaming downloads of complicated regions.

Site: http://www.3di-rei.org (code & instructions)

Press Release (English): http://www.3di.jp/en/news/2009093001.html

Hopefully in the coming weeks, we can look at ways of embedding this into the OpenSim & OSgrid websites as a quick way to ‘try out’ the sims.