Some great news for Dreamcast Homebrew Developers:
Holly is a 3D engine SDK for the Dreamcast and is build on top of KOS 1.3.x (KallistiOS). It is implemented in C++, with some amount of SH4 assembly. The main developer of Holly3D is Heinrich Tillack. You can get in contact with him via E-mail info(at)tillack.org.
History - from Iris3d to Holly: In 2002 I added Triangle Strips clipping and IMD animation with vertex interpolation to Iris3D V0.7 by Olivier Chatry. Olivier the author of Iris3D included the patches into Iris3D V0.9.1. Which is the last official version of Iris 3D. In 2003 I started to modifiy this C++ code just for fun! Since 2003 I replaced (rewrote) around 95% of the C++ code, so I called the SDK Holly and NOT Iris-3D V2 as I thought before. Too much has changed - compared to Iris3D. I used the modified 3d engine for my own game projects (like DCASTLE). So here it is. Stay tuned for the upcoming release....