Converting formats, I've been able to get all three working in SonLVL (albeit with slight source modification for Ristar).
Ristar's level format is very similar to Sonic 1, although plenty of things are compressed into a unique "Star" format. DRX has more info on the format. Additionally, bit flags in the chunk blocks are assigned differently, such as flipping.
For Crackers and Chaotix, this is more similar to Sonic 2/3. Chunks and blocks can load just fine, but you'll need to manually define the level size in the program to load the level. The collision indexes are also inverted.
In all of these, the background is split off into it's own files.
I hope easy access to all of this can be done in the future!!
Converting formats, I've been able to get all three working in SonLVL (albeit with slight source modification for Ristar). Ristar's level format is very similar to Sonic 1, although plenty of things are compressed into a unique "Star" format. DRX has more info on the format. Additionally, bit flags in the chunk blocks are assigned differently, such as flipping. For Crackers and Chaotix, this is more similar to Sonic 2/3. Chunks and blocks can load just fine, but you'll need to manually define the level size in the program to load the level. The collision indexes are also inverted. In all of these, the background is split off into it's own files. I hope easy access to all of this can be done in the future!!