What is the difference between the three branches of main, gzweb2 and gz3d_v2?

[MRSHIMMER]

I want to build an ignition web application.One of the goals of my application is to visualize smoke and fire, which of these branches can currently achieve this goal properly?

In addition, I would like to ask, if my sdf contains the turtlebot3 model used on classic gazebo, or other models that do not exist in the URL "https://app.gazebosim.org/fuel/models", whether "https ://app.gazebosim.org/visualization" to connect to my local ignition can not be displayed normally, need other additional adjustments to work properly.

Looking forward to your reply, thank you!