www.iforce2d.net

I'm using b2dJson and I'd like to ask how I can load the rube file and get the `fixtureDef`, `bodyDef` instead of the `fixture` and `body`. I ask this because in my game I need to dynamically create new shapes, and I don't know if there's a simple way to copy the same body.

Another problem I've encountered is that I have to design all the elements in the same rube file because different rube files will share different `b2Worlds` when they load up. That means there isn't a simple way to add the body loaded from one rube file into the world created from another rube file (again, if I can get the `Def`s it might be straightforward). The implication is that I can't design the player in one file and use it across different chapters in different files.

I think these problems are fairly common and probably someone has already had solutions for them. I'm fairly inexperienced with Box2D so can that someone share some tips?

For your loading multiple rube files issue it's already been answered. you just need look for it on this forum

Just checked this out https://www.iforce2d.net/forums/viewtopic.php?f=6&t=176 and it solves my problem with multiple files. However I still can't seem to think of a way to recreate the same body (with all the fixtures and possibly joints wired up of course)....? That would mean that I have to adopt a static design over a dynamic one..

yulan6248 wrote:... a way to recreate the same body

How about loading the json again?

...that's indeed one of the solutions but I was looking for something more elegant...It's also limited in the way that you have to put each body that you would like to reproduce in separate files, which is a bit troublesome..

Perhaps the functions of b2dJson for replicating bodies would be useful:
http://www.iforce2d.net/b2djson/#replicating
It's not exactly the 'def' of the body but it's very close, and probably easier to use.

But if you want to reproduce a complex structure of multiple bodies with joints connecting them, I'm afraid that putting the whole structure in a separate file is as elegant a solution as we have at the moment.