Are you referring to this one?
Yes, yes, yes, yes
According to the original blog post, it is neither a stable/release nor a regular beta, but an alpha version (internal beta).
The specific differences are as follows:
Earlier than Beta version: Alpha version is usually earlier than Beta version in the software version cycle, belonging to the earliest and most unstable testing stage.
The original text clearly states that both the blog title and body clearly state that this is an “Alpha version”, and the author specifically emphasizes that the code is “unstable”, “may have bugs”, and “does not guarantee syntax compatibility in future versions” (which means that the code you are writing now may encounter errors in the next update).
Why was it released: Because the official Box2D 2.1 version from upstream was delayed, the author first released the code in Alpha form for everyone to try.
Summary: This is an early beta version (Alpha), not an official version for production use. If you want to use it in a project, you need to be mentally prepared for encountering bugs and future API changes.
Has anyone encountered any problems while using “box2d2.1a” since its release over 10 years ago? Thank you.
I recommend you stress test it in the ways you need it to perform reliably and confirm that for yourself.
Even if another user was experience with it, it’s possible they’re not using it in the way you might. If you’re using the ActionScript 3.0 version though, I’m not sure what options you have in terms of reporting bugs. Fixing them, if any are found, might be on you?
If you don’t feel confident that Box2D 2.1a is stable enough, you should probably use an older version instead. There are several versions available in SourceForge. The newest that isn’t alpha is 2.0.2.
I tested ‘box2d nape-haxe4’ on the ‘air html5’ target separately,
The testing method is to add a large number of objects that fall under the influence of gravity,
There are static objects blocking the left, right, and bottom of the window.
The two physics engines on the ‘air’ target have similar numbers of objects,
But on the “html5” target, “box2d” can add slightly more objects,
This was tested in ‘Drawing Debugging’, and it seems that ‘nape drawing debugging consumes more than box2d’“
”Both physics engines on the ‘air’ target can add ‘300 objects’,
On the goal of “html5”, “box2d 150 nape100”
These are used for drawing debugging and testing,
That is to say, physical objects are drawn in vector graphics
Thank you very much for providing the link,
It seems that “as3box2d2.1a” has been ported to “haxe box2d”