It doesn't seem like you are exactly asking a question about using godot as is nor do you really seem to be new to godot so I'll remove those couple of tags.
Cool project BTW. Very exciting.
I plan on implementing the Physics Engine from Horizon Zero Dawn... I need help
Megalomaniak removed the tags .
Megalomaniak I mean I am asking for help from anyone out there whose pro... and this is my first time working on adding this big of a PR...
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Should be possible with GDExtension, but I would highly recommend you test with GodotPhysics, and see if it works well enough, or use that time and effort to improve GodotPhysics. You can do rag-dolls in Bullet or GodotPhysics just fine. Grand Theft Auto used Bullet, for example, as have many AAA games. I think in Godot the IK and procedural animation support is weak. You can do it, but it requires more work. However, all the basic features are there. So I doubt there is anything that simply can't be done with Godot out of box right now. Sure, you may need to code some things yourself, or maybe performance is not state of the art, but it's not like it can't be done.
cybereality Should be possible with GDExtension, but I would highly recommend you test with GodotPhysics, and see if it works well enough, or use that time and effort to improve GodotPhysics.
By the way, I guess so. It might be better to try to use the tools available in the engine. And if it fails to refine them to the necessary requirements, only then does it make sense to include third-party tools.
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Certainly a cool project. No intention to be defeatist, and you probably have already thought that through. Why not just implement the ragdoll system if that's the main purpose (and can be isolated), and dedicate the rest of the time to making Godot better(tm) ?
Btw. do Godot physics make use of the graphics card ?
Godot uses CPU physics AFAIK. GPU physics would be interesting, can could possibly be done with GDExtension.
Jolt does sound interesting. I need to test how well it would work in a 2D environment (in my own engine, not Godot). I've already found PhysX 4.1 is much faster at 2D (via axis locking 3D) than Box2D.
@cybereality @Tomcat Thanks for the advise. I'm actually after how jolt handles ragdoll animations. I need it's skeleton mapper, Twist&SwingMotors, Ragdoll mass&inertia recalculator and a bunch more stuff I found when I checked out the library's sample build.
Now I could, just remake what Jrouwe built ... OR open up the possibilities of gaining more traction for Godot, help people out in learning how to contribute to the repo and possibly attract more people to help with the in house physics engine... and this would make great content for my Youtube channel and portfolio 
Speaking off the inhouse engine, I was looking at how I could help out in adding a constraint solver class. After a long assessment, I know that I don't know enough about physics engines and how to help out Godot just yet.
If I want to help, I want to do this properly. I'm doing this as a learning experience before diving into the inhouse engine. I also want to do good while doing it... sighs and get clout for my game.
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PHOBOSS I had the idea of doing a similar model for the ragdoll:
but I'm still at the beginning of my path.
You might be interested in looking at this: Cascadeur — 3D animation software.
I still have to work with character physics, I haven't got that far yet in Godot, but I've done rag dolls in older engines. This was one of my demos where I was trying to sort of recreate the gravity gun from Half Life 2. It was actually kind of a duct taped solution, but it works. That's what I was saying with Godot, it doesn't come with everything out of the box, but all the pieces are there.
Tomcat yeah, I know about it... but for now its mostly for humanoid rigs. I know they have plans for other forms like quadrupeds but I plan on giving my players the freedom to build how they'de like.
I've dealt with machine learning before and I really want to train something like what Nvidia did with that spartan rig of theirs but for something free form like a "Chimera" or something... that would actually be a dope name for an AI system like that.
My plan was to randomise rig shapes and forms ontop of randomising animation in a plausable way enough for it to be physically possible for the AI to successfully animate any form of rig.
That way, you wouldnt need to retrain the rig each time you need it to do something else heck you wouldnt even need to train a nonconventional rig. Just hook up your physics bones, give it an animated skeleton of itself and it would match it... or atleast thats the plan.
Im just going to put this out here in the hopes that someone else can do it cause I know its going to be a while for me to be able to. Mostly because I dont have the gpu power (or money) to do it myself.
But for right now... imma stick with the wallet friendly way of doing this...
cybereality it looks great! Whats so "duct taped" about this?
PHOBOSS but for now its mostly for humanoid rigs.
no longer mostly:
A Step by Step Guide to Creating Rigs for Non-Humanoid Characters
Tomcat you think that their AI can handle stuff like birds, insects and cephalopods? Im not really familiar with their AI system but if its anything close to Nvidia's, I can guess that they use a base rig and train the ai on that. So far I dont see any octopus, humingbirds or centipede being showcased yet.
PHOBOSS you think that their AI can handle stuff like birds, insects and cephalopods?
It's better to ask them, I don't know their capabilities. But I suppose it's better to start with something simple.
Octopuses live in water, insects have slightly different physiology than mammals… in my opinion, AI which is supposed to be so universal, needs to take into account so many too different factors like habitat (water or air), body structure… etc. In my opinion such a project is cooler than an open world implementation…
