Resolved Unity.Physics interactions at runtime

Hello,

First of all, I want to point out some troubles I had with the documentation and give you some context.
I was searching for a way to add a "physic body" at runtime, and never thought that the setup will be showed under the "interacting with the bodies" section. In fact the whole manual is so focus on the authoring/baking pipeline that it almost feel like it's not designed for runtime stuff at the moment. And there was no examples for dynamic creation too.
Even most of the authoring tools are not in the package but in the samples, does it mean that we should really dig into the package to make our owns? But the manual is quite light for this I think.

So by discussing on the forum and on Discord, I come to the conclusion that there was 2 possibilities :
- Using a prefab but disabling the physic simulation (half dynamic)
- Or adding/removing the components myself, because the only one complex to setup (PhysicMass) have an utility fonction for it. Even the smoothing components didn't need a special setup.
Do you have other ways to do so?

Disabling the physic would, in fact, be more useful to existing simulated entities that I want to temporary remove from the simulation. And that's the main question here : how do it correctly?
Nothing on the documentation or in the samples, only information sharing on social network. And the popular option is to remove the WorldPhysicsIndex (or change the value to an "empty" world). That's working so far, but the entity is still used by pretty much all physic systems, just not the BuildWorld. Is that really the clean way to do it? Maybe the simulate tag ?

Thanks !

 

No, they aim to completely unify the authoring with built-in. Currently that's not complete, so the previous authoring components that have all the features are available in the samples.

 

Oh I didn't see the data components section, it's quite important indeed ! It was just a feedback, but having creation/setup stuff inside a section called interractions did misslead me. Tha doesn't excuse the fact that I shoudl have read the whole manual ! But it's also true that not everyone will have the will to do so.
More interresting, maybe, I think adding a link to the data components section inside the create body paragraph would be wise. Because, honestly, after I read the page I thought that there was no more information linked to the creation !
That maybe not the most interresting thread for the dev blitz day though... sorry !

 

Spoiler: Images

That's the relationships of the sphere in the ColliderParade - Basic after I removed the PhysicWorldIndex (the Simulation System is from me). So there is no longer the BuildPhysicWorld unlike the others entities in the scene (which are falling), but there is pretty much every other systems. But maybe it's perfectly fine, at least it works as intended. But that seems weird as a clean solution to temporary "remove" an entity from the physic simulation, if it's still called by pretty much all the physics systems.

I just wanted to double check, especially because you can run into issues if you think it's going to work with every configurationg from PhyscBody authoring : smoothing components needs to be removed.

But if it's the way to go, I'm fine with it ^^

 

Is it supposed to be explicit on this page ? Because that's what I read, but none of the samples even speak about spawning, at least prefabs. Do you have a specific one in mind?
I hope you don't think I'm agressive/bothering, I honestly didn't find it on this page.

Thanks for everything anyway !

 

No need to be sorry ^^
Thanks for the information ! But I guess I should assume there is none for creation "from scratch". Could be a good candidate for a new sample if the team go the time one day !
Thanks for your time !

 

Like in the "Creating bodies from scratch" section there
In fact it's saying that it's similar to something in the samples... but that gif... My guess is that it was removed ?
Maybe also with the smoothing variations.

 

Ah right the gif if for the other section, stupid me.

I don't need the sample code, I know about it now ^^
I'm just pointing out that I think it's weird to not have a setup example "from scratch" as simple it is (most samples are anyway). The modify folder show how to interract with the components, maybe they could be created "from scratch".

I feel like I'm been stubborn on something that bothers only me, sorry ^^