wip Real-Time Body Physics (DirectX 11)

[alexlll]

Is there any chance you'll start improving the core functionality of RTBP in the near future? Currently, there are a large number of different versions for DX9 and DX11, all of which work differently, and I have to choose between them (I personally use one of the older versions for DX9). I'd like to see a DX11 version where I can use sliders to perfectly adjust the breast (and possibly butt) movement to my specific needs, not what you think.

[CPVC]

1 hour ago, alexlll said:

Is there any chance you'll start improving the core functionality of RTBP in the near future? Currently, there are a large number of different versions for DX9 and DX11, all of which work differently, and I have to choose between them (I personally use one of the older versions for DX9). I'd like to see a DX11 version where I can use sliders to perfectly adjust the breast (and possibly butt) movement to my specific needs, not what you think.

 

I'm not sure what you mean. If more fine grained control over the sliders is what you want, the range of them can be adjusted and values can be directly input. Right click on a slider to split/join, configure, and reset and hold the control key and click to directly enter values.

 

See here: https://streamable.com/puqe3t

[yty001]

請問我該怎麼辦？我按照說明文件操作了，打開遊戲後就彈出這個東西。

 

this is how my RTBP file looks like.

 

 

Edited March 24 by yty001

[CPVC]

2 hours ago, yty001 said:

What should I do? I followed the instructions, but this message popped up after I opened the game.

 

this is how my RTBP file looks like.

 

 

 

Choose the directory where the Sims 4 is installed. It will be the same place the RTBP "d3d11.dll" was installed. The Companion needs to know where the RTBP "d3d11.dll" is installed so it can get the version information from it to check for updates.

 

You don't need to run the Companion directly unless you want to check for updates. Just run the game after RTBP is installed to use.

[FutaLover25]

if u press Alt+Tab, this mod closes the game and asks for the directory, even if u point the way to the Bin folder (where The Sims 4 and d3d11.dll is located) the error appear

[CPVC]

53 minutes ago, FutaLover25 said:

if u press Alt+Tab, this mod closes the game and asks for the directory, even if u point the way to the Bin folder (where The Sims 4 and d3d11.dll is located) the error appear

 

Sorry, it needs to be the root of the installation directory, not the "Game\Bin\" directory. The location the Sims 4 was installed.

[FutaLover25]

1 hour ago, CPVC said:

 

Sorry, it needs to be the root of the installation directory, not the "Game\Bin\" directory. The location the Sims 4 was installed.

still crashing when Alt+tab, maybe something wrong with window mode

[CPVC]

13 minutes ago, FutaLover25 said:

still crashing when Alt+tab, maybe something wrong with window mode

 

Yeah, try borderless windowed. And please submit error reports if you encounter any other crashes. I'm hoping this new error reporting system can help me get to the bottom of issues like this.

[CPVC]

Thanks for checking out the experimental build and sending in your error reports, everyone. Looks like we've made some progress, but another, very similar issue has appeared. I think we might be dealing with a compiler bug here, but I'm not certain. I've put together another build that might move us forward or I could be barking up the wrong tree.

 

Anyway, give it a shot if you're up for it. In the mean time, I'm going to look into alternative compilers or maybe upgrading to the latest version of the compiler we're using in the hopes that they've fixed the bug if it exists. Thanks for your help.

 

RTBP 2.1-p1-e2 2026-03-26.zip

 

Edit: Oh, I should mention that I'm making a new installer in the new lightweight GUI toolkit I made the Companion in. This one will ship with all non-experimental releases, so no more having to download the installer separately. This ought to greatly simplify things for everyone.

 

Edited March 26 by CPVC
Installer

[Jazroy]

 

 

Hello, so I got this.

 

Log.txt

[CPVC]

17 hours ago, Jazroy said:

 

 

Hello, so I got this.

 

Log.txt 7.62 kB · 1 download

 

No need to post your logs here anymore. You can just click "Send" to send your log to me.

 

You are suffering from another common error that a lot of users that have submitted error reports have. I'm going to be putting out experimental builds much more often, so hopefully with some testing and users being good about sending their error reports in, we'll get this sorted in time.

[0Spirit0]

Are you a time traveller? 😏

 

[CPVC]

4 hours ago, 0Spirit0 said:

Are you a time traveller? 😏

 

 

Ha, no. I'm using a Python script to put together packages and it might not be putting in the correct date for newly created folders for some reason. Could be a bug in Python's "zipfile" module.

[CPVC]

I didn't really spend much time implementing angular physics aside from some experiments and adding the variables for them. They're disabled by default and enabling them just causes the breasts to spin out of control, but today I've been working at seriously implementing them and I like what I see so far. This could be in RTBP very soon.

 

https://files.catbox.moe/5xwfip.webm
https://files.catbox.moe/ruflqh.webm
https://streamable.com/v2gonc
https://streamable.com/ro4fwd

 

Edit: Latest experimental build has the angular physics. Check it out and let me know what you think:

RTBP v2.1-p1-e4 2026-03-30.zip

Edited March 30 by CPVC
Add link to latest experimental build.

[alexlll]

I don't understand how to set this up; it doesn't respond to the sliders and there's no way to turn anything on or off. https://drive.google.com/file/d/1rumFMZrhpQb19TIzSDEdaByBdW8XOsj8/view?usp=drive_link

[CPVC]

Wow, this is looking great! I wish I had gotten angular physics figured out earlier:

 

https://streamable.com/0ukdjd

[gloriousyuri]

is this basically procedural replacement for bouncing boobs by tonic?

[CPVC]

1 hour ago, gloriousyuri said:

is this basically procedural replacement for bouncing boobs by tonic?

 

It's real-time physics simulations added to the Sims 4. The simulators respond to the sim's movements and add physics to body parts, like the breasts and butt. The kind of jiggle physics you find in other games.

[HpMpAp]

There is a problem with the mod, and is that the sims 4 folder in documents folder is only called "the sims 4" for english users. For example, in spanish it's called "los sims 4", but your mod can only read from "the sims 4". With the little I know about programing, I think that has a very easy fix, but if it doesn't, then it would be great if you said in the instructions that if the sims folder inside documents has a different name, you MUST create one called "the sims 4" and add there the RTBP folder.

[CPVC]

7 hours ago, HpMpAp said:

There is a problem with the mod, and is that the sims 4 folder in documents folder is only called "the sims 4" for english users. For example, in spanish it's called "los sims 4", but your mod can only read from "the sims 4". With the little I know about programing, I think that has a very easy fix, but if it doesn't, then it would be great if you said in the instructions that if the sims folder inside documents has a different name, you MUST create one called "the sims 4" and add there the RTBP folder.

 

Oh, I had no idea they had different folder names for different languages. I'll add that to the readme and maybe come up with some other way of determining the documents directory. Thanks for the heads up.

[RyuK_]

I just updated from the old DX9 version to the DX11 version and I am running into issues to make it work. I replaced the RTBP Mod folder in the mods folder with the new one, replaced the RTBP folder with the new one, placed D3D11.dll in the game folder. The mod appears to have been loaded correctly, with the watermark appearing and the F11 menu working, the log says a connection has been established but there are no physics in game. I even tried changing some of the simulation parameters so they work even when the game is paused or in different speeds. No dice. I also confirmed this is the DirectX 11 one, not the DirectX 9 one. The checkbox is disabled.

[CPVC]

1 hour ago, RyuK_ said:

I just updated from the old DX9 version to the DX11 version and I am running into issues to make it work. I replaced the RTBP Mod folder in the mods folder with the new one, replaced the RTBP folder with the new one, placed D3D11.dll in the game folder. The mod appears to have been loaded correctly, with the watermark appearing and the F11 menu working, the log says a connection has been established but there are no physics in game. I even tried changing some of the simulation parameters so they work even when the game is paused or in different speeds. No dice. I also confirmed this is the DirectX 11 one, not the DirectX 9 one. The checkbox is disabled.

 

Any of the tests work (GUI -> Misc. -> Linear Testing -> Test X/Y/Z)? Which version of RTBP are you running?

[RyuK_]

6 hours ago, CPVC said:

 

Any of the tests work (GUI -> Misc. -> Linear Testing -> Test X/Y/Z)? Which version of RTBP are you running?

 

I tried the Linear Testing and no, no change. I first tried the RTBP v2.1-p1 version, then the RTBP v2.1-p1-e4 to see if it had fixed anything but also no change. Also, I just tested the DX9 version again without changing any of the mod files, I just put the dx9 version dll back in and it does work.

Edited April 4 by RyuK_

[CPVC]

13 hours ago, RyuK_ said:

 

I tried the Linear Testing and no, no change. I first tried the RTBP v2.1-p1 version, then the RTBP v2.1-p1-e4 to see if it had fixed anything but also no change. Also, I just tested the DX9 version again without changing any of the mod files, I just put the dx9 version dll back in and it does work.

 

Hmmm, ok. Could you post your log from the DX11 version? There's got to be some reason why you're not seeing any movement.

[mabebico]

hi any chance to fix this issue:

1. Some of the custom CC clothing does not align with the physics the breast is not doing the physics instead the top clothing only.
2. Half butt messed up and need to do few slide but when back to switch from another clothing type back again.
3. And when sim running (On Jogging) it didn't jiggle i think because of the setting, so im still a bit confused with the GUI setting to get the best physics.