wip Real-Time Body Physics (DirectX 11)

[Rekonomics]

Also rtbp commander has been working well with this version. The in game gui is turned off in the d11 version im using from last week. So f8 and F11 shouldn’t open anything. Commander works nicely!

Edited December 30, 2025 by Rekonomics

[RealSiViX]

16 hours ago, Fionnachree said:

Hi CPVC, thank you for the update  I would like to provide some feedback. I was able to open my game with the GUI version (and I did not experience any crashes. I also noticed that the my sim's image in the UI was not distorted. However, I noticed that the UI was still distorted for other sims and that the right butt cheek appears to be sagging in some outfits. I also noticed that sometimes, when selecting outfits, the back would stretch out (similar to the image of Mortimer in the UI)  for half a second, but would immediately return to normal. Also, is there an alternative to F11 to open the GUI (totally cool if there isn't)? Thank you again for the update, this mod is really cool.

 

I haven't fully figured it out yet, but it seems to be related to the clothing and/or accessories the Sim is wearing, if you strip them down, their bodies are fine. What I have been doing is stripping their top, then bottom, then accessories until I find the offending the item, remove the sim, re-add them, then remove or replace the item(s) causing the sag...

 

Sometimes, it might take a little searching to find an item similar to the one you are replacing that doesn't cause the problem but I have been able to find something to fix all of my Sims so far...

[Fionnachree]

On 12/29/2025 at 10:53 PM, CPVC said:

 

Those are known issues, things I hope to remedy soon. There are still a lot of little bugs like this that need to be resolved and will be with time. I'm glad to hear that it's stable, though. That's what I'm really concerned with now.

 

As for alternatives to opening the GUI, F8 is set to open the GUI as well. It could be anything, really, as long as it doesn't conflict with the game. Do you think something else would be better? Should it be configurable in the settings file?

Hi CPVC, thank you for replying. I think the bugs are expected considering the nature of the mod and I appreciate all your effort :). I don't really have a specific alternative for opening the GUI, I think whatever is most convenient for you is fine. Thanks again for the awesome mod.

 

Edit: I tried f8 and it worked. Thanks 🥰

Edited December 31, 2025 by Fionnachree
Added an update

[frenchussay]

16 hours ago, RealSiViX said:

 

I haven't fully figured it out yet, but it seems to be related to the clothing and/or accessories the Sim is wearing, if you strip them down, their bodies are fine. What I have been doing is stripping their top, then bottom, then accessories until I find the offending the item, remove the sim, re-add them, then remove or replace the item(s) causing the sag...

 

Sometimes, it might take a little searching to find an item similar to the one you are replacing that doesn't cause the problem but I have been able to find something to fix all of my Sims so far...

The work around have been using for the clothing glitch: disable butt physics, I also disabled ball just to be safe. Other than the sim UI images sometimes being weird, everything else works out fine. Hope this helps anyone!

[jeno3]

13 hours ago, frenchussay said:

The work around have been using for the clothing glitch: disable butt physics, I also disabled ball just to be safe. Other than the sim UI images sometimes being weird, everything else works out fine. Hope this helps anyone!

Yes, that's exactly what I do too.

[CPVC]

I just released the the new version of RTBP. Thanks for your help in getting it all working. Let me know if there are any major problems with this release and I'll get it fixed as soon as possible.

 

The installer has been updated to work with the new version and I picked some fancy fonts for the internal GUI.

 

Thanks for your help, guys. Happy new year.

 

[jeno3]

Hi and thanks for the update.

 

The butt physics still has glitches, so I've disabled it. The physics settings window looks different for me, I have no idea why. For you, it looks like you can adjust it using the sliders. I can only click in there and the value changes upwards, but not downwards.

 

 

[jeno3]

Just now, jeno3 said:

Hi and thanks for the update.

 

The butt physics still has glitches, so I've disabled it. The physics settings window looks different for me, I have no idea why. For you, it looks like you can adjust it using the sliders. I can only click in there and the value changes upwards, but not downwards.

 

 

I was a little surprised. Some of the files in your mod folder are older than mine. I've now taken all the files from your last mod folder, but mine were newer. I'm sending you two pictures. The first shows how I'm running it now after your update, since you attached the files. The second picture shows how it was before. You can see that the files were newer there. Or are they all the same?

 

 

[CPVC]

2 hours ago, jeno3 said:

Hi and thanks for the update.

 

The butt physics still has glitches, so I've disabled it. The physics settings window looks different for me, I have no idea why. For you, it looks like you can adjust it using the sliders. I can only click in there and the value changes upwards, but not downwards.

 

 

 

Now that's odd. What is your screen resolution? I thought I had UI scaling working, but maybe not.

 

2 hours ago, jeno3 said:

I was a little surprised. Some of the files in your mod folder are older than mine. I've now taken all the files from your last mod folder, but mine were newer. I'm sending you two pictures. The first shows how I'm running it now after your update, since you attached the files. The second picture shows how it was before. You can see that the files were newer there. Or are they all the same?

 

 

 

They are the same. Last time I put together a package I used the files directly from my mods folder which are copies of the originals. This time I just used the originals. They really are that old.

[jeno3]

6 minutes ago, CPVC said:

Now that's odd. What is your screen resolution? I thought I had UI scaling working, but maybe not.

I don't have it open in full screen, only in windowed mode. I'll try it in full screen.

[aardin]

Hi CPVC, I installed the new version this morning, apart from the random vertices it seems to be working great, I have however had 2 crashes in the 8 hours i have played today, it just crashes the game to desktop without even the usual error box popup, i have attached my log from this last crash. I do have 1 small QoL issue tho, i can not remember if the old version had it in the GUI or not, could we get separate (Left/Right) breast sliders please, i like to change the mass of one a tiny (.001 usually) amount so that the simulation doesn't have them always doing the same thing, thanks and keep up the great work.

Log.txt

[xxdungeonxx1]

@CPVC Thanks for the update, its great. I also noticed some quircks with some males. I dont know what is causing some to have bouncing shoulders. I noticed a particular townie, Anjelo Morlind have his shoulders bounce at the school. 

[RealSiViX]

Just wanted to say, played for several hours yesterday with the new release and it has been working great for me. There's still the known issues with some butts and some male shoulders but these are minor issues for me as I can just replace the clothes or accessories causing the butt sag and I can just remove or replace males with bouncing shoulders...

 

Thank you very much for all of your hard work on this!!!

[jeno3]

Something's wrong with my game. I've switched to fullscreen mode, but this only worked if I replaced the DLL file you provided with an older version. With the current version, the game crashes immediately if I change the resolution or switch between fullscreen and windowed mode. However, I don't have any sliders in fullscreen mode either. It still looks exactly the same as in the picture. I've set the resolution to the highest setting.

[jeno3]

I started the game without any additional mods, just with RTBP, but got the same result. No sliders in the GUI, and switching between fullscreen and windowed mode results in an immediate crash. Even opening the task manager causes the game to crash.

 

I have no idea what it could be. I was hoping it was a collision with another mod, but I can now rule that out.

[johnsmith1006]

Log.txt

my game seems to keep crashing out of nowhere after a couple minutes, using latest build. same thing happened with previous ones as well

[CPVC]

15 hours ago, aardin said:

Hi CPVC, I installed the new version this morning, apart from the random vertices it seems to be working great, I have however had 2 crashes in the 8 hours i have played today, it just crashes the game to desktop without even the usual error box popup, i have attached my log from this last crash. I do have 1 small QoL issue tho, i can not remember if the old version had it in the GUI or not, could we get separate (Left/Right) breast sliders please, i like to change the mass of one a tiny (.001 usually) amount so that the simulation doesn't have them always doing the same thing, thanks and keep up the great work.

Log.txt 8.24 MB · 1 download

 

You log file shows that your game crashed because of a Python function. I think the crash might be due to a mod.

 

...
3: 0xb3c99120 PyEval_EvalFrameDefault
4: 0xb3c94880 PyEval_EvalCodeWithName
5: 0xb3c97ec0 Py_CheckFunctionResult
6: 0xb3c99120 PyEval_EvalFrameDefault
7: 0xb3c97ec0 Py_CheckFunctionResult
...

 

You can right click on a slider and choose "Split/Join" to turn a single slider into separate left and right sliders. Also, "Reset" resets to the default values, and "Configure..." opens a dialog where you can configure the range of the slider.

 

15 hours ago, xxdungeonxx1 said:

@CPVC Thanks for the update, its great. I also noticed some quircks with some males. I dont know what is causing some to have bouncing shoulders. I noticed a particular townie, Anjelo Morlind have his shoulders bounce at the school. 

 

Known issue. Still need to get to the bottom of that.

 

6 hours ago, jeno3 said:

I started the game without any additional mods, just with RTBP, but got the same result. No sliders in the GUI, and switching between fullscreen and windowed mode results in an immediate crash. Even opening the task manager causes the game to crash.

 

I have no idea what it could be. I was hoping it was a collision with another mod, but I can now rule that out.

 

Try deleting "...\The Sims 4\Game\Bin\imgui.ini" if it exists. Unbeknownst to me, ImGui, the UI library I'm using for RTBP, makes a settings file for itself where it saves and restores window sizes. This is undesirable for me. I've just disabled this behavior and if others have problems like you, I'll push this change onto the current release.

 

3 hours ago, johnsmith1006 said:

Log.txt 45.07 kB · 1 download

my game seems to keep crashing out of nowhere after a couple minutes, using latest build. same thing happened with previous ones as well

 

Your log file doesn't offer any useful information. It seems like the game crashes without triggering the unhandled exception handler. Any contextual information you can add? What were you doing when the game crashed?

[johnsmith1006]

1 hour ago, CPVC said:

Your log file doesn't offer any useful information. It seems like the game crashes without triggering the unhandled exception handler. Any contextual information you can add? What were you doing when the game crashed?

my sim was just sitting in her house; it seems to crash randomly after a couple minutes. I have wicked whims installed, is there any text file that might have more information that I should add or look at to better understand what's causing this crash? my sims 4 version is 1.119.109.

[CPVC]

2 hours ago, johnsmith1006 said:

my sim was just sitting in her house; it seems to crash randomly after a couple minutes. I have wicked whims installed, is there any text file that might have more information that I should add or look at to better understand what's causing this crash? my sims 4 version is 1.119.109.

 

One of the "lastException_X.txt" or "lastCrash_X.txt" logs in your "...\Documents\Electronic Arts\The Sims 4\" folder might have some information if a mod or something is causing it. Usually when the game crashes, RTBP's unhandled exception handler will catch the exception and print a stack trace, but for some reason this didn't happen for you.

[GDG]

Hello so I am using a ReShade alongside this mod. Now the Reshade no longer uses a D3d11.dll which I should rename according to the readme.  However it seems to completely freak out my reshade. It starts with it flicking on and off, than shaders break and suddenly the game stops working (even with Reshade effects disabled.) Has this ever happened to anyone? Since this is the last mod I added and beforehand everything worked fine, I think it is the reason. But I am not sure

Edit: So after uninstalling the mod and reloading my game I finally was able to leave the lot I was stuck on. So I am guessing this is the culprit. I am attaching the logfile but I do not think it is giving any hints as far as I can tell.

Log.txt

Edited January 4 by GDG

[CPVC]

6 hours ago, GDG said:

Hello so I am using a ReShade alongside this mod. Now the Reshade no longer uses a D3d11.dll which I should rename according to the readme.  However it seems to completely freak out my reshade. It starts with it flicking on and off, than shaders break and suddenly the game stops working (even with Reshade effects disabled.) Has this ever happened to anyone? Since this is the last mod I added and beforehand everything worked fine, I think it is the reason. But I am not sure

Edit: So after uninstalling the mod and reloading my game I finally was able to leave the lot I was stuck on. So I am guessing this is the culprit. I am attaching the logfile but I do not think it is giving any hints as far as I can tell.

Log.txt 76.7 kB · 1 download

 

I'm not sure what's going on with ReShade. I think they may be doing something different to hook the game now, so the documentation might be outdated. Try installing RTBP first, then ReShade. Whatever they're doing now worked for me.

[jeno3]

16 hours ago, CPVC said:

Try deleting "...\The Sims 4\Game\Bin\imgui.ini" if it exists. Unbeknownst to me, ImGui, the UI library I'm using for RTBP, makes a settings file for itself where it saves and restores window sizes. This is undesirable for me. I've just disabled this behavior and if others have problems like you, I'll push this change onto the current release.

I can't find this file on my system, so it doesn't seem to exist. No worries, though. I'm just waiting for a new version. I'm currently using the second-to-last version of D11dll. With that, I have sliders.😉

[xxdungeonxx1]

Besides the shoulder problems, I noticed that sometimes it doesnt work with womans asses, and it also makes the game crash on loading a new world or traveling. Its great overall, Im looking forward to see it without these minor bugs, Nice work. 

[BossCowboy]

On 12/25/2025 at 3:00 PM, CPVC said:

 

Thanks for the feedback! Yeah, there are still some known issues, hopefully none of which are a deal breaker for anyone. I'm sure they'll get sorted with time. I really want to get the GUI working for everyone so I can release this, then I can focus on fixing the rest of the visual glitches for the next release. So thanks for you log file, that should help.

 

Gorgeous sim, by the way. She's a cutie.

Game crashes try this combination- RTBP v0.4-p9-e3 2025-12-11  -  RTBP v2.0 2026-01-01

[Pantera2]

My game won't even launch with the .dll or D3d11.dl  files in the Bin. It launched just fine without them so I don't know what to do here. I'm using RTBP v2.0 2026-01-01 and RTBP GUI Tools 2026-01-01.zip.

Edited January 5 by Pantera2