BHUNP body and BakaFactory ABC, The penis misses its target

[poblivion]

Hi, I have a question. I use a BHUNP body and BakaFactory ABC. I recently switched to Skyrim SE. While everything worked great in Skyrim LE (precise penetration, penis hitting its target exactly), unfortunately it doesn't work properly in Skyrim SE. The characters are the right size, the hands are held in the right position, everything fits, except that the penis is pointing in the wrong place. Maybe I made a mistake somewhere during the installation, but I don't know where. Can you advise me what could be causing this?

Spoiler

Spoiler

 

[traison]

As far as I know, the position of the back door hasn't been standardized. You can see a hint of this in BodySlide where there's usually a slider for moving it up/down depending on which "standard" you're using. Some animations go through the tail bone, others are so close to the vag it's impossible to get physics to distinguish between the 2.

[poblivion]

1 hour ago, traison said:

As far as I know, the position of the back door hasn't been standardized. You can see a hint of this in BodySlide where there's usually a slider for moving it up/down depending on which "standard" you're using. Some animations go through the tail bone, others are so close to the vag it's impossible to get physics to distinguish between the 2.

 

Thanks for the info. I looked at BodySlide and the preset I'm using has the anus positioned further away from the vagina. I noticed, however, that during the animation, the anus opens towards the vagina. It's strange that the same animation works correctly in Skyrim LE, I don't know where the problem is.

 

 

 

Spoiler

 

Edited September 7, 2025 by poblivion

[traison]

The physics systems we have in SE are quite different from the ones we had in LE. CBPC didn't even exist in LE, and SMP was a closed-source project. SMP switched physics engines from Havok to Bullet too some time during this. Weightpainting on the bodies is most likely different too. There's been quite a lot of progress in both of these fields since LE. My point here being that outside of carefully controlled scenes, I wouldn't count on the back door working reliably.

 

Your best bet with the current systems might be to use actual collisions rather than those provided from anal node collisions in CBPC. Meaning, either have SMP handle it, or set up collision shapes for the various anus bones and disable collisions through the anal node. This will allow it to stretch in one direction but not another, but this method comes with its own issues; jittering and generic instability being the most likely ones.

 

Edit: I'm not familiar with UNP based bodies. It's entirely possible you're getting worse results if the back door is in a different location compared to where it is on CBBE, and animations are made for CBBE. A bit like how there might be alignment issues with TNG, because SOS has been the standard for half a decade or more - all animations are made for SOS.

Edited September 7, 2025 by traison

[poblivion]

On 9/7/2025 at 6:45 PM, traison said:

The physics systems we have in SE are quite different from the ones we had in LE. CBPC didn't even exist in LE, and SMP was a closed-source project. SMP switched physics engines from Havok to Bullet too some time during this. Weightpainting on the bodies is most likely different too. There's been quite a lot of progress in both of these fields since LE. My point here being that outside of carefully controlled scenes, I wouldn't count on the back door working reliably.

 

Your best bet with the current systems might be to use actual collisions rather than those provided from anal node collisions in CBPC. Meaning, either have SMP handle it, or set up collision shapes for the various anus bones and disable collisions through the anal node. This will allow it to stretch in one direction but not another, but this method comes with its own issues; jittering and generic instability being the most likely ones.

 

Edit: I'm not familiar with UNP based bodies. It's entirely possible you're getting worse results if the back door is in a different location compared to where it is on CBBE, and animations are made for CBBE. A bit like how there might be alignment issues with TNG, because SOS has been the standard for half a decade or more - all animations are made for SOS.

 

Thanks for the explanation, I'll probably go back to Skyrim LE.

 

PS: I also tried the CBBE body and the result was similar (maybe a little better, but still bad).

[traison]

7 hours ago, poblivion said:

Thanks for the explanation, I'll probably go back to Skyrim LE.

 

The back door was no more standardized in LE. If it's working better in LE, it's more luck than anything: cherry-picked animations.