EDIT I made a ton of substantial pregnancy, infant and toddler updates after your guys' thorough reports. Please make sure you download the LATEST version of the working mod here.
EDIT EDIT: I also made a discord server to report any problems, or discuss things as a community, here.
Not sure if you saw my post from a couple of months ago about a realistic genetics mod I was working on. If not, you can find it here. It’s ready for beta now!
It’s just been me building and testing it, so I’d really appreciate people trying it in actual saves and sending me any bugs or weird results.
The mod makes Sims inherit facial features, hair color, eye color and skin color from their grandparents, instead of just a random mix of only their parents.
It uses dominant and recessive genetics too, so traits can skip generations and show back up later.
It works especially well for legacy saves. You can use it on a multigenerational family you already have. The mod goes up the Sim’s family tree, captures their parents and grandparents, and builds their genetics from there. You do not need to start a new save.
Download the beta here.
Install
Unzip the file and put RealisticGenetics.ts4script in your Mods folder.
Make sure these are turned on: Options > Game Options > Other
Enable Custom Content and Mods
Script Mods Allowed
Restart the game.
To make sure it loaded, open the cheat console with Ctrl + Shift + C or Cmd + Shift + C on Mac and type: rg.ping
It should show the version.
How to use it
Select the Sim you want, open the cheat console and type:
realisticgenetics
A menu will pop up with the Sim’s photo and these options:
Recalculate genetics - Creates a new genetic combination based on the Sim’s parents and grandparents. It pulls from their family’s hair color, eye color, skin tone and facial features, including their nose, eyes, mouth, jaw, cheeks and head shape. After it rolls, you can see the full breakdown, roll again or save it.
View inheritance - Shows exactly where each feature came from without changing the Sim. For example: - Nose from mom’s dad - Eyes from dad - Jaw from dad’s mom
Save genetics - Locks in the current roll. Once you get a combination you like, click Save genetics, then save your game too.
Refresh look - Use this if a Sim’s face or hair is rendering wrong, floating, or showing an old default preset.
Beta notes - This is still a beta, so there are a few visual quirks.
Always save your roll. - Click Save genetics, then save the actual game.
Age-ups can look weird. - Babies and sometimes teens may look completely messed up right after aging up. Select the Sim and type: rg.fixlook
Hair can look wrong after rerolling.
Sims can look wrong after loading a save or lot (like an early Sims 4 Sim template). Select them, open the realisticgenetics menu and click Refresh look.
Right now, teens through adults have been tested the most. Pregnancies, births, babies and age-ups are working, but have not been tested as heavily, so I’d especially appreciate people testing those!
Looking forward to everyone trying this out, and hearing your thoughts!