Convert VRoid Studio to MMD With One Click

How can I convert VRoid Studio models to PMX models? Where do I go to download VRoid models? How can I convert VRoid Studio to MMD? 

How to Convert VRoid Studio to MMD With One Click

If you are a frequent reader of my articles, you probably know about my whole  “Little Old Lady Who Swallowed the Fly” problems! I really just want to write one article, but then there’s something I need to write about beforehand so that my article will be better. Sometimes I never get past swallowing the goat to catch the dog, but I always hope that eventually I’ll swallow a horse who will break free and allow all of the other animals to live their best lives.

However, this article isn’t about me – it’s about how to convert VRoid Studio into MMD, or more correctly, how to convert VRM models to PMX.

What is VRoid Studio?

VRoid studio is dope and you can Download it Here. In the most simple terms, it’s like a doll maker for programs like VRChat. You can play with sliders and edit textures to create your own models. For me, a big thing is that the program is portable, meaning no installation. There are a ton of tutorials for all aspects of VRoid Studio, so I’ll just skip to the end.

Once you are done making your model or editing a preset, you need to go to the “Camera / Exporter” tab and choose “Export” in the side bar. Once you are there, just click the “Export” button right above the “Export Hair to OBJ (Quad Mesh)”

If the model is one hundred percent for your personal use, you can ignore the window that pops up and just press “Okay”. All of that stuff really only applies if you are uploading to VRhub, a service hosted by Pixiv that allows you to share and download VRM models.

How to Convert VRM Models to PMX Models

It’s impossible for an average American to download the software you need from the creator of the software as it is hosted on Baidu. It would be possible if you bought a Chinese phone number for it, but I don’t think many people would even know where to start with that.

I was lucky enough for a nice lady to show me a copy of the software with a Japanese ReadMe file on BowlRoll. Bowlroll is a popular Japanese file sharing site. The nice lady sent the link over DM as opposed to as a reply, so I have a feeling I’m not supposed to share the link. So instead, I’ll send you on a scavenger hunt!

The first part is the easiest. You just need to find the password! Go to the VRM to PMX Converter’s home page and look under where it says “Download”. The password is in that section. (This is probably too much of a hint, but the password isn’t in Chinese.)

Now that you know what the password is, open up BowlRoll. Search for “VRM2PMXConverter” (without quotes) and you’ll find it!

Using the Converter to Convert VRoid Studio to MMD

This program is also portable and doesn’t require an install. I was a little dishonest with the title, however. It instead takes three clicks. After loading in the VRM file, you should see an avatar of your VRM file and the option to convert to PMX will be available.

The converter can take a bit of time to convert, but that’s barely a con when it does almost everything you need to directly put your VRoid Studio model into MMD. The file with the PMX model is placed in the same directory as the VRM model in a folder called “PMX Export”. Because of that, it may be a bad idea to convert all of your models in the same folder.

Sorry for the choppiness!

As you can see, all of the physics are preserved! For a lot of people, the article ends here. You did it! For other people, there are a few changes that need to be made.

Make Bone Groups

In a previous article, a reader asked why there were no diamonds in the bone panel in MMD.

Bone pane from unrelated model

In the conversion process, no bone groups are created for the new model. For people who only use premade motions, this is no issue. If you make your own motions, however, taking a look at this article may be helpful.

“Tearing” Clothes after Convert from VRoid Studio to MMD

One of the problems that seems the biggest but has a really simple solution is the body poking out from behind the clothes.

I wrote about this previously with my Camila model. All it takes is deleting the parts of the body that will always be hidden behind the clothes to fix it. The best way to do this so that there isn’t any crazy jagged lines is to use the “Knife” tool in the “Adv” popup in PMX Editor, cut out a section. Then, select all of the vertices you want deleted. Either press “Shift + Del” or go to “Edit > Vertex > Delete Vertex” in PmxView.

The Facial Panel

If you only use premade motions, again, this is no issue. However, if you make your own motions… I’ll let you judge if this is an issue for you.

This part will not be as much laborious as it will be tedious. English names don’t matter at all, so you can name the morphs anything that will help you track them down and use them. To rename them, you just need to go to the “Morph” tab in PMX Editor and make sure the “EN” button is checked.

Then, you can name the morphs anything that will make your life easier! You can also rename the English names for bones and the materials if that makes your life easier also!

Have Fun With Your New MMD Models!

Hopefully this article opened some eyes about the possibilities of using VRoid Studio to make MMD models. While there aren’t many clothing or accessory options as of now, it is a lot easier than piecing together a model from parts on dA!

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UPDATED NOTES 6/21/2021

1/29/21…. a note from reader: Teale

Hello & thank you for this guide! I have used this method to get my vrm model into mmd. There are youtube guides that reference the need to modify / rename the root and center bones to center and groove bones, alas whenever I try to modify these bones the motions appear to be glitched. Overall, with the VRMtoPMX Converter I am able to do most motions ok without editing any bones in the PMX editor, and though some hair textures are incorrectly rendered (approx. 5 out of 100), the model’s appearance is acceptable.

I’ve been having difficulties with lower body motions, aka certain leg physics are problematic. When the model kneels or swoops down her knee ends up below the floor or through the middle of her back. The example motion that yields these results and associated links are referenced below. I’m seeing this issue with the first motion in the main directory, which is the front position at the motion start. Perhaps you wouldn’t mind trying it out and lending me your thoughts. Thank you very much!

https://www.nicovideo.jp/watch/sm31198552
https://www.nicovideo.jp/watch/sm32511660
https://bowlroll.net/file/155865

Note: I found that using the latest release of vroid studio (v0.12.1) and making a new vrm model from scratch does not have this issue, at least not to such an extreme degree. Thanks again for the info!

1/31/21 LearnMMD’s May Blythe replies:

I’m so glad that the update fixed the issue :D !! My eyes were getting glossy trying to figure out what step to take first to troubleshoot!

6/21/21…. Teale

Dealing with hair textures… unwanted black/metallic
Hey there,
I’ve learned more about this now. I was under the impression the new models were fixed, but when I tested the issue, I didn’t go through the full process of creating a VRM model. So I didn’t actually mod the hair in the way that causes the issue b/c it was a quick test.
The VRM2PMX converter changes the hair texture from the single base color you use in VroidStudio to a 3 panel PNG. On the left third you have your base color, the Middle section is the metallic part (which is the undesired black texture that you get after converting your model), & the right third is the normal map.

I found several fixes, but first you need to understand the problem.

Basically people with this issue are using the offset setting to move the texture and avoid the clone stamp look. if you never change your offset your converted model will not have any metallic black strands. I’m guessing that anything with an offset of 30-50% or more will assign the hair the wrong basecolor and also give it a metallic texture.

The best fix I’ve found is to bring the model into blender and grab the hair vertexes and physically move them to the left third of the texture (ie: F00_000_Hair_00_HAIR_01.png), blender also allows you to use smoothing which will omit the harsh polygons you get. This is especially noticeable on the metallic strands. Even if you swap the textures or replace the black part of the texture with a duplicate base color, the hair will still be metallic / shiny on your PMX model.

Hope this helps others that experience this issue, and that the LearnMMD team has a better idea of this issue.
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Thank you, Teale… great info… thanks for all…
Reggie

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