Easy Way to Give Mmd Models Bones
To cut straight to the chase, say you want to take a part of the model and physically 'add' it to another model. This is a very popular tutorial request on youtube. It's not overly hard if you know what you're doing, but sometimes bones weights (or in some cases physics) can get mucked up in the process.
Decide on useable parts
It's recommended that you make copies of the model(s) you want to take parts from, as well as the model you're going to use as a base. For the sake of naming a quick example, have a look at my Kaito 14/Cosplay Len video.
Animasa's Len (the one that ships with MMD) is the base, and Kaito's hair is the part I've added in. The first step was to remove Len's hair (and all of it's bones, physics and joints). Next I had to delete everything off of Kaito EXCEPT his hair (a little resizing was in order, so to make it easier i didn't include hair bones/physics in the first version). A little recoloring and quick eye retexture was all it took.
Remove unused Parts
First, open the material editor in the viewer by selecting (V) and finding it in the menu. In some versions it's (V), but the newer ones may have changed it to (M). If you have the original SlimDX or higher, this is also accessible by using the buttons toward the top right of the viewer/window.
As materials aren't labelled in English, you'll need to see what's what by checking off individual items in the list, and selecting the whole model or hitting Ctrl + A. Any vertices that appear when selected, are part of that material. In PMX Editor, deselected materials are hidden for you.
When you've narrowed it down to the parts you want to transfer, select ONLY the materials you wish to delete in the material panel. The following list is from the default Kagamine Len model that ships with MMD. For the sake of the exercise, let's remove his... PANTS! *is smacked* Okay okay, let's just shave his head bald.
See the materials here? We need to find out which ones are which, in this case, Len's hair. So let's shift our attention to the viewport. In SlimDX, you would need to click on the viewport and hit Ctrl + A to select everything in order to see which materials were being selected. With SlimDX, all you need to do to preview the absence of a material would be to uncheck it in the material panel.
So when we find the right material...
Len should look like this!
LOL!
Turns out, his hair is listed as material number 8, so we can delete everything else in the list BUT that. When everything but 8 is selected, right click in the list and select Ctrl + P (or use that keyboard shortcut) and everything will be gone! Or.. so we thought...
It appears that Len's belt is also using material 8, but we can't delete material 8 without deleting his hair. This is where we have to use a more advanced method. Make sure material 8 (now the only thing in the list) is selected this time.
Now, click and drag to select Len's belt. This is a good exercise for beginners because his belt is pretty far away from his head, so there's very little danger of grabbing more material than you want by accident. Next what you want to do is right click on the material in the list and hit Ctrl + S.
See what happened there?
There are now 2 materials instead of one! This is because we've just split the current material into 2 parts. This is both a handy and a popular technique for editing models, because by cropping parts into sections, you can recolour those areas individually, or you can take them into a different model. If I just took the hair material into a different model, his belt would still be there.
Now that the belt has been cut away from Len's hair, you may now proceed to delete the material it's using. New material is always created under the material it was split from, so remember that when you're choosing which one to select. If you've done it correctly, you'll be left with only Len's hair.
If your model has physics
Don't panic, there's an easy way to get rid of it all (except the parts you want)! Just make absolutely certain you do it BEFORE you go to add the new part to another model OK? You'll save yourself a tonne of time and hassle trying to clean up doubled up physics, which is one of the leading causes of glitching and even crashes! You should also get rid of unneeded bones. I'll explain how.
This next bit assumes you're familiar with how to toggle physical bodies and the two sets of buttons that can preview and/or manipulate them. Once you've got bodies selected, you can just hit 'delete'. Be careful not to select any other parts you don't wish to remove. If you're going to use the drag & drop feature I'd recommend turning off editing for everything but physical bodies.
Source: https://sites.google.com/site/mikumikubeat/tutorials/pmdedit/13
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