Now that we've got the two main aspects of MMD handled, this area here will be for small tips and tricks, and basic things that will make your life a lot easier when using this program.
How do I remove the outline around a character?
Click VIEW, Thickness of Edge Line, and drop it down to zero.
My shadows look horrible!
Click VIEW, Shadow Settings, and lower the draw distance. Also, certain shaders may result in cleaner shadows, so try adding some shaders to the scene and see what happens.
Why can't I move the character? I can move their limbs but that's it!
Find the center bone (usually a SQUARE [IK] bone) located between the feet, or between the legs (much like GMod/SFM). Click it, then click the "SELECT ALL" button in Bone Manipulation. You'll notice that the lower set of XYZ (bottom right of the screen) options have now become highlighted, and you should be able to use those to move the model as needed.
Why does "insert name" model have a (x) bone?
These are weird, but they're like a secondary 'rotation' bone, usually found on the forearm or leg, and my guess is that they're there to keep a model from looking broken when it's limbs are rotated too much.
How do I save an image?
First, click VIEW and turn off "display coordinate axis". Then go into your camera mode (via model manipulation). Once there, click File, Render to Picture File and you know the rest.
Can I save a pose to use with other models?
Yep! Select the model you're working on, click any bone and then click the 'select all' button in bone manipulation. Now, click FILE, SAVE POSE DATA and name it! Keep in mind that not all models share the same bone rig, so it might not be 100% the same and MAY require some adjustment.
How the hell do I move the eyeballs?
There's usually a bone located above the head that controls the eyes. Alternatively, each eyeball should have it's own bone as well.
How do I change the resolution of my exported image/video?
Click VIEW, Screen Size, then input whatever you want! 1920x1080, 3840x2160, etc. As long as your program doesn't crash when exporting, it'll work. :D
Is there a way to change the model draw order?
Yessir. Click BACKGROUND, then MODEL DRAW ORDER. This is useful if you are messing with models that have transparent textures (like slimes from Dragon Quest), or want certain effects (autoluminous) to have priority over specific models. It takes a bit of getting used to, but it helps.
Where do you find models, props, effects, accessories?
(search for MMD "x", where x = props/models/stages/whatever), NicoNicoDouga (be ready to sign up for an account and get proficient using google translator), Citrusmoothie
, and random Google searches.
Is there an editing program for this?
PMXeditor is the one I use (there's multiple versions out there so you'll have to google it). It's not 100% in english, but it works and there's shitloads of tutorials out there. You can rig, weight, adjust, recolor, adjust textures, spa files, toon files, and all other kinds of weird shit. I've done a few headhacks and palette swaps to get familiar with it, and it's actually pretty damn easy to use.
Does this program only focus on anime girls? Where are my soldiers/guns/robots/gundam/monsters/etc?
Primarily yeah, it focuses on moe anime characters. However, there has been a recent boom in both male characters and all kinds of monsters, vehicles, and melee/gun weapons. You'll often find custom built tributes to other games, characters, or anime series - as well as contemporary ports of more recent game characters. I've even found some Cthulu models, believe it or not.
How is the community?
In a word? Interesting. Lots of OC models, lots of recreations of characters from popular Japanese media, and a LOT of stuff that is password locked. Content creators tend to try and lock down what a model can be used for/whether or not it can be edited/shared, tons of white knights running around yelling at people about their images not following 'rules', and a LOT of drama. When 90% of the community is preteen kids on DA, you know it's gonna be a good idea to steer clear of it; just grab the models, pose, render, and have fun.