Select the Center Bone if your MMD Model Doesn’t Feel the Floor

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Why does my MikuMikuDance model go through the floor. Why does it seem that my model can’t feel the floor. I move the center bone but her legs don’t bend, she goes down through the floor.

Why does my MMD model not bend at the knees when I move the center bone?

This is one of those questions that bugged me for the longest time. Some models I would download did not bend at the knees … and, instead, would sink through the floor. They were Japanese models and I could not read the bone list. I just figured that the top entry on the bone list was the Center bone. I’d highlight that bone on the list and move the Y roller, only to see her pass through the floor rather than bend at the knees.

I tried registering the Leg IK bones at floor level and … no difference.

You’ve been grabbin’ the wrong bone!

It turns out that it was the Mother Bone that was being selected, not the center bone. If you select the mother bone, you will move the whole model … that’s what that bone does.

Be sure to select the Center bone … Click then SELECT button and the click on the center bone that you see between the legs near the waist; not the one near the floor. It is that easy!

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