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I'll apologize in advance if this is an lame question or if I've missed an obvious step in this process, but I only just started using Blender and Unity yesterday, so to say I'm green would be a massive understatement.

Anyhow, my end goal here is that I'm setting up a model to import into Unity to then export as an avatar for VRChat. I've successly uploaded six avatars so far, all performed well while in use. However, each of those models were already rigged, which made configuring them in Unity infinitely easier. Now, I recently downloaded an .fbx of Prophet from Crysis. Upon opening the scene in Unity, I realized it had no skeleton, and so I imported it into Blender to begin rigging. Creating bones seemed relatively simple, but when I parent the mesh with the armature and attempt to test posing, chunks tear away -- and in some instances it even affects areas in unrelated parts of the mesh, like the upper leg pulling chunks of the shoulder when rotated.

Before posing: Before posing

After posing: After posing

Before Posing Before posing

After posing: After posing

I've not yet manually weighted anything, I simply set parent with automatic weights. I thought maybe if I went in and specified weights that some of the issue might get resolved, but it either did nothing or made things worse.

Any advice would be immensely appreciated. I've tried to do my own research before asking for help, but Youtube and Google have proved unhelpful in this circumstance.

Here is a link to the .blend file if that would make figuring this out easier: http://www.mediafire.com/file/5dj5qbojbfcsjtu/prophet.blend

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    $\begingroup$ After a quick look, I think an issue is that your mesh is composed of a bunch of disconnected islands. I think this screws up the automatic weighting, and I'm not sure even manual weighting will really make it work right. As an experiment I tried remeshing your mesh (with the Remesh modifier, which I then applied) and then parenting it to your armature with automatic weights. Everything worked more or less as expected. Of course the Remesh modifier will not give you clean topology, linking your mesh islands properly may take some work. $\endgroup$
    – risingfall
    Commented Feb 10, 2018 at 22:36
  • $\begingroup$ @risingfall Thanks so much! I'll give this a try and see where I can take it from there, anything at this point would be better than the mess it's currently in. Much appreciated. o/ $\endgroup$
    – NOVAXIS
    Commented Feb 11, 2018 at 1:40

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As indicated in my comment, your problem seems to be loose geometry. I found I could clean it up fairly easily by selecting all vertices of your mesh in Edit mode, then choosing Mesh-->Clean Up-->Remove Doubles and specifying a "Merge Distance" of .06. I can't tell whether that took out details of your mesh that you wanted to keep, but this resulted in a mesh without loose parts. Re-parenting the mesh to the armature with automatic weights made everything work as expected. You could try playing with the Merge Distance of the "Remove Doubles" command if parts of your mesh are getting oversimplified.

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