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I downloaded a model (this one, actually http://www.blendswap.com/blends/view/70898) for practicing animation purposes, but i want to add some few features, like sleeves or a nose (because the character doesn't have one) to also practice about textures, so for example i would be able to add a shirt eventhough i can already add one with a plain image alongside the body of the character...but as i said on the title of this question ,the model is already rigged, working with bones, if for example i extrude part of the face of the character, it will be deformed badly and it will appear pretty bad on render, for example, how can i modify simple features without modifing the rig?

I do not only ask this about this model, but of any other model for future reference, i can also rig characters but what if for example, same as this example, i want to modify an already made character that works perfectly with the bones?

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There's nothing wrong in the idea of modifying a character which is already rigged, as long as you know what you are doing:

The character you've downloaded has 134 bones, some deforming, some used as machinary, some constrained and/or related to other bones, some used with drivers, to perform deformations using a lot of shape-keys, expecially in the face (as usual).

Maybe you should start from a simplier character, for practicing, until you reach a good comprehension of what is going on.

Anyway, all deforming bones are related to vertexes, so you can freely edit their materials and textures, without affecting the rig.

Viceversa, if you extrude a vertex from another, it will copy the properties of the previous active one: if the new vertex stays in a similar position, very often there are no problems. A lot of problems generally can come out when shapeKeys are involved (all the face, in your case), in which case the new vertexes can seem to move in weird ways: any vertex modification in this zone probably will need a lot of adjustements in every Shape-Key in which it is involved.

Selecting the rig and entering edit mode you can add new bones, and parent them to the rest of the rig; you will have to create a new vertex group in the character's mesh, with the same name as the new bone, and assign a weight to the vertexes you want to move, for having it deforming the mesh.

Consider also that you can parent more than one mesh to the same rig, even if this solution is not the best, often.

Search for Nathan Vegdahl tutorials serie about advanced rigging, he's the best!

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