Some people choose to only deal with porting pre-existing, well established characters (like Mario or something).
In summary, it requires knowledge of 2 disciplines: knowledge of 3d, and knowledge of porting. This is a brief overview on the specifics regarding the creation of custom gmod characters. These must be explicitly stated, and this step is done during compilation. The engine will not automatically make assumptions on how far a characters head can rotate, or the weight of the model. Rules such as collisions, gravity, and weight. Whereas a model viewer (like say, Xnalara), can simply read and interpret a model and display it, Gmod has rules. Remember, these are computer programs, and they make no assumptions. Gmod is a live, physics based environment, and not a model viewer though. Through the 3d manipulation program of your choice, you export your 3d data into the data format native to the Source Engine, which is the 3d engine that gmod runs in. Following this manipulation, you move to the second discipline, the Source Engine, and this is where "porting" comes in. In other words, you first tackle the discipline of 3d, by manipulating 3d though a program of your choice, ie, Blender, 3dsmax, Maya, etc. In your original query, you specified "custom models for gmod." You do so by combining "3d basics" with "Source Engine" specifics. Now, what I listed above are basics of 3d, as in, basics of all 3d models, not restricted to simply "gmod". This may be too in-depth to go into detail here. The mesh and skeleton of models are linked together through a process known as "rigging", or "weight-painting", which assigns a percentage-based value of influence from a bone to a vertice. A person without a skeleton is nothing more than a formless mass of flesh, wouldn't you agree? As you may have guessed, the mesh and the skeleton of a model are linked together -similar to a person and their skeleton. The interconnection of these bones form the skeleton of a model. A bone is simply two vertices connected together, forming a head, and a tail. The skeleton, or rig, of a model, consist of structures called bones. Thats where the skeleton of the model comes in. How do these dots know how to move? For example, these dots do not know what an "arm" is, or a "leg". Now, these 3d points are simply dots connected together in an empty space. Thus, to simplify, 3d characters consist of thousands of small vertices that connect together. Every 3d character, object, or map, is formed of thousands of these triangles, which are composed, as you may know, of 3 points, known as vertices. A mesh is nothing more than structure of triangles, sculpted in a way to form an object. In essence, 3d models consist of two things- a mesh, and a rig, otherwise known as an armature. You seem quite earnest and I figure you deserve a reply, unlike the other worthless snot-nosed idiots that permeate this place.
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