Basic Geografting, 101: Unicorn Horn
First, a disclaimer- The results from this method contain polygons from Genesis. There are special rules, I believe, on being able to distribute Geographs that contain these polys. I don’t fully know what those rules are, so I consider things made by the method describe here as “for personal use only”. Since I can’t find the thread that explained the legalities- hopefully someone else can fill in the blanks. This is meant to just be a starting point and a “play with this” tut, for better details, I recommend waiting till the geograft tutorial ( I believe by Blondie9999) hits the Daz store.
Found an alternate Tut on this, also, that is worth checking out.. More detailed, and great source:
http://forumarchive.daz3d.com/viewtopic.php?t=184183&postdays=0&postorder=asc&start=0 [Tutorial] Starting out with Geo-Grafting
I’m going to skip most of the modeling aspect for this with just a fast little overview- first, create the accessory that you will want to geograft to Genesis. Bunny ears, mertail, antennae, whatever it is. I will be assuming you know the basics of your modeling program, and how to extract, combine, and merge pieces of your model. You will want a obj of Genesis at base resolution to use in your modeler, also, since we we doing everything at the base resolution through this. I’ll be using Hexagon (free from Daz) as my modeling program here.
Ok, load up the accessory, and the base resolution Genesis figure. Move the accessory to where you’re going to want it to be on Genesis, so that you can see what faces it touches and where it covers. Now we be working on the Genesis figure itself, selecting the faces we will need to copy in order to create the Geograft ring.
In image #1, (note, I colored these areas just to make it easier to explain) the pink boxes are the faces on Genesis where the object itself will be touching. The blue boxes outside of those are the “ring” I’ve refered too. This is a border of Genesis native polygon faces that can not be altered, as far as I’ve seen in doing this. Even moving an inside vertex on those faces will make it so the Geografting fails. They can not be smoothed, sub-divided or anything..so careful with the blue border faces. Copy the Ring and the faces inside of it (in Hexagon,select the faces and press ctrl+c, then crtl+V). Delete the rest of the head, it’s not needed here anymore. Connect the horn in the middle of those ring, again careful not to alter the border- For ease, I’m just using the pink faces to connect in this example. Normally I would delete the inside of the ring, and carefully connect new faces to the existing verts of the ring.
Once you have your accessory (horn, ears, wings, whatever) attached inside the ring, and you are satisfied with how it looks, save the project out as an object file and move into Daz|Studio.
In Daz Studio: Set your Genesis figure to the Base Resolution (Parameters, General, Resolution Level) and then open up your Polygon Group Editor tool.
Import the Obj you made for the Geograft. Use the transfer utility to make it into a conforming figure for Genesis, but do not fit it to Genesis just yet.Just transform it, and leave it unfit. I also switch my camera to Solid Wireframe, to be able to see the faces better.
Image 2: The Geograft item is in blue. Note how the faces of the ring are identical to the face on Genesis. This is important. Now you will hide the Geograft object, and select the ring faces on the Genesis object itself. When you select a face in the Polygon Group Editor, it will turn yellow. Use Ctrl+lft mouse to select multiple faces, and Alt+left-click to remove faces from the selection if you mess up.
Right click these faces, and choose: Polygon Assignment, Set Graph Faces for fitted Figure. In the pop up, choose your new item.
Image 3: With the polygon editor again, choose the rest of the faces inside the ring, right click, and choose Polygon Assignment. This time choose “Set autohide faces for fitted figure”
Basically, the first thing you set up here was the defining the ring, and telling Daz that, ‘when this figure is loaded, these faces will be replaced’. The second thing you just did was tell Daz that when this figure is loaded, ‘these faces should disappear.’
Leave the polygon Group Editor, and fit your new Geograft to Genesis. (Parameters, fit to). The faces below it should disappear, and be a hole when the geograft is hidden from view, and when you change Genesis back to High Res now, the geograft should change right along with it.
Save the Geograft out as a Support Asset, Figure or Prop, and you are done. Poke around, find others ways to do this, but just have fun. 
Some of this may not be too clear..I’m running on an hours sleep :D
Bonus tip? : You sometimes lose your material/Surface zones when working in Hexagon. If you keep the copied Genesis face’s surface area/Material named what it originally was (IE, 1_SkinFace) and are careful to keep that little portions UV intact, you can then apply your figures mat pose to that section of the new Geograft, to make it blend in with the skin textures on your figure. Hopefully that makes sense to texture creators.
