We have already seen the LoopTools add-on in Chapter 3, Polygonal Modeling of the Character's Accessories. This incredibly useful Python script can even be used for the re-topology!
If the LoopTools add-on isn't enabled yet, perform the following steps:
Gidiosaurus_retopology.blend
file.In the LoopTools add-on, there are at least three tools that can be used for the re-topology: Gstretch, Bridge, and Loft (the last two seem to have almost the same effect so, at least for our present goal, we can consider them to be interchangeable).
Let's first see the Gstretch tool:
Yes, it's that simple; it's enough to stroke the target position line and the new extruded vertices will be moved to that target position.
Also, now let's see the Bridge and the Loft tools:
It's not mandatory to duplicate new edges, it's enough to select the same number of vertices in the two edge-loops to be connected; here, after the Bridge tool operation, we have set the Segments value to 3:
You can repeat the operation and the add-on will keep the last values you entered.
Repeat the steps, and this time click on the Loft button. The effect is almost the same, but if the new faces come out really messy, just click twice on the Reverse checkbox in the last operator panel; this should fix the issue.
You can then use all the other buttons to refine the added geometry; in the following screenshots, I tweaked the new geometry a little bit by selecting the horizontal edges and clicking on the Space, Flatten, and Relax buttons:
Using a mix of all the previous methods, in a short time, we have completed the head and the joining of the neck of our Gidiosaurus_lowres mesh; as you can see, particularly in the second screenshot at the bottom, the technique of following the main features and folders of the sculpted surface with the edge-loops can highlight the organic shapes even with a low resolution mesh:
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