Here is the first attempt to create a morph to show ribs on G3. It includes the vertical line up the stomach, not sure what it's called.

It's actually the negative of the morph. The morph pulls out the mesh. Applying it negative pushes in the mesh. Sometimes, pulling out looks better, but I have to separate the vertical line from the ribs morph for that to work.

Problem 1: Too straight.

Problem 2: I have to re-make it because I didn't save the object from zBrush. Maybe there's a way to save the morph from DAZ so it can be applied to other figures.

Problem 3: Too thick, but the thickness is based on the distance between nodes.

It's not a bad first attempt.

A detailed ribs morph would require HD morphs. A good normal map plus the basic rib morph should look good enough for most renders.

What's the basic rib morph. The only ones I know of expand the rib cage without defining the ribs.

What's a HD morph vs a morph?

An HD morph is applied to the sub-divided mesh, not just to the base mesh, and so allows more detail (it's the same as a displacement map for Iray purposes, but not dependent on the UV set used). The tool(s) for creating HD morphs are not available to us however, only to Daz PAs.

Sorry, I think the ribs morph I have probably comes from a character set not the general Body morphs package.

Do you know what character set it is?

I followed this tutorial, but nothing is saved when I export the maps. For me, nothing is drawn on the figure, either. It just pushes the mesh in if I drag. Not sure what I'm missing.

https://www.youtube.com/watch?v=jikN3dPlUts

I think you better study your anatomy closely, ribs do not appear along the side of the abdomen on the lower torso. That area is generally covered by the oblique muscles.

Yes, I went too low with them. But they're too thick anyway. I'm working on learning how to make normal map - so far without results.

Regarding the normals tutorial, she didn't mention that tangent has to be selected in the options.