Hi,
Today I wanted to sculpt a rough Giraffe rib cage and I found the mask lasso brush, the split hidden tool, and the extract with thickness tools extremely helpful for this.
As shown below i first used the mask lasso tool to select ribs. I used alt to make the mask selection more defined. I then used isolate polygroup technique to isolate the ribs then i split hidden to put the ribs a new tool.
Now with the rib outer edges made i used the subtool extract feature
varying thickness (experimented with various thickness) to get thickness of the rib cage. And last I
dynameshed then zremeshed the mesh.
Hope you find this technique helpful.
cheers,
Nate