Quote - I would like to add a light or modest amount of thin blue vein detail to some areas of V4 for the sake of realistic detail, but can't find anything in DS4 to do that. I'm wanting realistic thin blue veins for upper chest & neck area, lower leg area and arm & hands. Just slightly larger veins for forearm & hands. I'm not rendering a female bodybuilder, just a petite, feminine, early 20s young woman. I've been thinking lately that a modest or slight amount of vascularity for women is the one thing that's missing in 99+% of the V4, S4 & A4 models out there.

Visible veins come in a handful of categories: varicose (which bulge in curled shapes but do not have color), bodybuilder veins (which are straighter than varicose, bulge but again do not have visible color), spider veins (which are colored but do not bulge and aren't what you're describing), and finally "pale girl blue veins" which are comparable to the ones women often discover in the same places and on their breasts when they're pregnant and/or breastfeeding (the latter because those veins are enlarging but again not bulging).

This last category doesn't bulge and therefore wouldn't affect contours and require a bump or displacement map/node.

What you're looking for is a set of shader nodes in Poser or DAZ|Studio where the skin's map looks for a vein map and converts darkness on the vein map to translucency on the corresponding region of the skin map, ideally leveraging subsurface scattering to make the veins NOT look like they're being painted onto the skin map but live below it. If this character were older, you could consider visible veins with a small degree of pigmentation on the wrists and backs of the hands but again that's typically the forties and later. Youthful characters retain enough "baby fat" in places like those to make those veins less visible.

I've been out of practice for a while but that's what you're looking for.