I stuck this in the zbrush forum, and I decided to post it here as well.

Got a question:

I have the m3 base obj file, and a m3 obj file that has been morphed.
Now I want to use zbrush to use the 2 files, and make a displacement map.

I know how to bring in the m3 obj base file into zbrush, save it as a morph target, morph the mesh, then use both meshes to create a displacement map in zbrush.

But not how to do it with a unmorphed base mesh, and the mesh morphed in another program.

Are you trying to do the steps in a different order, or are you trying to end up with a generic displacement map that can be used with any morph?  Basically a displacement map is just a grayscale map where white = HIGH, gray = NEUTRAL, and black = LOW.  You don't really have to do this in Zbrush at all, athough it is easier to see the result.

Um what I'm trying to do just as an experiment is as follows:

1: Load into  poser m3, and apply a  full body morph to it (Lets say muscular as an example).
2: Export the morphed mesh out as m3mus.obj.
3: Somehow import the m3 base mesh, and m3mus.obj into zbrush, and make a displacement
    map.
4: Export the displacement map as m3mus.jpg.
5: Load into poser m3, and apply the displacement map m3mus.jpg, and see if I can get m3
    to look like I applied a full body morph to m3. (step 1)

Um really, any program that can make displacement maps is fine. Just that I happen to have
zbrush installed on my pc.

Um well I guess you're not interested in what I was telling you, um ok good luck um

Thanks for the info you gave me. I did not want to appear rude, or anything. I've just been fixed on this for a couple of days.

Have you tried layers? You can load the unmorphed mesh as a layer and then load the morphed mesh as a second layer then use the slider to morph between the two, having saved a morph target on one or the second layer. Is this what you mean?

I guess I said that backwards, you want to load the morphed mesh as the first mesh into Zbrush then the unmorphed as the second, mesh.

Thanks much. I did not think of that. Kind of a newbie with zbrush.