does anybody have an idea how i can make one of my v4 characters into a hologram?  I use poser 11 pro. I have tried making all the body parts see through but that has weird problems with the head parts. so now I'm at a loss. 

Firefly or Superfly?

Firefly

In case that could interest you: that's a very simple setup I used at the time of Poser10, and it seems to work with Poser13, firefly and superfly. This lies in a closed room, no lights

firefly:

and it works on superfly as well:

I don't remember exactly how I stumbled upon this setup, I just remember that I got inspired by the creation of an online-friend that was using C4D for a similar effect. I should revisit this setup, I'm pretty sure that it can be enhanced.

You can also check out this thread for ideas.  Ghost Script

thanks Y-Phil   i will have a play over the weekend. this is for my comic i'm working on so when used it will need to be in a bright lit sci-fi lab but if i can just work out the base i can sort the other problem later.

I checked out the ghost script thing but that only works for the pauline figure it seems. I need to use v4

Like this?

You'll have to uncheck "Visible in Raytrace" for the body (or the various Body Parts actors) OR set Raytrace to 0 bounces.

Otherwise the figure will be "see-through"

Yes, Joe public has essentially suggested what I would. Apply similar materials to clothing for a clothed hologram or ghost.  There are some additional tricks that could push up the apparent luminosity of the hologram using a probe light on the alternate diffuse, and some clever math subtract on the ambient.  I think the math trick is in the ghost thread linked earlier, I believe the probe light trick can be found in tutorials at Castle poser.

A hologram is a projection of the outside appearance of a person not in the room.  Best treat it that way: render hologram figure separately on transparent background and use it on a billboard figure in the final scene. Set the 'ghostiness' of the hologram via transparency and blur. Input via ambient only. Diffuse, specular etc. all zero/black. A holographic projection is not affected by scene light. 

Make billboard face camera. Use magnets on the billboard geometry to create distortion of the projection. Play with z-depth render image plugged into the IOR channel to create distortion of the background for the spooky effect. In Firefly try z-map and displacement.  

To turn a scene figure into a semi-transparent hologram you would have to take out all internal geometry and all backfacing polygons; quite a challenge and probably not worth the effort.