Don't need ambient.

He wants realistic.

3DNeo - I'm glad I waited before explaining something you don't want. You mislead by going back to the Star Wars in your request. The Star Wars holograms were all done on a black-and-white TV and then superimposed. Since you said that more than once, I forced the shader to throw away the real colors and make it look like Star Wars.

OK so this is easy. Do what that other thread said:
Enable ray-tracing
Select your figure body.
In the Properties tab, turn off Visible in Raytracing.

Now go into each material of the figure. Turn down the Diffuse_Value to about .6.

Add a Refract node with IOR of 1.0.
Connect that to Refraction_Color.
Set Refraction_Value to .4.

That's all.

You can adjust those ratios of Diffuse_Value and Refraction_Value. The 60% and 40% I did is just one case. You can increase or decrease the effective opacity by adjusting those, but make sure they add up to 1.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)