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I created a human body shape in blender. I need to show veins or organes in that body but still be able to reconise that it's a body. I tried glass but a glass body look's strange and is full of reflections. Any idea in wish direction to take this ? I'm trying to get something kind of like that :

enter image description here

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    $\begingroup$ blender.stackexchange.com/a/28423/1853 $\endgroup$
    – user1853
    Commented Mar 7, 2019 at 6:25
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    $\begingroup$ @MichaelBenDavid just use the proposed node setup on the outer layer of the skin. The other objects could use other materials depending on the desired effect. i.sstatic.net/92Yjt.png and i.sstatic.net/lA4a2.png $\endgroup$
    – user1853
    Commented Mar 7, 2019 at 7:21
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    $\begingroup$ Possible duplicate of How to render a mesh transparent with a color on its edges only, with nodes? $\endgroup$
    – Rich Sedman
    Commented Mar 7, 2019 at 8:42
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    $\begingroup$ Doesn't look like a Duplicate Q to me. I don't think this is the ghost effect done with fresnel. This looks more like a negative film effect where shadows are the bright parts. Probably a better solution to this using compositing nodes and render layers than shader nodes. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Mar 7, 2019 at 12:57
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    $\begingroup$ Try the AO node in 2.8 that you can invert to drive the transparency and color to get this "x-ray" negative film effect. $\endgroup$
    – Jaroslav Jerryno Novotny
    Commented Mar 7, 2019 at 13:29

2 Answers 2

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final

This method is working suprisingly well in EEVEE. It's fully real time (fast, very fast). In Cycles also. And it is very flexible.

eevee

Material setup

Basically it is mix between Emission and Emission Transparent shader.

I've used Normal input to drive Facing Blend value, this is for making "highlights". Color Ramp is for fine tuning intensity of those highlights. By rotating sphere inside Normal node you can achieve many interesting setups. The one from example is pointing downwards.

Normal

Fresnel is used to make a bit of an outline around object.

nodes

EEVEE

To make it work in EEVEE you need to change material Blend Mode to Alpha Blend and turn of (if you need it) Show Backface.

eevee

Cycles

For Backfacing in Cycles you can use this setup. It's not working as well as in EEVEE but it is still good.

cycles

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Using a matcap works in eevee and cycles, allows fast renders and simple setup.

I'm also using the same matcap image as a mask for opacity and color.

matcap setup

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