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Prompted by my previous question, Is it possible to see the output of a node group like this one: (created from this tutorial on blender cookie)

node setup image

Nod group output

as a easy to visualize (and quick to render) black and white map like this?:

enter link description here

Simply connecting the output of the group to an emission shader does not let rays through the object, so the output is white:

enter image description here

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2 Answers 2

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Connecting the emission shader directly, as you suggested won't work indeed, but how about mix of transparent and emission depending on Geometry->Backfacing? Should work.

Edit: Works for me: enter image description here

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  • $\begingroup$ Just tested, doesn't seem to work. $\endgroup$
    – gandalf3
    Commented Oct 29, 2013 at 20:39
  • $\begingroup$ Edited the answer. Like this? $\endgroup$
    – kivig
    Commented Oct 29, 2013 at 20:58
  • $\begingroup$ It still seems transparent though.. $\endgroup$
    – gandalf3
    Commented Oct 29, 2013 at 21:01
  • $\begingroup$ It's not. It does illuminate scene, though. But that can be solved by adding another mix with diffuse for non-camera rays $\endgroup$
    – kivig
    Commented Oct 29, 2013 at 21:03
  • $\begingroup$ I must be doing something wrong.. With this node setup I got this. $\endgroup$
    – gandalf3
    Commented Oct 29, 2013 at 21:57
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One way is to connect it to a Transparent shader:

enter image description here

This renders a little bit faster than a Glass shader.

It can also help to go into local view (Numpad /)

However, this does not give a black and white result.


If anyone can find a faster method or a way to get a black and white result, please post it :)

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