I have an object that bends over onto itself. Its one color with some transparency. See Image. The left portion is like a string that has bent around in front of itself.

Right now, when the object overlays itself, it gets darker which makes sense.

But what I want is for it to get brighter. I guess like an additive overlay? Or maybe it would be subtractive?

I've tried a bunch of combinations of shaders (mainly emission/mix shaders) and I can't seem to make it lighter. I did get it somewhat working with a black background, but I have to have a white background.

Can I make the overlap region 'brighter'?


I'm using blender 2.79. Cycles Render Engine.



This is what I'm currently using in my nodes plus a bunch of other things I've tried that didn't work. You can see at the bottom just a mix shader with transparency and glossy BSDF. But none of the other things I tried there made it any better (all were worse, actually 1 was decent, but only if on a black bacground).

enter image description here

  • $\begingroup$ Answers will greatly depend on what render engine you are using, which you never mention. Please edit your question and add missing details $\endgroup$ Sep 21, 2017 at 0:05
  • $\begingroup$ Updated, thanks! I should have mentioned I was using cycles. $\endgroup$
    – Nertskull
    Sep 21, 2017 at 0:08
  • $\begingroup$ Do you want the object to actually emit light? Can you also show us your current node setup, maybe a screenshot of what you tried? I don't think what you want to do is possible at least specifically as "blending modes" since materials in cycles can't depend on the render solution. Maybe it can be faked with a smart combination of shaders. Have a look at the Add Shader node instead of the Mix Shader $\endgroup$ Sep 21, 2017 at 0:22
  • $\begingroup$ @DuarteFarrajotaRamos added my nodes. It can emit light. That would be okay. Right now it doesn't. But if it did emit light, that would not be a problem. I tried messing with emission a few times, and couldn't figure anything out that worked. $\endgroup$
    – Nertskull
    Sep 21, 2017 at 0:42
  • $\begingroup$ It’s a double thick occlusion of the light. Not sure what you expect here. Violating the basic idea would most likely head into the uncanny. $\endgroup$
    – troy_s
    Dec 20, 2018 at 1:43

1 Answer 1


You can try to tune this simple material setup:

enter image description here

This example is based on the simple idea covered at this post: https://blender.stackexchange.com/a/88356/13643

  • $\begingroup$ So, this works if the world background is black/dark. But if you make the world background white (which I need), it does the exact opposite, and makes the overlap area darker. $\endgroup$
    – Nertskull
    Sep 21, 2017 at 17:19

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