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Is it possible to do transparent meshes with blend modes, like this? enter image description here

Add/addition mode in image editors and game engines looks like this. When shapes overlap, it gets brighter, and dark colors are not visible. enter image description here

John
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    Hello, yes you can, what difficulty have you met? – moonboots Jul 18 '21 at 19:00
  • I don't know how to do it at all, I only know how to apply transparency, not blend modes like add. – John Jul 19 '21 at 19:06
  • what effect would you like to do exactly? maybe give a precise example – moonboots Jul 19 '21 at 19:08
  • Like in the image above. A texture applied to a plane, and it's displayed over top of things like it would be in image editing software set to add, multiply, etc mode. – John Jul 20 '21 at 10:08
  • Yes. Bonus: use alpha hashed for best results where one transparent thing is in front of another in the same mesh object. – TheLabCat Jul 18 '21 at 23:48

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Edit: So as you've reformulated your question it looks like my answer is not correct anymore, anyway I leave it as it is.

If you're talking about the light beams, here is what you can do:

enter image description here

It's a ColorRamp plugged into an Emission that goes on the Z axis. Also you need to put a transparent gradient and some noise. Don't forget to go into the Material panel > Settings and Blend Mode > Alpha Blend:

enter image description here

You can transform the shape with a Lattice modifier for example.

moonboots
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  • That's close but it's not the same effect. I need to be able to use textures, and add mode looks different than setting something to emissive. – John Jul 21 '21 at 19:30
  • hello, please edit your question and be as much precise as possible in your question, it lacks precision for the moment imho – moonboots Jul 21 '21 at 19:32
  • Added more info. – John Jul 21 '21 at 19:41
  • You see the list of modes in the color mix node? Those are all ways of displaying one color over another. They all handle how the colors blend differently. All of them are different than taking a transparent image and making it brighter/produce light. – John Jul 21 '21 at 19:50
  • It's just blend modes, it's not really a specific effect. If you go into photoshop or other image editing software and set a layer to "add" or "addition", that's what it is. – John Jul 21 '21 at 19:56
  • ok so it's how the emissions of different planes cumulate? – moonboots Jul 21 '21 at 19:56
  • Yeah, https://i.gyazo.com/3338e1988ab7470b4793cc37a635f317.png – John Jul 21 '21 at 19:57
  • Well actually, no, there is no emission involved in the literal sense. Blend modes just effect how the colors interact in general. – John Jul 21 '21 at 19:58
  • you can do it within the same material with the different MixRGB node modes, I don't know if you can do it with separate planes – moonboots Jul 21 '21 at 19:59
  • That said, it doesn't seem easy within one material either, I hope someone will tell... it must be possible through the Compositor but it will be tedious, it all depends on your scene I guess – moonboots Jul 21 '21 at 20:33