single-pass particle render shader

Questions & Answers
1

I want particles to be rendered in a separate layer/pass and then pasted to scene, similar to additive shader.
Sort of like you group layers in photoshop and then set a transparency option to the group itself.

[32729-screen+shot+2014-09-21+at+15.47.03.png|32729]

In this example I show AlphaBlended shader, then the look I want and lastly, the look I can get but don’t want (all particles are adding to each other).

2

Untested, but it sounds like you might be able to achieve this using BlendOp Min with Blend srcalpha dstalpha - Unity - Manual: ShaderLab command: Blend

(That is assuming your background is fully opaque and each of your particles is set to, say, 70% alpha.)