【Question】About blending

Questions
1

Hi！
I have a scenario,which involves smoke and fire.
I code them respectively with shaders and points.
Smoke use alpha blending and fire use additive blending.
So alpha blending equation is

SRC*alphaFactor + DST*(1-alphaFactor)

additive blending is

SRC*1+ DST*1

It may happens to one pixel that needs to render both of them.
in this case , are they shares the same input frag color or one of them s out frag color is the other ones input frag color?
I don’t know if there’s any problem with that but the thing is that the fire is too bright.It covers the smoke instead of blocked by the smoke in front of it.

2

are you sure it is in front of it ) I mean, specific smoke particle may be in front, but the whole smoke object may be decided to be behind and drawn 1st.

3

Im confused ,i dont know which one draw first. it’s about the timeline i call them?

4

I think it s based on origin coords but you can turn it off and specify your order somewhere.

5

Yeah,but how? three.js docs
I looked into shaderMaterial but seems not in there

6

https://threejs.org/docs/index.html?q=renderer#api/en/renderers/WebGLRenderer.sortObjects

7

https://threejs.org/docs/index.html#api/en/core/Object3D.renderOrder