Particle Info data not processing #69370

New Issue

brigitter wente · 2019-09-01T01:25:23+02:00

brigitter wente commented

2019-09-01 01:25:23 +02:00

System Information
Operating system: Ubuntu 19.04
Graphics card: Nvidia Asus RTX 2080ti

Blender Version
Broken: (blender-2.80-linux-glibc217-x86_64)
Worked: (optional)

Short description of error
While using a smoke simulation within the particle system, the domain material cannot factor the particle age/lifetime

Exact steps for others to reproduce the error
Create a smoke simulation
Create a particle system
Use particle system as source of smoke
Add a principled volume shader to domain
Try and use particle info such as age/lifetime to control the brightness emission from shader.
(more or less)

I have been at this for a couple of days and I simply cannot get the particles age/lifetime to factor the brightness of emission.
This is for a cloud simulation, if this bug cannot be fixed is there any suggestion in how to make the particle "fade in", using the life time or age on the density would also work to fade in however the particle data seems to be lost somewhere.

**System Information** Operating system: Ubuntu 19.04 Graphics card: Nvidia Asus RTX 2080ti **Blender Version** Broken: (blender-2.80-linux-glibc217-x86_64) Worked: (optional) **Short description of error** While using a smoke simulation within the particle system, the domain material cannot factor the particle age/lifetime **Exact steps for others to reproduce the error** Create a smoke simulation Create a particle system Use particle system as source of smoke Add a principled volume shader to domain Try and use particle info such as age/lifetime to control the brightness emission from shader. (more or less) I have been at this for a couple of days and I simply cannot get the particles age/lifetime to factor the brightness of emission. This is for a cloud simulation, if this bug cannot be fixed is there any suggestion in how to make the particle "fade in", using the life time or age on the density would also work to fade in however the particle data seems to be lost somewhere.

brigitter wente commented

2019-09-01 01:25:23 +02:00

Added subscriber: @breebee-4

Stephen Swaney commented

2019-09-01 04:41:16 +02:00

Added subscriber: @StephenSwaney

Stephen Swaney commented

2019-09-01 04:41:16 +02:00

It would be nice to have a .blend so we can see exactly what you are doing.

brigitter wente commented

2019-09-01 15:01:08 +02:00

breesmoke54.blend

Thank you for the quick response, here is the blend. You will notice in the animation of the particle/smoke that each particle is born instantly with full emission giving the "glitchy" effect. I have been trying to find a way to use the age/lifetime particle data to "fade in" each particle either with the emission or density or a transparency shader with the particle data as a factor. Essentially the opposite effect that the "dissolve" parameter has on the particles. You can see from frame 1 of the animation to frame 2

[breesmoke54.blend](https://archive.blender.org/developer/F7712944/breesmoke54.blend) Thank you for the quick response, here is the blend. You will notice in the animation of the particle/smoke that each particle is born instantly with full emission giving the "glitchy" effect. I have been trying to find a way to use the age/lifetime particle data to "fade in" each particle either with the emission or density or a transparency shader with the particle data as a factor. Essentially the opposite effect that the "dissolve" parameter has on the particles. You can see from frame 1 of the animation to frame 2 ![0001.png](https://archive.blender.org/developer/F7712947/0001.png) ![0002.png](https://archive.blender.org/developer/F7712949/0002.png)

brigitter wente commented

2019-09-01 18:34:12 +02:00

Here is a more clear example of the data being null. In the first picture you can see (age * 0 = 0) then the second picture (age * 500 = 0) then in the third picture you can see (age + 500 = 500 density).

first

second

third

Here is a more clear example of the data being null. In the first picture you can see (age * 0 = 0) then the second picture (age * 500 = 0) then in the third picture you can see (age + 500 = 500 density). first ![1.png](https://archive.blender.org/developer/F7713086/1.png) second ![2.png](https://archive.blender.org/developer/F7713087/2.png) third ![3.png](https://archive.blender.org/developer/F7713088/3.png)

brigitter wente commented

2019-09-06 18:45:58 +02:00

No one is looking into this after almost a week? Come on guys, let me know if I need to make a direct payment for someone.

Yevgeny Makarov commented

2019-09-06 20:04:52 +02:00

Added subscriber: @jenkm

Yevgeny Makarov commented

2019-09-06 20:04:52 +02:00

I guess you're trying to use the Particle Info node for something other than its intended purpose.
https://docs.blender.org/manual/en/2.80/render/shader_nodes/input/particle_info.html

I guess you're trying to use the Particle Info node for something other than its intended purpose. https://docs.blender.org/manual/en/2.80/render/shader_nodes/input/particle_info.html

brigitter wente commented

2019-09-08 12:17:44 +02:00

Thank you for the response Yevgeny it is truly appreciated. The info node should output a float or integer for age/lifetime and I am just doing math so it should be working from that perspective. In any case it should be verified atleast to be a bug or not, that is important. The only way to control the brightness/density over time of the smoke is with the particle age/lifetime.

brigitter wente commented

2019-09-14 21:19:56 +02:00

...

brigitter wente commented

2019-09-16 00:10:25 +02:00

Someone I am trying to hire says its an issue with eevee particle node, can a developer please just look and confirm? It would truly be appreciated to get some information.

Yevgeny Makarov commented

2019-09-16 14:50:49 +02:00

The Particle Info node can be used in the material node tree for objects that are used as the Dupli Objects, when you use Object or Group render mode of a Particle System...
https://docs.blender.org/manual/en/2.80/render/shader_nodes/input/particle_info.html

The Particle Info node works with Cycles but is not supported for EEVEE.
https://docs.blender.org/manual/en/2.80/render/eevee/materials/nodes_support.html

The **Particle Info** node can be used in the material node tree for objects that are used as the **Dupli Objects**, when you use Object or Group render mode of a Particle System... https://docs.blender.org/manual/en/2.80/render/shader_nodes/input/particle_info.html The **Particle Info** node works with **Cycles** but is not supported for EEVEE. https://docs.blender.org/manual/en/2.80/render/eevee/materials/nodes_support.html

Philipp Oeser commented

2019-09-23 11:17:25 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-09-23 11:17:25 +02:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2019-09-23 11:17:25 +02:00

Philipp Oeser self-assigned this 2019-09-23 11:17:25 +02:00

Philipp Oeser commented

2019-09-23 11:17:25 +02:00

Thanks @jenkm for checking.
If this is just about Eevee + Particle Info Node, then yes, this is not supported.

Afraid we have to close this, thx for the report anyways...

Thanks @jenkm for checking. If this is just about Eevee + Particle Info Node, then yes, this is not supported. Afraid we have to close this, thx for the report anyways...

Christoph Werner commented

2021-07-08 13:53:19 +02:00

Added subscriber: @ChristophWerner

Christoph Werner commented

2021-07-08 13:53:19 +02:00

So there's not yet possible to fade out particles in eevee?
I'm working with 2.93LTS.

So there's not yet possible to fade out particles in eevee? I'm working with 2.93LTS.

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Particle Info data not processing #69370