Particle Info Node Does Not Consider Time Remapping #77307

New Issue

Atomic · 2020-06-03T15:14:33+02:00

Atomic commented

2020-06-03 15:14:33 +02:00

System Information
Operating system:version: 2.90 (sub 0), branch: master, commit date: 2020-05-08 16:22, hash: 6f985574b7, type: Release
build date: 2020-05-08, 21:30:40
Graphics card: gtx660

Blender Version
Broken: (example: 2.80, edbf15d3c0, master, 2018-11-28, as found on the splash screen)
Worked: (newest version of Blender that worked as expected)

Short description of error
Particle Age Attribute Is Wrong When Time Is Remapped

Exact steps for others to reproduce the error
Open the attached file and activate Rendered viewport shading (Cycles).
Scrub the timeline and you'll see the the particles inherit colors based upon their age.
Press F12 and you will discover that all particles are rendered green. This is because the OLD field in the time remapping section is not equal to the NEW field.
If you set the NEW value equal to the OLD value, the colors render correctly.

The attributes presented by the particle info node should take into account the time remapping values.

OR

Better yet, why don't we have a Timeline info node that provides basic information about the start, end frame, fps and time remapping? If this node existed more complicated node graphs could be crafted.
Particles2 - Copy.blend

**System Information** Operating system:version: 2.90 (sub 0), branch: master, commit date: 2020-05-08 16:22, hash: 6f985574b775, type: Release build date: 2020-05-08, 21:30:40 Graphics card: gtx660 **Blender Version** Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen) Worked: (newest version of Blender that worked as expected) **Short description of error** Particle Age Attribute Is Wrong When Time Is Remapped **Exact steps for others to reproduce the error** Open the attached file and activate Rendered viewport shading (Cycles). Scrub the timeline and you'll see the the particles inherit colors based upon their age. Press F12 and you will discover that all particles are rendered green. This is because the OLD field in the time remapping section is not equal to the NEW field. If you set the NEW value equal to the OLD value, the colors render correctly. The attributes presented by the particle info node should take into account the time remapping values. OR Better yet, why don't we have a Timeline info node that provides basic information about the start, end frame, fps and time remapping? If this node existed more complicated node graphs could be crafted. [Particles2 - Copy.blend](https://archive.blender.org/developer/F8574196/Particles2_-_Copy.blend)

Atomic commented

2020-06-03 15:14:33 +02:00

Added subscriber: @AtomP

Philipp Oeser commented

2020-06-03 15:45:20 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2020-06-03 18:04:44 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-06-03 18:04:44 +02:00

I tried looking into this a bit and noticed a couple of things:

rendering is wrong, yes
I think the remapping values are actually taken into account [if you have old<>new 100<>50, and compare scrubbing to 400 instead of 200 the results are actually the same]
however, there is something weird going on with updating here
when in the timeline scrubbing, pressing the mouse (not releasing!) somewhere in the timeline will most certainly yield to "wrong" (green -- same as rendering) results, yet when you release chances are good that result return back to the correct result.

This might help tracking down where the updates in the timeline as well as rendering might go wrong, needs further investigation...
note: change_frame_applyis done in both modal as well as confirming when scrubbing in the timeline

If this was just about particles, I would not hold my breath here [since particle nodes are around the corner], but this might also be an issue with setting CFRA (current frame) elsewhere?

I tried looking into this a bit and noticed a couple of things: - rendering is wrong, yes - I think the remapping values are actually taken into account [if you have old<>new 100<>50, and compare scrubbing to 400 instead of 200 the results are actually the same] - however, there is something weird going on with updating here - when in the timeline scrubbing, **pressing** the mouse (not releasing!) somewhere in the timeline will most certainly yield to "wrong" (green -- same as rendering) results, yet when you **release** chances are good that result return back to the correct result. This might help tracking down where the updates in the timeline as well as rendering might go wrong, needs further investigation... note: `change_frame_apply`is done in both modal as well as confirming when scrubbing in the timeline If this was just about particles, I would not hold my breath here [since particle nodes are around the corner], but this might also be an issue with setting `CFRA` (current frame) elsewhere?

Kevin S. commented

2020-06-03 22:25:10 +02:00

Added subscriber: @Ifandbut

Kevin S. commented

2020-06-03 22:25:10 +02:00

when in the timeline scrubbing, pressing the mouse (not releasing!) somewhere in the timeline will most certainly yield to "wrong" (green -- same as rendering) results, yet when you release chances are good that result return back to the correct result.

Can confirm on Blender 2.83.

``` when in the timeline scrubbing, pressing the mouse (not releasing!) somewhere in the timeline will most certainly yield to "wrong" (green -- same as rendering) results, yet when you release chances are good that result return back to the correct result. ``` Can confirm on Blender 2.83.

Jacques Lucke commented

2020-06-18 13:02:21 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-06-18 13:02:21 +02:00

Just for quick reference, this is what is happening:

2020-06-18 13-01-10.mp4

Just for quick reference, this is what is happening: [2020-06-18 13-01-10.mp4](https://archive.blender.org/developer/F8630060/2020-06-18_13-01-10.mp4)

blender-admin commented

2021-08-13 13:31:21 +02:00

This issue was referenced by 23132fcdc1

This issue was referenced by 23132fcdc136d1238d9980c2a9bf6d058e846cc7

Kévin Dietrich commented

2021-08-17 21:42:57 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Kévin Dietrich closed this issue

2021-08-17 21:42:57 +02:00

Kévin Dietrich self-assigned this 2021-08-17 21:42:57 +02:00

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Particle Info Node Does Not Consider Time Remapping #77307