Keyed particles aren't affected by size mapping through colour ramp. #88715

New Issue

Don Lio · 2021-06-01T06:14:36+02:00

Don Lio commented

2021-06-01 06:14:36 +02:00

particle problem submission.blend
System Information
Operating system: not relevant
Graphics card: not relevant

Blender Version
3.0.0

Short description of error
One is able to map the size of a particle based on it's lifetime using a texture, but sizes (as well as other attributes) are not affected if the particles are keyed with relations. To re-iterate, the steps below as described work with Newtonian physics, but not keyed.

Exact steps for others to reproduce the error
Create a mesh to act as an emitter
Select your emitter and go to Properties > Particles, click New.
In Properties > Particles > Render, click Object and choose the object that will be emitted as particles and its size.
Duplicate the object and under Particles > Physics > Physics Type, select Keyed
In Particles > Physics > Relations, create two relations and set the two objects you have in your scene as new particle targets
Go to your 3D view and press alt A to launch a preview of your emission animation, then stop it somewhere in its course.
In Properties > Particles > Textures, add New and give it a name.
In Properties > Textures > Type, choose Blend.
In Properties > Textures > Colors, click Ramp.
In Properties > Textures > Mapping > Coordinate > choose Strand/Particles.
In Properties > Textures > Influences, unclick Time and enable Size.
In Properties > Textures > Colors, adjust the Ramp controller to increase or decrease the size of your emitted object over time.

Keyed Physics
#88715.blend

No Physics
T88715_b.blend

[particle problem submission.blend](https://archive.blender.org/developer/F10155107/particle_problem_submission.blend) **System Information** Operating system: not relevant Graphics card: not relevant **Blender Version** 3.0.0 **Short description of error** One is able to map the size of a particle based on it's lifetime using a texture, but sizes (as well as other attributes) are not affected if the particles are keyed with relations. To re-iterate, the steps below as described work with Newtonian physics, but not keyed. **Exact steps for others to reproduce the error** Create a mesh to act as an emitter Select your emitter and go to Properties > Particles, click New. In Properties > Particles > Render, click Object and choose the object that will be emitted as particles and its size. Duplicate the object and under Particles > Physics > Physics Type, select Keyed In Particles > Physics > Relations, create two relations and set the two objects you have in your scene as new particle targets Go to your 3D view and press alt A to launch a preview of your emission animation, then stop it somewhere in its course. In Properties > Particles > Textures, add New and give it a name. In Properties > Textures > Type, choose Blend. In Properties > Textures > Colors, click Ramp. In Properties > Textures > Mapping > Coordinate > choose Strand/Particles. In Properties > Textures > Influences, unclick Time and enable Size. In Properties > Textures > Colors, adjust the Ramp controller to increase or decrease the size of your emitted object over time. Keyed Physics [#88715.blend](https://archive.blender.org/developer/F10152583/T88715.blend) No Physics [T88715_b.blend](https://archive.blender.org/developer/F10152584/T88715_b.blend)

Don Lio commented

2021-06-01 06:14:36 +02:00

Added subscriber: @Dnatz

Philipp Oeser commented

2021-06-01 11:44:53 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-06-01 11:44:53 +02:00

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

Philipp Oeser commented

2021-06-01 11:44:53 +02:00

Can confirm.

This is certainly unexpected, but looks like this is just not implemented (so not sure if this could be considered a bug -- esp. since "old" particles are EOL).
It is only a couple of lines, will post a patch.

Can confirm. This is certainly unexpected, but looks like this is just not implemented (so not sure if this could be considered a bug -- esp. since "old" particles are EOL). It is only a couple of lines, will post a patch.

blender-admin commented

2021-06-01 11:57:30 +02:00

This issue was referenced by 5b6e0bad1b

This issue was referenced by 5b6e0bad1bbc33faba2247602349942ce163b7df

Jacques Lucke commented

2021-06-01 12:29:05 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-06-01 12:29:05 +02:00

@lichtwerk Can you share your example file to test this?

@Dnatz Next time it would be useful if you could share a simple example .blend file that shows the issue (this way one could save some time by not having to go through all the steps).

@lichtwerk Can you share your example file to test this? @Dnatz Next time it would be useful if you could share a simple example .blend file that shows the issue (this way one could save some time by not having to go through all the steps).

Philipp Oeser commented

2021-06-01 12:33:28 +02:00

In #88715#1168989, @JacquesLucke wrote:
@lichtwerk Can you share your example file to test this?

Sorry, forgot to add this to the report, added two files (one with keyed, one with no pysics)

> In #88715#1168989, @JacquesLucke wrote: > @lichtwerk Can you share your example file to test this? Sorry, forgot to add this to the report, added two files (one with keyed, one with no pysics)

Philipp Oeser commented

2021-06-01 17:59:42 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Philipp Oeser closed this issue

2021-06-01 17:59:42 +02:00

Philipp Oeser self-assigned this 2021-06-01 17:59:42 +02:00

Don Lio commented

2021-06-03 01:34:12 +02:00

In #88715#1168956, @lichtwerk wrote:
Can confirm.

This is certainly unexpected, but looks like this is just not implemented (so not sure if this could be considered a bug -- esp. since "old" particles are EOL).
It is only a couple of lines, will post a patch.

I added another file at the top that i think demonstrates what i mean nicely

> In #88715#1168956, @lichtwerk wrote: > Can confirm. > > This is certainly unexpected, but looks like this is just not implemented (so not sure if this could be considered a bug -- esp. since "old" particles are EOL). > It is only a couple of lines, will post a patch. I added another file at the top that i think demonstrates what i mean nicely

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Keyed particles aren't affected by size mapping through colour ramp. #88715