Indication of Particles is different when I change 'Emit From'. #44866

New Issue

perfection cat · 2015-05-28T06:16:29+02:00

perfection cat commented

2015-05-28 06:16:29 +02:00

System Information
Windows XP/SP3 32bits

Blender Version
Broken: version 2.74 (sub 5), branch b'master', commit date b'2015-05-27' b'23:07', hash b'46d8bcb', b'Release'
Worked: (optional)

Short description of error
Indication of Particles is different when I change 'Emit From'.
Exact steps for others to reproduce the error
A state when I set Particles system.
But I set a value same as Start Frame in End Frame to display Particles.

I set Faces again after I changed 'Emit From' elsewhere.

Indication of Particles is different from the last time.

However, the indication does not change when I set Normal of 'Emitter Geometry' to 0 and perform the same thing.
A change for 1 frame of Normal seems to be added.

**System Information** Windows XP/SP3 32bits **Blender Version** Broken: version 2.74 (sub 5), branch b'master', commit date b'2015-05-27' b'23:07', hash b'46d8bcb', b'Release' Worked: (optional) **Short description of error** Indication of Particles is different when I change 'Emit From'. **Exact steps for others to reproduce the error** A state when I set Particles system. But I set a value same as Start Frame in End Frame to display Particles. ![Png1.png](https://archive.blender.org/developer/F180555/Png1.png) I set Faces again after I changed 'Emit From' elsewhere. ![Png2.png](https://archive.blender.org/developer/F180557/Png2.png) Indication of Particles is different from the last time. However, the indication does not change when I set Normal of 'Emitter Geometry' to 0 and perform the same thing. A change for 1 frame of Normal seems to be added.

perfection cat commented

2015-05-28 06:16:29 +02:00

Changed status to: 'Open'

perfection cat commented

2015-05-28 06:16:29 +02:00

Added subscriber: @sindra1961

perfection cat commented

2015-05-28 06:35:18 +02:00

This phenomenon is unrelated to end frame being the same as start frame.
It only sets it to merely increase displayed particle.

When start/end frame is different.

A state when I set Particles system.

I set Faces again after I changed 'Emit From' elsewhere.

This phenomenon is unrelated to end frame being the same as start frame. It only sets it to merely increase displayed particle. When start/end frame is different. A state when I set Particles system. ![Png3.png](https://archive.blender.org/developer/F180572/Png3.png) I set Faces again after I changed 'Emit From' elsewhere. ![Png4.png](https://archive.blender.org/developer/F180574/Png4.png)

perfection cat commented

2015-05-28 06:39:09 +02:00

When blender reads blend file, a change for 1 frame of Normal is added.
This is a secondary bug, too.

When blender reads blend file, a change for 1 frame of Normal is added. This is a secondary bug, too.

Lukas Tönne was assigned by Aaron Carlisle

2015-05-28 15:30:52 +02:00

Aaron Carlisle commented

2015-05-28 15:30:52 +02:00

Added subscriber: @Blendify

perfection cat commented

2015-05-30 05:59:31 +02:00

This is the contents which I reported in #43818 .
Because plural malfunction was included in that report, I mediated a report.

This is the contents which I reported in [#43818 ](https://developer.blender.org/T43818). Because plural malfunction was included in that report, I mediated a report.

Sergey Sharybin commented

2015-06-02 08:30:35 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2015-06-02 08:30:35 +02:00

First of all, steps of reproducing the issue are not totally clear to me. Please attach simple .blend and instructions about what exact to change in what order, what you expect to see after those steps and what you get instead.

P.S. Old particles are quite fragile and needs major redesign. Unless this is a regression it's likely belongs to a TODO list. But that i'll let @LukasTonne to decide.

First of all, steps of reproducing the issue are not totally clear to me. Please attach simple .blend and instructions about what exact to change in what order, what you expect to see after those steps and what you get instead. P.S. Old particles are quite fragile and needs major redesign. Unless this is a regression it's likely belongs to a TODO list. But that i'll let @LukasTonne to decide.

perfection cat commented

2015-06-02 10:24:02 +02:00

I should have already shown the reason that could not attach blend file.
This is because results are different when blender read blend file.

Then I attach the file of the sample.
sample.blend
I show a procedure to confirm.

Open the attached file.

Add particles system to Cube.

You should be able to confirm that there is particle in the place that I surrounded.
Change 'Emit From' to the Volume.

Change 'Emit From' to Faces.

There is particle in the places different first.
When Normal of Emitter Geometry is 0, this does not occur.

I think that the position where it was displayed first is right.
When I save it in a file and read it, it is set at the wrong position.

I should have already shown the reason that could not attach blend file. This is because results are different when blender read blend file. Then I attach the file of the sample. [sample.blend](https://archive.blender.org/developer/F183333/sample.blend) I show a procedure to confirm. Open the attached file. ![sample1.png](https://archive.blender.org/developer/F183334/sample1.png) Add particles system to Cube. ![sample2.png](https://archive.blender.org/developer/F183336/sample2.png) You should be able to confirm that there is particle in the place that I surrounded. Change 'Emit From' to the Volume. ![sample3.png](https://archive.blender.org/developer/F183338/sample3.png) Change 'Emit From' to Faces. ![sample4.png](https://archive.blender.org/developer/F183340/sample4.png) There is particle in the places different first. When Normal of Emitter Geometry is 0, this does not occur. I think that the position where it was displayed first is right. When I save it in a file and read it, it is set at the wrong position.

perfection cat commented

2015-06-03 03:23:23 +02:00

There are some bugs in current particle system.
Because they are related to this problem, at first I explain those problems.
blend file
ParticleSystem.blend

Open an attached file.

Some setting is changed in particle system set in this Cube.

Number/End Frame of the Emission section.
Emitter Object(X) of the Velocity section.
'How particles are rendered' of the Render section.
When 'Emit From' is changed right after you opened the file, the indication changes in a chosen form.
Choose 'Emit From' in order shown below.
order : Faces > Verts > Volume

Push short cut (SHIFT+CTRL+DOWN ARROW).

When you move a frame first, particles is not displayed now based on chosen 'Emit From'.
particles is displayed based on it which was chosen right before 'Emit From' is chosen.
It seemed to set Verts in 'Emit From'.
When you choose 'Emit From' by the following confirmation work to evade this bug, choose the same thing twice.

I explain this report below.
Open an attached file.

Choose Verts of 'Emit From' twice.

Cone which turned a little is displayed.
Push short cut (SHIFT+CTRL+DOWN ARROW).

This is the right indication of the first frame.
If you choose Verts of 'Emit From' twice again, it is displayed as before.
I think that a position of particle slipped off because the value of the Velocity section was considered to be the first frame.
I do not understand the reason why Cone turns.
The position where Cone is displayed when you chose Verts of 'Emit From' twice is the same as a position of Cone when you moved it to the next frame after you return frame first.

I commented that this problem occurs when blender loaded blend file before, but correct it because it was my mistake.

There are some bugs in current particle system. Because they are related to this problem, at first I explain those problems. blend file [ParticleSystem.blend](https://archive.blender.org/developer/F183640/ParticleSystem.blend) Open an attached file. ![PS1.png](https://archive.blender.org/developer/F183642/PS1.png) Some setting is changed in particle system set in this Cube. - Number/End Frame of the Emission section. - Emitter Object(X) of the Velocity section. - 'How particles are rendered' of the Render section. When 'Emit From' is changed right after you opened the file, the indication changes in a chosen form. Choose 'Emit From' in order shown below. order : Faces > Verts > Volume ![PS2.png](https://archive.blender.org/developer/F183652/PS2.png) Push short cut (SHIFT+CTRL+DOWN ARROW). ![PS3.png](https://archive.blender.org/developer/F183655/PS3.png) When you move a frame first, particles is not displayed now based on chosen 'Emit From'. particles is displayed based on it which was chosen right before 'Emit From' is chosen. It seemed to set Verts in 'Emit From'. When you choose 'Emit From' by the following confirmation work to evade this bug, choose the same thing twice. I explain this report below. Open an attached file. ![PS1.png](https://archive.blender.org/developer/F183642/PS1.png) Choose Verts of 'Emit From' twice. ![PS4.png](https://archive.blender.org/developer/F183677/PS4.png) Cone which turned a little is displayed. Push short cut (SHIFT+CTRL+DOWN ARROW). ![PS5.png](https://archive.blender.org/developer/F183679/PS5.png) This is the right indication of the first frame. If you choose Verts of 'Emit From' twice again, it is displayed as before. I think that a position of particle slipped off because the value of the Velocity section was considered to be the first frame. I do not understand the reason why Cone turns. The position where Cone is displayed when you chose Verts of 'Emit From' twice is the same as a position of Cone when you moved it to the next frame after you return frame first. ![PS6.png](https://archive.blender.org/developer/F183696/PS6.png) I commented that this problem occurs when blender loaded blend file before, but correct it because it was my mistake.

Bastien Montagne commented

2015-06-19 09:53:36 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2015-06-19 09:53:36 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2015-06-19 09:53:36 +02:00

Bastien Montagne commented

2015-06-19 09:53:36 +02:00

Thanks for the report, but will archive that for now. As Sergey said, particles are currently considered more or less unfixable…

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Indication of Particles is different when I change 'Emit From'. #44866