force field "radial distance" has no effect #43654

New Issue

Ronny G · 2015-02-13T15:31:40+01:00

Ronny G commented

2015-02-13 15:31:40 +01:00

System Information
ubuntu 14.04, 630GT

Blender Version
Broken: 2.73

Short description of error

tube or cone radial -> use_maximum has no effect

setup

alt+a

the wind effect should be limited to the tube

Exact steps for others to reproduce the error

blend

tuberadialfield.blend

download the blend and hit alt+a

**System Information** ubuntu 14.04, 630GT **Blender Version** Broken: 2.73 **Short description of error** tube or cone radial -> use_maximum has no effect setup ![Screenshot_from_2015-02-13_14:05:23.png](https://archive.blender.org/developer/F143177/Screenshot_from_2015-02-13_14_05_23.png) alt+a ![Screenshot_from_2015-02-13_14:07:40.png](https://archive.blender.org/developer/F143178/Screenshot_from_2015-02-13_14_07_40.png) the wind effect should be limited to the tube **Exact steps for others to reproduce the error** blend [tuberadialfield.blend](https://archive.blender.org/developer/F143181/tuberadialfield.blend) download the blend and hit alt+a

Ronny G commented

2015-02-13 15:31:40 +01:00

Changed status to: 'Open'

Ronny G commented

2015-02-13 15:31:40 +01:00

Added subscriber: @nudelZ

Bastien Montagne commented

2015-02-13 17:13:04 +01:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2015-02-13 17:13:04 +01:00

Bastien Montagne self-assigned this 2015-02-13 17:13:04 +01:00

Bastien Montagne commented

2015-02-13 17:13:04 +01:00

Maximum distance works perfectly, as you can see by putting your force field away enough from your particles, it won't affect them at all.

But once your particles have gained energy from a force, they won't loose it at all in Blender's ideal world, so they will just keep going on forever. Unless you add them some damping, of course… ;)

Anyway, thanks for the report, but no bug at all here.

Maximum distance works perfectly, as you can see by putting your force field away enough from your particles, it won't affect them at all. But once your particles have gained energy from a force, they won't loose it at all in Blender's ideal world, so they will just keep going on forever. Unless you add them some damping, of course… ;) Anyway, thanks for the report, but no bug at all here.

Ronny G commented

2015-02-13 17:39:52 +01:00

it doesnt work here mont29

there is no force except the field and the force should be limited to the tube?

can you show me a screenshot or video?

edit:

with shape set to "point" it works but not with "plane"!

it doesnt work here mont29 there is no force except the field and the force should be limited to the tube? can you show me a screenshot or video? edit: with shape set to "point" it works but not with "plane"!

ronan ducluzeau commented

2015-02-13 17:41:23 +01:00

Added subscriber: @zeauro

ronan ducluzeau commented

2015-02-13 17:41:23 +01:00

Nutel is probably talking about radial or angular maximum distance for Tube or Cone, not maximum distance for z axis.

I think that is a known limitation.
This kind of fall-off shape only works for Point force field and not for Plane Force Field.

Nutel is probably talking about radial or angular maximum distance for Tube or Cone, not maximum distance for z axis. I think that is a known limitation. This kind of fall-off shape only works for Point force field and not for Plane Force Field.

Gottfried Hofmann commented

2015-02-13 19:19:48 +01:00

Added subscriber: @GottfriedHofmann

Gottfried Hofmann commented

2015-02-13 19:19:48 +01:00

mont29, I can confirm the issue. Only the +/- Z maximum is working, not the radial maximum in the tube falloff.

Note: This bug was already raised years ago at Blender conference during my smoke simulation masterclass.

mont29, I can confirm the issue. Only the +/- Z maximum is working, not the radial maximum in the tube falloff. Note: This bug was already raised years ago at Blender conference during my smoke simulation masterclass.

Bastien Montagne commented

2015-02-13 21:29:42 +01:00

Changed status from 'Archived' to: 'Open'

Bastien Montagne reopened this issue

2015-02-13 21:29:42 +01:00

Bastien Montagne removed their assignment 2015-02-13 21:31:28 +01:00

Lukas Tönne was assigned by Bastien Montagne

2015-02-13 21:31:28 +01:00

Bastien Montagne commented

2015-02-13 21:31:28 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2015-02-13 21:31:28 +01:00

Ok, my bad, closed that one too quickly.

Still, from a quick look to the code, I think there is no bug here, 'plane' shape simply cannot work with radial imho. Do not know that code well, though, so assigning to Lukas to get authorized opinion here. :)

Ok, my bad, closed that one too quickly. Still, from a quick look to the code, I think there is no bug here, 'plane' shape simply cannot work with radial imho. Do not know that code well, though, so assigning to Lukas to get authorized opinion here. :)

Lukas Tönne commented

2015-08-20 10:18:50 +02:00

Effectors are a mystery.

They have 2 different vectors to determine "distance":

from the center to the particle
from the center plane, orthogonal to the direction, to the particle

The radial distance should be determined by subtracting the normal component of the 1st vector - but the code actually uses the 2nd version instead, which has no radial component in the first place ...

I could try to fix this, but at the expense of breaking every existing setup (as usual...). sigh

Effectors are a mystery. They have 2 different vectors to determine "distance": 1) from the center to the particle 2) from the center plane, orthogonal to the direction, to the particle The *radial distance* should be determined by subtracting the normal component of the 1st vector - but the code actually uses the 2nd version instead, which has no radial component in the first place ... I could try to fix this, but at the expense of breaking every existing setup (as usual...). *sigh*

Gottfried Hofmann commented

2015-08-20 11:15:32 +02:00

Don't bother breaking things - there was another user at a Blender conference (I guess it was 2011) who also wanted this fixed.

blender-admin commented

2015-08-20 11:58:11 +02:00

This issue was referenced by f4d8ce9781

This issue was referenced by f4d8ce97810476d0f0bf27809ab411081f0042f8

Lukas Tönne commented

2015-08-20 11:58:30 +02:00

Changed status from 'Open' to: 'Resolved'

Lukas Tönne closed this issue

2015-08-20 11:58:30 +02:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

force field "radial distance" has no effect #43654