Paricles show in multiple (incorrect) locations when rendered #28116

New Issue

Jeff H · 2011-07-29T15:08:15+02:00

Jeff H commented

2011-07-29 15:08:15 +02:00

%%%I refer to these out of place particles as ghost or phantom particles for lack of a shorter, more accurate name.

Open the blend file and go to frame 5
press F12 to render
you should see the ghost particles similar to the what you see in the video linked below
if not, go another 5 frames and render
repeat until you see the ghost particles in the render

If you still cannot see the issue, here is a video that shows it:
http://www.youtube.com/watch?v=WQ8T4SB5ElU

have consistently reproduced the issue on 5 different computers, with different versions of blender, on both Windows and Mac

It may also be worth reading though my thread on blenderartist.org. There is a link to an old blend file that should show the same issue, though the one i uploaded here produced the issue more constantly:
http://blenderartists.org/forum/showthread.php?207676-phantom-particles%%%

%%%I refer to these out of place particles as ghost or phantom particles for lack of a shorter, more accurate name. Open the blend file and go to frame 5 press F12 to render you should see the ghost particles similar to the what you see in the video linked below if not, go another 5 frames and render repeat until you see the ghost particles in the render If you still cannot see the issue, here is a video that shows it: http://www.youtube.com/watch?v=WQ8T4SB5ElU have consistently reproduced the issue on 5 different computers, with different versions of blender, on both Windows and Mac It may also be worth reading though my thread on blenderartist.org. There is a link to an old blend file that should show the same issue, though the one i uploaded here produced the issue more constantly: http://blenderartists.org/forum/showthread.php?207676-phantom-particles%%%

Jeff H commented

2011-07-29 15:08:15 +02:00

Changed status to: 'Open'

Mike Pan commented

2011-08-15 21:15:06 +02:00

%%%I've noticed that behavior too in some of my work. The temporary solution is to select the particle emitter object, go to the particle property setting, and click on Bake. This will precalculate all the particles, which seems to solve the phantom particles bug.

But it does seems like a bug to me.%%%

%%%I've noticed that behavior too in some of my work. The temporary solution is to select the particle emitter object, go to the particle property setting, and click on Bake. This will precalculate all the particles, which seems to solve the phantom particles bug. But it does seems like a bug to me.%%%

Jeff H commented

2011-08-15 22:39:49 +02:00

%%%Thanks Mike. I was aware of this workaround (actually i think it was you who told me before). But if you try this workaround on the provided blend file, you can see another bug that i have come across many times in the past on earlier versions of blender as well as 2.59.
After baking, play the animation and you can see some random particles that seem to be rushing towards the emitting mesh in rhythmic waves.
here is a video that shows it:
http://www.youtube.com/watch?v=Msua2mxjnro

i dont know if this is related to this bug report. I can fill out another report if you want. However, this bug does seem to be related to cache steps. when set to "1" before you bake you dont see the bug. %%%

%%%Thanks Mike. I was aware of this workaround (actually i think it was you who told me before). But if you try this workaround on the provided blend file, you can see another bug that i have come across many times in the past on earlier versions of blender as well as 2.59. After baking, play the animation and you can see some random particles that seem to be rushing towards the emitting mesh in rhythmic waves. here is a video that shows it: http://www.youtube.com/watch?v=Msua2mxjnro i dont know if this is related to this bug report. I can fill out another report if you want. However, this bug does seem to be related to cache steps. when set to "1" before you bake you dont see the bug. %%%

Miika Hamalainen commented

2011-09-12 18:38:45 +02:00

%%%Both issues seem to be related to the 3D view display percentage setting. Regarding the original report, I suppose you missed the "Display percentage makes dynamics inaccurate without baking!" message in particle settings? :)

But agreed, this is clearly an issue and should be fixed.%%%

%%%Both issues seem to be related to the 3D view display percentage setting. Regarding the original report, I suppose you missed the "Display percentage makes dynamics inaccurate without baking!" message in particle settings? :) But agreed, this is clearly an issue and should be fixed.%%%

Ton Roosendaal commented

2012-10-21 17:38:18 +02:00

%%%Yeah... but we suffer lack of maintenance here. In many ways we should consider the current particle as "as is" and move our hopes to the new system from Lukas. :)

Since a workaround exists, I marked this error on our wiki todo list for future reference.
http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles%%%

%%%Yeah... but we suffer lack of maintenance here. In many ways we should consider the current particle as "as is" and move our hopes to the new system from Lukas. :) Since a workaround exists, I marked this error on our wiki todo list for future reference. http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Particles%%%

Ton Roosendaal commented

2012-10-21 17:38:18 +02:00

Changed status from 'Open' to: 'Archived'

Ton Roosendaal closed this issue

2012-10-21 17:38:18 +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

Paricles show in multiple (incorrect) locations when rendered #28116