Can't set negative Frame start #42151

New Issue

Kasper Jansen · 2014-10-08T18:20:52+02:00

Kasper Jansen commented

2014-10-08 18:20:52 +02:00

System Information
Linux 64 bit (mac, win)
Nvidia

Blender Version
Broken: 2.72
Worked: not sure

Short description of error
Wanted to set start frame to a negative number to view particles starting at frame -300. Allow Negative Frames is turned on. Can't set start frame below 0.

Exact steps for others to reproduce the error

Start Blender
Enable Allow Negative Frames i User Prefs
Set start frame to -100
Start frame can't go under 0

**System Information** Linux 64 bit (mac, win) Nvidia **Blender Version** Broken: 2.72 Worked: not sure **Short description of error** Wanted to set start frame to a negative number to view particles starting at frame -300. Allow Negative Frames is turned on. Can't set start frame below 0. **Exact steps for others to reproduce the error** 1. Start Blender 2. Enable Allow Negative Frames i User Prefs 3. Set start frame to -100 4. Start frame can't go under 0

Kasper Jansen commented

2014-10-08 18:20:52 +02:00

Changed status to: 'Open'

Kasper Jansen commented

2014-10-08 18:20:52 +02:00

Added subscriber: @janz

Bastien Montagne commented

2014-10-08 19:05:07 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2014-10-08 19:05:07 +02:00

Bastien Montagne self-assigned this 2014-10-08 19:05:07 +02:00

Bastien Montagne commented

2014-10-08 19:05:07 +02:00

Thanks for the report, but no bug here, things work as intended in code (looks like some output format do not support negative start time…).

Kasper Jansen commented

2014-10-09 16:09:17 +02:00

It may not be a bug, but i'm wondering what the point of "allow negative frames" is when you can't render them? I have a setup with paticles that start at frame -300 and and my shot starts at frame 1. All is well until i need to render the preroll from -300 to 0. I know that i could move all my animation in the scene and start my particles at frame 1 instead but this could be a very time consuming process (can you move a particle cache?). I understand that some output formats doesn't support negative frames but with frame sequences this is just a character in the frame numbers(I know that it probably goes deeper than than in the code). It may not be readable in blender or other packages but i usually just rename/renumber in external software as needed. I hope this all makes sense in some way. In any case it would be nice to hear if you have any suggestions as to how i would go about rendering the particles before frame 0.

Vaclav Benc commented

2015-11-17 11:07:57 +01:00

Added subscriber: @VaclavBenc

Vaclav Benc commented

2015-11-17 11:07:57 +01:00

It would be very helpful if at least the simulation did actually work in the negative time - you usually do not want to render the negative time anyway, but you just want things to get going in the simulation, and then render it from frame 0.

Still, this is quite a bad limitation :(

Please address this issue

Tried with 2.76

It would be very helpful if at least the simulation did actually work in the negative time - you usually do not want to render the negative time anyway, but you just want things to get going in the simulation, and then render it from frame 0. Still, this is quite a bad limitation :( Please address this issue Tried with 2.76

gerry Tucker commented

2019-12-07 05:39:55 +01:00

Added subscriber: @GT

gerry Tucker commented

2019-12-07 05:39:55 +01:00

I'm running into this same issue in 2.81. I encountered it because for some unknown reason my clip loaded intro the video editor on negative frames. because of this feature I'm unable to track my footage

Beyond my specific problem, I agree with Vaclav Benc. it would be very helpful to have access to the negative frames for simulation.

I'm running into this same issue in 2.81. I encountered it because for some unknown reason my clip loaded intro the video editor on negative frames. because of this feature I'm unable to track my footage Beyond my specific problem, I agree with Vaclav Benc. it would be very helpful to have access to the negative frames for simulation.

Luis Burdallo commented

2020-02-10 15:28:43 +01:00

Added subscriber: @Luis.Burdallo

Luis Burdallo commented

2020-02-10 15:28:43 +01:00

It would be great to hear what the use of "Allow Negative Frames" is when you can't actually set anything below 0. I needed this atm and it seems there is no work around? 2.82 still not working. Why is it limited at 0 where the timeline clearly shows a negative range?

Gad commented

2020-04-06 14:04:47 +02:00

Added subscriber: @Gadas

Gad commented

2020-04-06 14:04:47 +02:00

This comment was removed by @Gadas

*This comment was removed by @Gadas*

Felix Kütt commented

2020-08-31 10:02:32 +02:00

Added subscriber: @FelixKutt

Felix Kütt commented

2020-08-31 10:02:32 +02:00

Still an issue in 2020. Makes working with mocap data rather annoying. But hey it's blender. Having to work around issues is what life is like here.

Philipp Oeser commented

2020-10-05 15:12:47 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-10-05 15:12:47 +02:00

You can set a negative preview range (using the clock icon), just not for rendering.

You can set a negative **preview** range (using the clock icon), just not for **rendering**. ![image.png](https://archive.blender.org/developer/F8957916/image.png)

Felix Kütt commented

2020-10-05 22:38:59 +02:00

And can you actually go to those negative frames to preview and edit keyframes in that range? I can't. Edit them in graph sure, but not preview.

I'm talking about the playhead, though just noticed that pressing the button to jump to first frame does go to the negative frame. But that is no way to work.

And can you actually go to those negative frames to preview and edit keyframes in that range? I can't. Edit them in graph sure, but not preview. I'm talking about the playhead, though just noticed that pressing the button to jump to first frame does go to the negative frame. But that is no way to work.

Philipp Oeser commented

2020-10-06 19:04:14 +02:00

Does Allow Negative Frames not work for you?

I can go to negative keyframes and edit them.

Does `Allow Negative Frames` not work for you? ![image.png](https://archive.blender.org/developer/F8961733/image.png) I can go to negative keyframes and edit them.

Felix Kütt commented

2020-10-06 21:20:23 +02:00

It does, but I could have sworn I had searched for it from there previously and it wasn't there. Must have managed to look right past it. Why is it not on by default though?

tsuru commented

2021-01-11 06:01:25 +01:00

Added subscriber: @turuturu

tsuru commented

2021-01-11 06:01:25 +01:00

It' very helpful for me too, thank you very much. I solved the same problem.

tsuru commented

2021-01-11 07:47:50 +01:00

Oh, for rendering it didn't work, I see. Still, I'm in trouble. Maybe I have to move timing of physical simulation...

Zafar Iqbal commented

2021-01-19 07:24:32 +01:00

Added subscriber: @r4ptor-3

Zafar Iqbal commented

2021-01-19 07:24:32 +01:00

Using negative frames for stuff like pre-calculating sims is a very common thing especially among studios. It makes the pipeline run smoother vs. having animation frames with arbitrary starting numbers (which easily could change later on) messing it up for the comp guys who in turn would wish you died xD

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Can't set negative Frame start #42151