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Fix #113552: NLA Markers do not reset when length reaches 0.0 #110121

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Germano Cavalcante merged 2 commits from mano-wii/blender:fix_110108 into blender-v4.0-release 2023-10-16 16:46:56 +02:00
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Germano Cavalcante commented 2023-07-15 00:36:38 +02:00
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Caused by bd00324c26.

bd00324c26 allowed strip->start to have the same value as
strip->end (ignoring the NLASTRIP_MIN_LEN_THRESH).

So oLen can be 0.0f in BKE_nlameta_flush_transforms and create
nan when used in division.

This nan invalidates later transform operations.

I'm not sure if 0-length strips should be allowed. So maybe the fix should be extended to other places.

Caused by bd00324c26. bd00324c26 allowed `strip->start` to have the same value as `strip->end` (ignoring the `NLASTRIP_MIN_LEN_THRESH`). So `oLen` can be `0.0f` in `BKE_nlameta_flush_transforms` and create `nan` when used in division. This `nan` invalidates later transform operations. --- I'm not sure if 0-length strips should be allowed. So maybe the fix should be extended to other places.
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Germano Cavalcante requested review from Sybren A. Stüvel 2023-07-15 00:37:09 +02:00
Germano Cavalcante requested review from Brad Clark 2023-07-15 00:37:10 +02:00
Germano Cavalcante commented 2023-07-15 00:42:33 +02:00
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The change seems to have been made by Thibault de Villèle (thibaulltt) as we can see at https://archive.blender.org/developer/D14658, but he doesn't seem to be available anymore.

The change seems to have been made by Thibault de Villèle (thibaulltt) as we can see at https://archive.blender.org/developer/D14658, but he doesn't seem to be available anymore.
Nate Rupsis reviewed 2023-08-17 23:14:02 +02:00
source/blender/blenkernel/intern/nla.c Outdated
@ -1067,2 +1066,2 @@
p1 = (strip->start - oStart) / oLen;
p2 = (strip->end - oStart) / oLen;
if (oLen) {
/* compute positions of endpoints relative to old extents of strip */
Nate Rupsis commented 2023-08-17 23:14:02 +02:00
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Sentence should start with a capitol letter, and end with a period.

Sentence should start with a capitol letter, and end with a period.
Nate Rupsis commented 2023-08-17 23:14:42 +02:00
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Will need to update with main, nla.c -> nla.cc

Will need to update with `main`, nla.c -> nla.cc
Germano Cavalcante force-pushed fix_110108 from 9815d5b4c2 to 42b192c227 2023-08-18 15:09:10 +02:00 Compare
Germano Cavalcante commented 2023-08-18 15:12:21 +02:00
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Rebased on main.

While this fix fixes the transform bug (and possibly others), it is only a change for safeness.

Maybe it's good to check if it's really allowed to have a strip smaller than NLASTRIP_MIN_LEN_THRESH.

Rebased on main. While this fix fixes the transform bug (and possibly others), it is only a change for safeness. Maybe it's good to check if it's really allowed to have a strip smaller than `NLASTRIP_MIN_LEN_THRESH`.
Germano Cavalcante requested review from Nate Rupsis 2023-08-18 15:12:41 +02:00
Philipp Oeser commented 2023-08-18 15:44:03 +02:00
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It doesnt look like this fixes the underlying issue of #110108 (which seems to be burried in the design if I look at createTransNlaData -- here we always transform both the start and end of the strip, if we then apply snapping, this can end up obscurely snapping either start and end to the same spot or in the case of Snap to Seconds gets even more funny)

It doesnt look like this fixes the underlying issue of #110108 (which seems to be burried in the design if I look at `createTransNlaData` -- here we always transform both the start and end of the strip, if we then apply snapping, this can end up obscurely snapping either start and end to the same spot or in the case of Snap to Seconds gets even more funny)
Sybren A. Stüvel commented 2023-09-19 17:19:58 +02:00
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Thanks for the PR! Issue #110108 has been fixed by bd305c8d18, so I'll close this one.

Thanks for the PR! Issue #110108 has been fixed by bd305c8d18442ec056b84b889f604e0abeef8ea6, so I'll close this one.
Germano Cavalcante commented 2023-10-11 17:15:16 +02:00
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Unfortunately the problem has not been fixed.
If you scale a strip and this scale reaches zero at some point, the cancellation is not restored.

The regression in issue #110108 is due to the fact that the transformation is not reset due to generated Nan values.

bd305c8d18 changed the existing (and old) snap behavior, but I wouldn't say it fixed #110108, as the issue confirmed there was resetting transformation.

I am considering apply this cosmetic change, as it is not disruptive.

But I still believe that oLen should never be 0.0.

Unfortunately the problem has not been fixed. If you scale a strip and this scale reaches zero at some point, the cancellation is not restored. The regression in issue #110108 is due to the fact that the transformation is not reset due to generated Nan values. bd305c8d18 changed the existing (and old) snap behavior, but I wouldn't say it fixed #110108, as the issue confirmed there was resetting transformation. I am considering apply this cosmetic change, as it is not disruptive. But I still believe that `oLen` should never be `0.0`.
Germano Cavalcante reopened this pull request 2023-10-11 17:15:18 +02:00
Germano Cavalcante changed title from Fix #110108: NLA Markers transform not resetting correctly to Fix #113552: NLA Markers do not reset when length reaches 0.0 2023-10-11 17:32:48 +02:00
Sybren A. Stüvel requested review from Nathan Vegdahl 2023-10-12 10:44:35 +02:00
Sybren A. Stüvel refused to review 2023-10-12 10:44:38 +02:00
Sybren A. Stüvel commented 2023-10-12 10:45:15 +02:00
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I've added @nathanvegdahl as reviewer instead of me. He's been looking into the NLA's "no zero-length strips" thing recently, so his brain is more equipped than mine right now :)

I've added @nathanvegdahl as reviewer instead of me. He's been looking into the NLA's "no zero-length strips" thing recently, so his brain is more equipped than mine right now :)
Nathan Vegdahl commented 2023-10-12 12:28:09 +02:00
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Although this certainly addresses the immediate symptom and prevents the divide by zero, it's not clear to me that this is the right fix. Specifically, the length of strips is never supposed to be zero in the first place.

Having said that, as discussed in #107030 (comment), the issues around actually ensuring non-zero strip length are a bit deep and tangled. So I think the fix in this PR is reasonable as a stop-gap, because it does address the symptom described in the bug report.

But before accepting, I think a comment needs to be added to the code explaining that this is a (possibly) stop-gap fix, and that the source of the zero-length strip needs to be tracked down for a proper fix. The comment should probably use the WORKAROUND tag.

Although this certainly addresses the immediate symptom and prevents the divide by zero, it's not clear to me that this is the right fix. Specifically, the length of strips is never supposed to be zero in the first place. Having said that, as discussed in https://projects.blender.org/blender/blender/issues/107030#issuecomment-1030437, the issues around actually ensuring non-zero strip length are a bit deep and tangled. So I think the fix in this PR is reasonable as a stop-gap, because it does address the symptom described in the bug report. But before accepting, I think a comment needs to be added to the code explaining that this is a (possibly) stop-gap fix, and that the source of the zero-length strip needs to be tracked down for a proper fix. The comment should probably use the [`WORKAROUND`](https://wiki.blender.org/wiki/Style_Guide/C_Cpp#Comments) tag.
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Germano Cavalcante force-pushed fix_110108 from 42b192c227 to 5d985cba2a 2023-10-13 21:30:46 +02:00 Compare
Germano Cavalcante commented 2023-10-13 21:32:23 +02:00
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The patch was getting old, so I decided to rebase onto main and force push. (although the fix should go to blender-v4.0-release).

  • Improved comments
The patch was getting old, so I decided to rebase onto main and force push. (although the fix should go to `blender-v4.0-release`). - Improved comments
Nathan Vegdahl commented 2023-10-16 10:51:59 +02:00
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Thanks @mano-wii !

I don't know if we need to (or should) mention specific functions in the comment in this case. To me, at least, it's not clear where the zero strip lengths are coming from here (e.g. it could be in the transform code). So I think this may be a better comment:

/* WORKAROUND: in theory, a strip should never be zero length. However,
 * zero-length strips are nevertheless showing up here (see issue #113552).
 * This is a stop-gap fix to handle that and prevent a divide by zero. A
 * proper fix will need to track down and fix the source(s) of these
 * zero-length strips. */

Sorry for the run-around! Just this one last change and then we can get it merged. :-)

(Edit: changed comment to reference the issue.)

Thanks @mano-wii ! I don't know if we need to (or should) mention specific functions in the comment in this case. To me, at least, it's not clear where the zero strip lengths are coming from here (e.g. it could be in the transform code). So I think this may be a better comment: ```c /* WORKAROUND: in theory, a strip should never be zero length. However, * zero-length strips are nevertheless showing up here (see issue #113552). * This is a stop-gap fix to handle that and prevent a divide by zero. A * proper fix will need to track down and fix the source(s) of these * zero-length strips. */ ``` Sorry for the run-around! Just this one last change and then we can get it merged. :-) (Edit: changed comment to reference the issue.)
Nathan Vegdahl commented 2023-10-16 10:56:54 +02:00
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so I decided to rebase onto main

Oh! Also, please rebase onto and change the PR to merge to blender-v4.0-release, because we'll merge there first.

> so I decided to rebase onto main Oh! Also, please rebase onto and change the PR to merge to `blender-v4.0-release`, because we'll merge there first.
Germano Cavalcante changed title from Fix #113552: NLA Markers do not reset when length reaches 0.0 to Fix #113552: NLA Markers do not reset when length reaches 0.0 2023-10-16 14:52:02 +02:00
mano-wii changed target branch from main to blender-v4.0-release 2023-10-16 14:52:05 +02:00
Germano Cavalcante force-pushed fix_110108 from 4773eaa7de to 79cc6ba238 2023-10-16 15:05:40 +02:00 Compare
Nathan Vegdahl approved these changes 2023-10-16 16:37:10 +02:00
Nathan Vegdahl left a comment
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Looks good to me!

Looks good to me!
Germano Cavalcante merged commit 88a6df24aa into blender-v4.0-release 2023-10-16 16:46:56 +02:00
Germano Cavalcante deleted branch fix_110108 2023-10-16 16:47:01 +02:00
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