Follow Path for empty works only in negative values #89153

New Issue

Djole · 2021-06-14T20:25:19+02:00

Djole commented

2021-06-14 20:25:19 +02:00

System Information
Operating system: Linux-5.0.0-13-generic-x86_64-with-glibc2.29 64 Bits
Graphics card: AMD RAVEN (DRM 3.27.0, 5.0.0-13-generic, LLVM 8.0.0) X.Org 4.5 (Core Profile) Mesa 19.0.2

Blender Version
Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: 84da05a8b8
Worked: (newest version of Blender that worked as expected)

Short description of error
Hi, i can't play animation on 2.93.0 for linux using follow path offset kayframed from 0 to 100.

Exact steps for others to reproduce the error
It is originaly saved in blender (2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab ) but when i try to play it in new version 2.93.0 in viewport it does not work. So i found that Follow Path for empty on new version of blender 2.93.0 works only in negative values. And also can't work when value of offset is below -100, in old version works..

Example:
follow_path_bug1.blend

UPDATE:
It works when i make animation from 0

**System Information** Operating system: Linux-5.0.0-13-generic-x86_64-with-glibc2.29 64 Bits Graphics card: AMD RAVEN (DRM 3.27.0, 5.0.0-13-generic, LLVM 8.0.0) X.Org 4.5 (Core Profile) Mesa 19.0.2 **Blender Version** Broken: version: 2.93.0, branch: master, commit date: 2021-06-02 11:21, hash: `84da05a8b8` Worked: (newest version of Blender that worked as expected) **Short description of error** Hi, i can't play animation on 2.93.0 for linux using follow path offset kayframed from 0 to 100. **Exact steps for others to reproduce the error** It is originaly saved in blender (2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` ) but when i try to play it in new version 2.93.0 in viewport it does not work. So i found that Follow Path for empty on new version of blender 2.93.0 works only in negative values. And also can't work when value of offset is below -100, in old version works.. Example: [follow_path_bug1.blend](https://archive.blender.org/developer/F10171393/follow_path_bug1.blend) UPDATE: It works when i make animation from 0

Djole commented

2021-06-14 20:25:19 +02:00

Added subscriber: @djole

Philipp Oeser commented

2021-06-21 10:46:21 +02:00

Added subscriber: @lichtwerk

Philipp Oeser self-assigned this 2021-06-21 10:46:21 +02:00

Philipp Oeser commented

2021-06-21 10:46:21 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-06-21 10:46:21 +02:00

Can confirm, will check.

Philipp Oeser removed their assignment 2021-06-21 11:57:24 +02:00

Sebastian Parborg was assigned by Philipp Oeser

2021-06-21 11:57:24 +02:00

Philipp Oeser commented

2021-06-21 11:57:24 +02:00

Added subscriber: @ZedDB

Philipp Oeser commented

2021-06-21 11:57:24 +02:00

Behavior changed in 6a0906c09a

Quick workaround is to disable Clamp in the curve settings:

But that commit message says:

Previously, the "follow path constraint" ... were clamped. This restriction was lifted in cf2baa585c

In regards to bFollowPathConstraint->offset, this is not true, you could go however far you wanted (in both positive and negative "direction").
Note the offset gets subtracted, so you end up with negative ctime -- and this is totally normal, so clamping to zero is certainly wrong, possibly -1 to 1 is OK.
But really, the constraint was not clamped here (maybe do the clamping prior to the offset?)

@ZedDB: could you check?

Behavior changed in 6a0906c09a Quick workaround is to disable Clamp in the curve settings: ![image.png](https://archive.blender.org/developer/F10185841/image.png) But that commit message says: > Previously, the "follow path constraint" ... were clamped. This restriction was lifted in cf2baa585c In regards to `bFollowPathConstraint->offset`, this is not true, you could go however far you wanted (in both positive and negative "direction"). Note the offset gets subtracted, so you end up with negative ctime -- and this is totally normal, so clamping to zero is certainly wrong, possibly -1 to 1 is OK. But really, the constraint was not clamped here (maybe do the clamping prior to the offset?) @ZedDB: could you check?

blender-admin commented

2021-06-29 17:29:09 +02:00

This issue was referenced by 2659bc5457

This issue was referenced by 2659bc54577b4df7d1653938cf035b43a621aff9

blender-admin commented

2021-06-29 17:29:09 +02:00

This issue was referenced by be451354c9

This issue was referenced by be451354c9251d816b0e2950e334ae44931f6166

Sebastian Parborg commented

2021-06-30 11:22:12 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sebastian Parborg closed this issue