Soft body cache not being cleared when it should be in Blender 2.8 #60451

New Issue

Jordan · 2019-01-12T22:34:21+01:00

Jordan commented

2019-01-12 22:34:21 +01:00

Operating system: Windows 10 Home, 64-bit
Graphics card: Nvidia GTX 1070

Broken:
2.80, ce3475f747, blender2.8, 2019-1-11

Worked: Seems to work in 2.79b

Soft body cache not being fully cleared / overwritten when it should be (e.g., when the animation player loops while a soft body object is being manipulated in the viewport, or when adjustments are made to keyframes of objects that influence the soft body simulation). Cache has to be cleared manually by entering & exiting Edit Mode on soft body object.

Create a cube and enable soft body physics on it.
Create an armature with a single bone, and parent the cube from step 1 to the bone.
Enter pose mode, hit play on the timeline, and manipulate the bone. The attached soft body should behave as expected during the first loop through the timeline, but will behave erratically on subsequent loops.
Stop the animation, clear the soft body cache (by entering & exiting Edit Mode with soft body object selected), and set some rotation keyframes on the bone the soft body is parented to. Hit play on the timeline to fill the cache, then stop the animation and change some of the keyframes. When the animation is played again, results will be similar to those from step 3: i.e., erratic behavior of the soft body due to the cache not being cleared.

bug_report.blend

Operating system: Windows 10 Home, 64-bit Graphics card: Nvidia GTX 1070 Broken: 2.80, ce3475f74794, blender2.8, 2019-1-11 Worked: Seems to work in 2.79b Soft body cache not being fully cleared / overwritten when it should be (e.g., when the animation player loops while a soft body object is being manipulated in the viewport, or when adjustments are made to keyframes of objects that influence the soft body simulation). Cache has to be cleared manually by entering & exiting Edit Mode on soft body object. 1. Create a cube and enable soft body physics on it. 2. Create an armature with a single bone, and parent the cube from step 1 to the bone. 3. Enter pose mode, hit play on the timeline, and manipulate the bone. The attached soft body should behave as expected during the first loop through the timeline, but will behave erratically on subsequent loops. 4. Stop the animation, clear the soft body cache (by entering & exiting Edit Mode with soft body object selected), and set some rotation keyframes on the bone the soft body is parented to. Hit play on the timeline to fill the cache, then stop the animation and change some of the keyframes. When the animation is played again, results will be similar to those from step 3: i.e., erratic behavior of the soft body due to the cache not being cleared. [bug_report.blend](https://archive.blender.org/developer/F6269135/bug_report.blend)

Jordan commented

2019-01-12 22:34:21 +01:00

Added subscriber: @Hookflash

Bastien Montagne was assigned by Sebastian Parborg

2019-01-28 12:19:00 +01:00

Bastien Montagne removed their assignment 2019-01-31 11:19:22 +01:00

Sergey Sharybin was assigned by Bastien Montagne

2019-01-31 11:19:22 +01:00

Bastien Montagne commented

2019-01-31 11:19:22 +01:00

Added subscribers: @Sergey, @mont29

Bastien Montagne commented

2019-01-31 11:19:22 +01:00

This is depsgraph building issue I think, we probably need to add calls to something like DEG_add_object_pointcache_relation() for all objects which affect the softbody one (like it is done for forcefields and collision ones already). Will let that to @Sergey though, am not so sure where/how to do that properly.

This is depsgraph building issue I think, we probably need to add calls to something like `DEG_add_object_pointcache_relation()` for all objects which affect the softbody one (like it is done for forcefields and collision ones already). Will let that to @Sergey though, am not so sure where/how to do that properly.

Bastien Montagne commented

2019-01-31 19:45:01 +01:00

Fwiw, tried to apply same fix as 9d10fc13e7 to softbody, does not fix that issue. Also, files from #61046 exhibit same problem as in this report, so this is something generic to all pointcached simulations.

Fwiw, tried to apply same fix as 9d10fc13e7 to softbody, does not fix that issue. Also, files from #61046 exhibit same problem as in this report, so this is something generic to all pointcached simulations.

blender-admin commented

2019-02-01 14:05:00 +01:00

This issue was referenced by 227ed1aa35

This issue was referenced by 227ed1aa3516ae1504f49be90085b2fdc703f6a1

Sergey Sharybin commented

2019-02-01 15:44:12 +01:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2019-02-01 15:44:12 +01:00

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Soft body cache not being cleared when it should be in Blender 2.8 #60451