RNA_path_from_ID_to_property fails for pointcaches [thus ALT+click does as well...] #64573

New Issue

John L. Gordon · 2019-05-14T00:20:13+02:00

John L. Gordon commented

2019-05-14 00:20:13 +02:00

I am a blender novice but cannot find out about this problem.
I am sorry if the problem is simply my lack of understanding and hope it does not take too much of your time to verify this issue.

System Information
Operating system: Windows 10 Pro 64-bit
Graphics card: 4095MB NVIDIA GeForce GTX 1080 (NVIDIA)

Blender Version
blender-2.80.0-git.0264d8390fa2-windows64 ( + all previous blender 2.8 tested to date)

Short description of error
A plane has cloth physics enabled.
end time in the (cloth physics) cache is changed to say 1000
Several duplicates of this are made.
Duplicates resort to 250 end time.
Cannot copy end time to selected duplicates either.
Only way to change end time for all duplicates is to do it one at a time manually.

Exact steps for others to reproduce the error
create a plane which is pinned at top so that it drops in the z direction
add physics cloth to this plane.
(I also enabled object (not self) collision but I don't think this is important).
Change the cache end time for the cloth to 1000
Duplicate the cloth (plane) several times
Then try to make the duplicates have a 1000 end time in the cache.

I am a blender novice but cannot find out about this problem. I am sorry if the problem is simply my lack of understanding and hope it does not take too much of your time to verify this issue. **System Information** Operating system: Windows 10 Pro 64-bit Graphics card: 4095MB NVIDIA GeForce GTX 1080 (NVIDIA) **Blender Version** blender-2.80.0-git.0264d8390fa2-windows64 ( + all previous blender 2.8 tested to date) **Short description of error** A plane has cloth physics enabled. end time in the (cloth physics) cache is changed to say 1000 Several duplicates of this are made. Duplicates resort to 250 end time. Cannot copy end time to selected duplicates either. Only way to change end time for all duplicates is to do it one at a time manually. **Exact steps for others to reproduce the error** create a plane which is pinned at top so that it drops in the z direction add physics cloth to this plane. (I also enabled object (not self) collision but I don't think this is important). Change the cache end time for the cloth to 1000 Duplicate the cloth (plane) several times Then try to make the duplicates have a 1000 end time in the cache.

John L. Gordon commented

2019-05-14 00:20:13 +02:00

Added subscriber: @johnlgordon-4

blender-admin commented

2019-05-14 00:20:13 +02:00

#74515 was marked as duplicate of this issue

blender-admin commented

2019-05-14 00:20:13 +02:00

#64672 was marked as duplicate of this issue

Philipp Oeser commented

2019-05-14 11:31:48 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-05-14 11:31:48 +02:00

Just checking if I get this right:

How are you trying to achieve this?
Is this about selecting multiple objects and Alt+clicking cache end time to enter a new value?

Just checking if I get this right: - How are you trying to achieve this? - Is this about selecting multiple objects and Alt+clicking `cache end time` to enter a new value?

John L. Gordon commented

2019-05-14 13:21:20 +02:00

I was initially simply trying to duplicate a cloth object with the cache end changed.
I had expected the updated value to be in the duplicated object, but it was the original 250.

I also tried to change the simulation end time before duplicating the object but that made no difference.

I have tried selecting one cloth and then the rest (because they are all in a single group).
I did not try alt clicking the end time, just altering it.
However, I have tried alt clicking the end time and altering it now and it still does not update the selected objects.

The balance of probabilities says that this is my mistake and I was waiting for updates to version 2.8.
However, I thought I should at least mention it with the release date approaching.
I am really sorry if I end up causing work for you for nothing.

Basically, I can’t change multiple cloth cache end times other than by changing each one, one at a time.

I was initially simply trying to duplicate a cloth object with the cache end changed. I had expected the updated value to be in the duplicated object, but it was the original 250. I also tried to change the simulation end time before duplicating the object but that made no difference. I have tried selecting one cloth and then the rest (because they are all in a single group). I did not try alt clicking the end time, just altering it. However, I have tried alt clicking the end time and altering it now and it still does not update the selected objects. The balance of probabilities says that this is my mistake and I was waiting for updates to version 2.8. However, I thought I should at least mention it with the release date approaching. I am really sorry if I end up causing work for you for nothing. Basically, I can’t change multiple cloth cache end times other than by changing each one, one at a time.

Philipp Oeser self-assigned this 2019-05-14 14:57:05 +02:00

Philipp Oeser commented

2019-05-14 14:57:05 +02:00

Can confirm Alt+clicking [easiest] doesnt work in this case.
This is because the path to the property on the pointcache cannot be resolved (RNA_path_from_ID_to_property fails).

[this should resolve to something like ob.modifiers['Cloth'].point_cache.frame_end but it doesnt...]

This is true for a couple of properties all around blender and can possibly be fixed [could be a bit tricky since pointcache is used in multiple places], will have a look...

As a workaround, you could just fire a small script:

import bpy

frame_end = 666

for ob in bpy.context.selected_objects:
    for mod_cloth in [mod for mod in ob.modifiers if mod.type == "CLOTH"]:
        mod_cloth.point_cache.frame_end = frame_end

I'll keep this report open for now and retitle so it is more obvious why this fails...

Can confirm Alt+clicking [easiest] doesnt work in this case. This is because the path to the property on the pointcache cannot be resolved (`RNA_path_from_ID_to_property` fails). [this should resolve to something like `ob.modifiers['Cloth'].point_cache.frame_end` but it doesnt...] This is true for a couple of properties all around blender and can possibly be fixed [could be a bit tricky since pointcache is used in multiple places], will have a look... As a workaround, you could just fire a small script: ``` import bpy frame_end = 666 for ob in bpy.context.selected_objects: for mod_cloth in [mod for mod in ob.modifiers if mod.type == "CLOTH"]: mod_cloth.point_cache.frame_end = frame_end ``` I'll keep this report open for now and retitle so it is more obvious why this fails...

Philipp Oeser changed title from ~~can't copy or duplicate cloth cache start or end~~ to RNA_path_from_ID_to_property fails for pointcaches [thus ALT+click does as well...]

2019-05-14 14:57:56 +02:00

Philipp Oeser commented

2019-05-21 21:41:50 +02:00

Added subscriber: @intrah

Philipp Oeser was unassigned by Dalai Felinto

2019-12-23 16:34:25 +01:00

Philipp Oeser self-assigned this 2020-03-11 12:27:19 +01:00

Philipp Oeser commented

2020-03-11 12:27:19 +01:00

Will check again