Image as Plane cloth error #61640

New Issue

Sergey · 2019-02-17T19:03:49+01:00

Sergey commented

2019-02-17 19:03:49 +01:00

System Information
Operating system: Windows 10 64
Graphics card: Nvidia GTX1060Q

Blender Version
blender-2.80.0-git.0f135f80f271-windows64
Worked: (optional)

Short description of error
Image as Plane in cloth simulation generates distorted mesh while Self Collision is enabled

Exact steps for others to reproduce the error

Import Image as Plane
Subdivide
Assign pinning vertexes group.
Enable Cloth simulation for the Plane.
Select pinning vertexes group for cloth
( simulation will run correctly)
Enable Self Collision.
Start simulation.

 It will generate heavily distorted mesh or crash.

 A plane created from Add Mesh works correctly.

**System Information** Operating system: Windows 10 64 Graphics card: Nvidia GTX1060Q **Blender Version** blender-2.80.0-git.0f135f80f271-windows64 Worked: (optional) **Short description of error** Image as Plane in cloth simulation generates distorted mesh while Self Collision is enabled **Exact steps for others to reproduce the error** 1. Import Image as Plane 2. Subdivide 3. Assign pinning vertexes group. 4. Enable Cloth simulation for the Plane. 5. Select pinning vertexes group for cloth ( simulation will run correctly) 5. Enable Self Collision. 6. Start simulation. ``` It will generate heavily distorted mesh or crash. ``` ``` A plane created from Add Mesh works correctly.

Sergey commented

2019-02-17 19:03:49 +01:00

Added subscriber: @iKeyborg

Stephen Swaney commented

2019-02-17 19:05:26 +01:00

Added subscriber: @StephenSwaney

Stephen Swaney commented

2019-02-17 19:05:26 +01:00

Got a .blend for us?

Sergey commented

2019-02-17 21:25:53 +01:00

IMAGE_PLANE_CLOTH.blend

Please open and run simulation

[IMAGE_PLANE_CLOTH.blend](https://archive.blender.org/developer/F6643825/IMAGE_PLANE_CLOTH.blend) Please open and run simulation

Sergey commented

2019-02-17 21:28:24 +01:00

Please disable Self Collision, It will work.

Marco commented

2019-02-18 12:04:26 +01:00

Added subscriber: @nacioss

Marco commented

2019-02-18 12:04:27 +01:00

Yeah, it does get weird results in your blend.
However, i tried with the latest build of today's 2019-02-18 and it seems to work properly now:

Yeah, it does get weird results in your blend. However, i tried with the latest build of today's 2019-02-18 and it seems to work properly now: ![Screenshot.jpg](https://archive.blender.org/developer/F6648808/Screenshot.jpg)

Sergey commented

2019-02-18 13:35:33 +01:00

I have downloaded blender-2.80.0-git.7d792976e100-windows64 (2019-02-18)

It still doesn't work.

Please don't disable Self Collision and click play.

I have downloaded blender-2.80.0-git.7d792976e100-windows64 (2019-02-18) It still doesn't work. ![image.png](https://archive.blender.org/developer/F6649297/image.png) Please don't disable Self Collision and click play.

Sebastian Parborg commented

2019-02-18 14:48:15 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-02-18 14:48:15 +01:00

If I open that fine and play the animation, I can see the same problem.

However, if I disable self collision AND then re-enable it works.

Does this happen for you too?
If it solves it for you, can you still make this happen when recreating the scene?
I suspect this is something that has been fixed but blend files that were saved when this bug was in is still broken until you toggle the settings.

If I open that fine and play the animation, I can see the same problem. However, if I disable self collision AND then re-enable it works. Does this happen for you too? If it solves it for you, can you still make this happen when recreating the scene? I suspect this is something that has been fixed but blend files that were saved when this bug was in is still broken until you toggle the settings.

Sergey commented

2019-02-18 19:47:11 +01:00

Unfortunately, It doesn't work even after toggling self collision.
I created a cloth model from scratch in 2.18.2019 Blender. I see the same problem. Can it be Preference or Registry corruption?

Unfortunately, It doesn't work even after toggling self collision. I created a cloth model from scratch in 2.18.2019 Blender. I see the same problem. Can it be Preference or Registry corruption?

Sebastian Parborg commented

2019-02-19 10:52:38 +01:00

If Load Factory Settings and save then Save Startup file and save user preferences. Can you still reproduce this?

If `Load Factory Settings` and save then `Save Startup file` and save user preferences. Can you still reproduce this?

Sergey commented

2019-02-20 01:31:49 +01:00

I did everything you suggested with today's build (02.19.2019).
I got a new piece of information. If I create a plane from image and subdivide it to 20x20 mesh, it works. If I divide the image as plane in to 50x50 mesh it doesn't work. If I subdivide 20x20 mesh once it doesn't work as well.

I did everything you suggested with today's build (02.19.2019). I got a new piece of information. If I create a plane from image and subdivide it to 20x20 mesh, it works. If I divide the image as plane in to 50x50 mesh it doesn't work. If I subdivide 20x20 mesh once it doesn't work as well.

Sebastian Parborg commented

2019-02-20 14:55:54 +01:00

Does it help if you increase the number of quality steps of the simulation to 20 or so?

Sergey commented

2019-02-20 18:46:10 +01:00

Quality steps don't help. Max working subdivision factor is 25x25.
26x26 doesn't nork
I installed 2/20/2019 version on a different old laptop never used for blender.
I does same thing. Do you import image as plane? What is difference between plane from Add Mesh and imported image?

Quality steps don't help. Max working subdivision factor is 25x25. 26x26 doesn't nork I installed 2/20/2019 version on a different old laptop never used for blender. I does same thing. Do you import image as plane? What is difference between plane from Add Mesh and imported image?

Sebastian Parborg commented

2019-02-21 14:54:40 +01:00

I don't think this is an add plane issue. It is just a general stability issue with simulations.

If you add a normal plane it is 2x2meters. The import as plane defaults to 1m
The add image as plane makes the imported plane rectangular (unless the image size is square).

What happens here is that the solver for the cloth sim has a hard time to find a solution to the simulation.
This case it hard because of the smaller size and that you have pinned all edge verts on one side.
Additionally the plane is collapsing in on itself.

In the example you attached, the distance between the verts on the flag horizonatally is ~0.02m. In the self collision settings, you can see that the amount of distance you want to keep between the self colliding verts are 0.015m. As you can guess this leaves very little space for the flag to have the verts move. So you can set it to 0.001m instead and it should be better.

Can you confirm that changing the value to 0.001m works for you?

I don't think this is an add plane issue. It is just a general stability issue with simulations. If you add a normal plane it is 2x2meters. The import as plane defaults to 1m The add image as plane makes the imported plane rectangular (unless the image size is square). What happens here is that the solver for the cloth sim has a hard time to find a solution to the simulation. This case it hard because of the smaller size and that you have pinned all edge verts on one side. Additionally the plane is collapsing in on itself. In the example you attached, the distance between the verts on the flag horizonatally is ~0.02m. In the self collision settings, you can see that the amount of distance you want to keep between the self colliding verts are 0.015m. As you can guess this leaves very little space for the flag to have the verts move. So you can set it to 0.001m instead and it should be better. Can you confirm that changing the value to 0.001m works for you?

Sergey commented

2019-02-22 01:53:17 +01:00

Sebastian,

    Thank you.

Now it works like a charm.

    Sorry, I wasted your time. I did not find a good explanation for all cloth parameters and they are little bit different from 2.79.

I think little diagnostic or error message if self-collision distance is bigger than minimum mesh cell would be helpful to avoid some simulation errors.
Looks like only self-collision distance can prevent from self-penetration: not too big to keep simulation successful and not too small to prevent self- penetration. Is there another way to prevent self-penetration?

Sergey

Sebastian, ``` Thank you. ``` Now it works like a charm. ``` Sorry, I wasted your time. I did not find a good explanation for all cloth parameters and they are little bit different from 2.79. ``` I think little diagnostic or error message if self-collision distance is bigger than minimum mesh cell would be helpful to avoid some simulation errors. Looks like only self-collision distance can prevent from self-penetration: not too big to keep simulation successful and not too small to prevent self- penetration. Is there another way to prevent self-penetration? Sergey

Sebastian Parborg commented

2019-02-22 10:56:51 +01:00

Changed status from 'Open' to: 'Archived'

Sebastian Parborg closed this issue

2019-02-22 10:56:51 +01:00

Sebastian Parborg self-assigned this 2019-02-22 10:56:51 +01:00

Sebastian Parborg commented

2019-02-22 10:56:51 +01:00

Self-collision is the only way to prevent it falling through itself in this case.

There could perhaps be some kind of self diagnostics as you said, however that is move of a feature request (so not something for this bug tracker).

There have been talks about replacing the cloth and particle system in the future. So these areas are currently not worked on that much (as they will probably be replaced).

Self-collision is the only way to prevent it falling through itself in this case. There could perhaps be some kind of self diagnostics as you said, however that is move of a feature request (so not something for this bug tracker). There have been talks about replacing the cloth and particle system in the future. So these areas are currently not worked on that much (as they will probably be replaced).

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Image as Plane cloth error #61640