Modifier Tools: "Viewport Vis" turns off collision modifier,collision modifier has no indicator, or way to re enable except by again pushing viewport vis #53406

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Matt Hoecker · 2017-11-27T21:19:27+01:00

Matt Hoecker commented

2017-11-27 21:19:27 +01:00

Windows 7 64 bit
GTX 970
16GB RAM

Blender 2.79 Official (5bd8ac9)

When an object is set as a collision object in cloth, softbodies and particle simulations, and the "Viewport Vis" button is pressed above the modifier stack, the object's collision modifier is turned off. This may be correct behavior, however, as the collision modifier has no visibility toggle button (the eye) like other modifiers do, there is no way to tell that it is disabled, nor a button to re enable, except for again pushing the "viewport vis" button.

I was pulling my hair out trying to figure out why my cloth simulation stopped colliding with some of my objects. I had disabled all modifiers via the viewport vis button, then turned some of them back on individually (using the little eye icons). I did not realize that this had also turned off the collision modifier (as there is no indicator.) I first fixed it by going to the physics panel and removing the collision modifier (hitting the white X) and then re enabling it. This then led me to the conclusion that when I had hit the viewport vis button it had disabled collisions. I retested in a new file and confirmed this is the exhibited behavior.
Steps to reproduce:
1.Set up a cloth sim (I know you don't need this, but for the sake of being thorough):
Subdivide default cube as needed and set as collision.
Add a plane above cube, subdivide as needed and add cloth modifier and enable collisions.
Sim results as expected.

Enable the Modifier Tools Addon in the addons panel.
Go to the modifiers panel, click viewport vis.
Alt-A to sim. Now results in no collision with cube.
Hit viewport vis button again, collision is restored.

This behavior makes sense, but with no indicator or specific switch for the collision modifier, in instances like above where you don't know it's off, it can be very confusing.

Once again, thank you for your very hard work. The Blender community and myself are ever grateful.

This is easy enough to set up but I can add a file if needed.

Windows 7 64 bit GTX 970 16GB RAM Blender 2.79 Official (5bd8ac9) When an object is set as a collision object in cloth, softbodies and particle simulations, and the "Viewport Vis" button is pressed above the modifier stack, the object's collision modifier is turned off. This may be correct behavior, however, as the collision modifier has no visibility toggle button (the eye) like other modifiers do, there is no way to tell that it is disabled, nor a button to re enable, except for again pushing the "viewport vis" button. I was pulling my hair out trying to figure out why my cloth simulation stopped colliding with some of my objects. I had disabled all modifiers via the viewport vis button, then turned some of them back on individually (using the little eye icons). I did not realize that this had also turned off the collision modifier (as there is no indicator.) I first fixed it by going to the physics panel and removing the collision modifier (hitting the white X) and then re enabling it. This then led me to the conclusion that when I had hit the viewport vis button it had disabled collisions. I retested in a new file and confirmed this is the exhibited behavior. **Steps to reproduce:** 1.Set up a cloth sim (I know you don't need this, but for the sake of being thorough): Subdivide default cube as needed and set as collision. Add a plane above cube, subdivide as needed and add cloth modifier and enable collisions. Sim results as expected. 2. Enable the Modifier Tools Addon in the addons panel. 3. Go to the modifiers panel, click viewport vis. 4. Alt-A to sim. Now results in no collision with cube. 5. Hit viewport vis button again, collision is restored. This behavior makes sense, but with no indicator or specific switch for the collision modifier, in instances like above where you don't know it's off, it can be very confusing. Once again, thank you for your very hard work. The Blender community and myself are ever grateful. This is easy enough to set up but I can add a file if needed.

Matt Hoecker commented

2017-11-27 21:19:27 +01:00

Changed status to: 'Open'

Matt Hoecker commented

2017-11-27 21:19:27 +01:00

Added subscriber: @MatthewHoecker

Vuk Gardašević commented

2017-11-28 07:01:57 +01:00

Added subscriber: @VukGardasevic

Vuk Gardašević commented

2017-11-28 07:01:57 +01:00

I can confirm the issue. From a standpoint of the add-on it just loops through the modifiers and flips a property. However it can be frustrating for sure.
Nevertheless, I'm not sure why Collision not available in the UI in the template_modifier or it is not exposed in the Physics panel when calling physics_add?

There are two possibilities:

I can from the add-on standpoint skip some modifiers that don't have visibility exposed (like collision and give a message about it)
If there are no issues with the Collision modifier the template_modifier should expose the properties for it in the template_modifier and PHYSICS_PT_add

It all depends on the reasons why it is not exposed.

I can confirm the issue. From a standpoint of the add-on it just loops through the modifiers and flips a property. However it can be frustrating for sure. Nevertheless, I'm not sure why *Collision* not available in the UI in the `template_modifier` or it is not exposed in the Physics panel when calling physics_add? There are two possibilities: - I can from the add-on standpoint skip some modifiers that don't have visibility exposed (like collision and give a message about it) - If there are no issues with the Collision modifier the template_modifier should expose the properties for it in the template_modifier and `PHYSICS_PT_add` It all depends on the reasons why it is not exposed.

Matt Hoecker commented

2017-11-28 10:19:04 +01:00

This was my conclusion as we’ll. There would not seem to be an apparent reason that the collision modifier would not be like other physics modifiers and have the same UI design, with the enable/disable icon. There have been some times I’ve wanted to disable it, but instead had to remove and reapply it in the physics panel (luckily it retains its settings.) I’m sure that there is a reason, there always is.

My vote, if there isn’t a good enough reason not to, would be to just use the template_modifier for the collision modifier and give it the same enable disable capabilities as the other modifiers. Seems like a potentially useful feature anyway. Just my 2 cents.

This was my conclusion as we’ll. There would not seem to be an apparent reason that the collision modifier would not be like other physics modifiers and have the same UI design, with the enable/disable icon. There have been some times I’ve wanted to disable it, but instead had to remove and reapply it in the physics panel (luckily it retains its settings.) I’m sure that there is a reason, there always is. My vote, if there isn’t a *good enough* reason not to, would be to just use the template_modifier for the collision modifier and give it the same enable disable capabilities as the other modifiers. Seems like a potentially useful feature anyway. Just my 2 cents.

blender-admin commented

2017-12-06 05:19:39 +01:00

This issue was referenced by e12f817f63

This issue was referenced by e12f817f63bea7b17fe2a09e9bd930434e5d7e43

blender-admin commented

2017-12-06 05:19:39 +01:00

This issue was referenced by 9077f67a5a

This issue was referenced by 9077f67a5ae07038e97cffa659dd11b56af22c5e

Vuk Gardašević commented

2017-12-06 05:21:44 +01:00

Changed status from 'Open' to: 'Resolved'

Vuk Gardašević closed this issue

2017-12-06 05:21:44 +01:00

Vuk Gardašević commented

2017-12-06 05:25:50 +01:00

@MatthewHoecker After talks on IRC with developers, the Collision was UI disabled for a reason, as it would produce undesirable effects with some scenes. Modifier tools will skip them for now.

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Modifier Tools: "Viewport Vis" turns off collision modifier,collision modifier has no indicator, or way to re enable except by again pushing viewport vis #53406