Surface Deform before a Hair Guide node (e.g. Clump/Curl) jitters when surface is animated (placing the Surface Deform after seems fine) #109285

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opened 2023-06-23 12:51:09 +02:00 by Chris Jones · 17 comments

Chris Jones commented

2023-06-23 12:51:09 +02:00

System Information
Operating system: Windows 11 Pro (Windows-10-10.0.22621-SP0 64 Bits)
Graphics card: Intel(R) UHD Graphics 770 Intel 4.5.0 - Build 31.0.101.3959

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: No versions that I'm aware of.

Short description of error
Moving an object with hair assets causes the hair to move randomly. In the example file the issue seems most pronounced when using the Curl Hair Curves modifier and bones to move the object, however the same results can be reproduced in a more complex scene with the Interpolate Hair Curves, Frizz Hair Curves and Hair Curves Noise modifiers (and possibly others).

Exact steps for others to reproduce the error

Add Empty Hair to the default cube
Add some hair in Sculpt mode
Add Curl Hair Curves asset to the hair
Add a bone to the cube and apply some rotation keyframes to it
Play back the animation and observe the hair jittering spasmodically

or just load the attached file and press play.

[Based on the default startup or an attached .blend file (as simple as possible)]

**System Information** Operating system: Windows 11 Pro (Windows-10-10.0.22621-SP0 64 Bits) Graphics card: Intel(R) UHD Graphics 770 Intel 4.5.0 - Build 31.0.101.3959 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: No versions that I'm aware of. **Short description of error** Moving an object with hair assets causes the hair to move randomly. In the example file the issue seems most pronounced when using the Curl Hair Curves modifier and bones to move the object, however the same results can be reproduced in a more complex scene with the Interpolate Hair Curves, Frizz Hair Curves and Hair Curves Noise modifiers (and possibly others). **Exact steps for others to reproduce the error** 1. Add Empty Hair to the default cube 2. Add some hair in Sculpt mode 3. Add Curl Hair Curves asset to the hair 4. Add a bone to the cube and apply some rotation keyframes to it 5. Play back the animation and observe the hair jittering spasmodically - or just load the attached file and press play. [Based on the default startup or an attached .blend file (as simple as possible)]

Hair Jitter.blend

6.7 MiB

Chris Jones added the

labels 2023-06-23 12:51:09 +02:00

Chris Jones changed title from ~~Hair Jitter~~ to Animated Hair Jitters

2023-06-23 12:53:03 +02:00

Iliya Katushenock added the

labels 2023-06-23 12:53:23 +02:00

Philipp Oeser commented

2023-06-23 13:13:24 +02:00

Member

Seems the nodegrous with guides are affected: https://docs.blender.org/manual/en/4.0/modeling/geometry_nodes/hair/guides/index.html

If you move the Surface Deform after such node, the jitter will go away.
Not sure though if this will give you the same results in all cases.

Not quite sure what is causing this (the nodegroups are quite complex), will confirm for now though (since this seems like unexpected behavior to me).

Maybe @SimonThommes or @DanielBystedt can comment? (feel free to close if this is expected behaior).

Seems the nodegrous with guides are affected: https://docs.blender.org/manual/en/4.0/modeling/geometry_nodes/hair/guides/index.html If you move the `Surface Deform` after such node, the jitter will go away. Not sure though if this will give you the same results in all cases. Not quite sure what is causing this (the nodegroups are quite complex), will confirm for now though (since this seems like unexpected behavior to me). Maybe @SimonThommes or @DanielBystedt can comment? (feel free to close if this is expected behaior).

Philipp Oeser added

Nodes & Physics

and removed

labels 2023-06-23 13:13:56 +02:00

Philipp Oeser changed title from ~~Animated Hair Jitters~~ to Surface Deform before a Hair Guide node (e.g. Clump/Curl) jitters when surface is animated (placing the Surface Deform after seems fine)

2023-06-23 13:15:25 +02:00

Simon Thommes commented

2023-06-23 14:41:20 +02:00

Member

This is actually expected behavior. This is the case for all nodes, not just the guide ones, though I put a large emphasis on trying to retain as much stability as currently possible.
Just logically, if you do the deformation before other procedural operations those will be influenced, so the deformation should always come last, if the desired result is stability.

If this isn't clear enough, it might be worth emphasizing in the docs, but the reason this is unclear right now is also, that deformation is only supported in a rudimentary way right now.
There are still some open questions on how to present this in a more clear way to the user, which will need to be addressed, when hair dynamics are properly supported. But for now that is something the user needs to manage themselves properly.

Note: The Add Fur operator gives the proper example setup with the deform modifier at the end of the stack.

This is actually expected behavior. This is the case for all nodes, not just the guide ones, though I put a large emphasis on trying to retain as much stability as currently possible. Just logically, if you do the deformation before other procedural operations those will be influenced, so the deformation should always come last, if the desired result is stability. If this isn't clear enough, it might be worth emphasizing in the docs, but the reason this is unclear right now is also, that deformation is only supported in a rudimentary way right now. There are still some open questions on how to present this in a more clear way to the user, which will need to be addressed, when hair dynamics are properly supported. But for now that is something the user needs to manage themselves properly. Note: The `Add Fur` operator gives the proper example setup with the deform modifier at the end of the stack.

Philipp Oeser commented

2023-06-23 15:12:37 +02:00

Member

OK, thx explaining, will close then.
Making this clearer in the docs would still be good in my opinion.

OK, thx explaining, will close then. Making this clearer in the docs would still be good in my opinion.

Philipp Oeser closed this issue

2023-06-23 15:12:39 +02:00

Blender Bot added

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labels 2023-06-23 15:12:41 +02:00

Chris Jones commented

2023-06-24 04:48:46 +02:00

Author

Unfortunately this doesn't resolve the issue in my main project; moving Surface Deform to the bottom of the modifier stack only makes a mess of the interpolated hair positions (see .gifs). I'm now working to produce a cut-down version of this file.

Unfortunately this doesn't resolve the issue in my main project; moving Surface Deform to the bottom of the modifier stack only makes a mess of the interpolated hair positions (see .gifs). I'm now working to produce a cut-down version of this file.

Jitter2.gif

3.8 MiB

Jitter1.gif

4.6 MiB

Chris Jones reopened this issue

2023-06-24 04:48:48 +02:00

Blender Bot added

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labels 2023-06-24 04:48:50 +02:00

Chris Jones commented

2023-06-24 07:31:21 +02:00

Author

Ok I've managed to reproduce it in the original file with Surface Deform at the bottom of the stack, by reconfiguring it as follows:

The original plane object has been subdivided, and a new subdivided plain has been added
The original hair plane is bound to the new plane via a Surface Deform modifier
The new plane is being rotated with a bone
A Shrinkwrap Hair Curves asset has been added to the hair
Hair curves with extra points, length and combing were added before the issue started to reappear

Enabling both Shrinkwrap Hair Curves and Frizz Hair Curves causes some twitching, while Interpolate Hair Curves invokes more severe motion. It seems as though the object's Surface Deform modifier may be in conflict with the Surface Deform modifier on the hair.

Incidentally, this configuration is necessary for applying smaller portions of hair (such as scalp hair or eyebrows) to a larger object (such as a body) to reduce the surface area on which the calculations need to be made, as well as for easily transferring hair to other characters.

Ok I've managed to reproduce it in the original file with Surface Deform at the bottom of the stack, by reconfiguring it as follows: 1. The original plane object has been subdivided, and a new subdivided plain has been added 2. The original hair plane is bound to the new plane via a Surface Deform modifier 3. The new plane is being rotated with a bone 4. A Shrinkwrap Hair Curves asset has been added to the hair 5. Hair curves with extra points, length and combing were added before the issue started to reappear Enabling both Shrinkwrap Hair Curves and Frizz Hair Curves causes some twitching, while Interpolate Hair Curves invokes more severe motion. It seems as though the object's Surface Deform modifier may be in conflict with the Surface Deform modifier on the hair. Incidentally, this configuration is necessary for applying smaller portions of hair (such as scalp hair or eyebrows) to a larger object (such as a body) to reduce the surface area on which the calculations need to be made, as well as for easily transferring hair to other characters.

Hair Jitter 2.blend

8.9 MiB

YimingWu commented

2023-06-24 07:47:33 +02:00

Member

Probably related: #107856

Probably related: #107856

Simon Thommes commented

2023-06-24 13:01:38 +02:00

Member

A Shrinkwrap Hair Curves asset has been added to the hair

Well, now that part is a different issue. The shwrinkwrap modifier takes the deformed mesh as an input before the curves are deformed, thus leading to instability. Something we could do for consistency is to also add a rest position toggle to this node, to use the undeformed scalp mesh, another thing would be to potentially turn on the Surface Rest Position toggle by default. I'm actually not sure right now why we ended up not doing that. I don't see these as crucial enough of a change for 3.6 though.

@ChrisJones
For your specific issue: Make sure that the Surface Rest Position toggle is enabled in the interpolate modifier. For the shrinkwrap modifier, you need to either do it after the surface deform, or use an undeformed version of the scalp mesh.
Essentially: Whatever comes before the surface deform needs to use the base mesh in rest position, whatever comes after needs to use the deformed position. Whenever you reference an object that will by default be used in its final deformed state, but the Surface Rest Position toggle will instead use the undeformed version to avoid specifically the issue you are experiencing.

So for now I'd classify this as a user error/known issue, as the right version of the base mesh needs be used in the right context. Ideally the user wouldn't need to worry about any of that in the first place though. And right now it isn't very obvious to the user what even needs to be done.
There is a note in the manual wherever the Surface Rest Position toggle appears, but the need for this makes the system quite fragile and not very intuitive. Again, the Add Fur operator also takes care of this in the setup as an example.
https://docs.blender.org/manual/en/latest/modeling/geometry_nodes/hair/generation/interpolate_hair_curves.html

Overall the situation regarding this right now is less than ideal, as it still requires a more advanced understanding of the system for the user, for something that could also just be inferred by the system. This is part of the issues I mentioned that we need to figure out to fully support deformation and dynamics with the new system, along with a list of other related issues.

It seems as though the object's Surface Deform modifier may be in conflict with the Surface Deform modifier on the hair.

Incidentally, this configuration is necessary for applying smaller portions of hair (such as scalp hair or eyebrows) to a larger object (such as a body) to reduce the surface area on which the calculations need to be made, as well as for easily transferring hair to other characters.

Just to be clear, this has nothing to to with the modifiers on the base mesh, just with deformation in general.

Probably related: #107856

@ChengduLittleA Pretty sure this issue is not directly related.

> 4. A Shrinkwrap Hair Curves asset has been added to the hair Well, now that part is a different issue. The shwrinkwrap modifier takes the deformed mesh as an input before the curves are deformed, thus leading to instability. Something we could do for consistency is to also add a rest position toggle to this node, to use the undeformed scalp mesh, another thing would be to potentially turn on the `Surface Rest Position` toggle by default. I'm actually not sure right now why we ended up not doing that. I don't see these as crucial enough of a change for 3.6 though. @ChrisJones For your specific issue: Make sure that the `Surface Rest Position` toggle is enabled in the interpolate modifier. For the shrinkwrap modifier, you need to either do it after the surface deform, or use an undeformed version of the scalp mesh. Essentially: Whatever comes before the surface deform needs to use the base mesh in rest position, whatever comes after needs to use the deformed position. Whenever you reference an object that will by default be used in its final deformed state, but the `Surface Rest Position` toggle will instead use the undeformed version to avoid specifically the issue you are experiencing. So for now I'd classify this as a user error/known issue, as the right version of the base mesh needs be used in the right context. Ideally the user wouldn't need to worry about any of that in the first place though. And right now it isn't very obvious to the user what even needs to be done. There is a note in the manual wherever the Surface Rest Position toggle appears, but the need for this makes the system quite fragile and not very intuitive. Again, the Add Fur operator also takes care of this in the setup as an example. https://docs.blender.org/manual/en/latest/modeling/geometry_nodes/hair/generation/interpolate_hair_curves.html Overall the situation regarding this right now is less than ideal, as it still requires a more advanced understanding of the system for the user, for something that could also just be inferred by the system. This is part of the issues I mentioned that we need to figure out to fully support deformation and dynamics with the new system, along with a list of other related issues. > It seems as though the object's Surface Deform modifier may be in conflict with the Surface Deform modifier on the hair. > > Incidentally, this configuration is necessary for applying smaller portions of hair (such as scalp hair or eyebrows) to a larger object (such as a body) to reduce the surface area on which the calculations need to be made, as well as for easily transferring hair to other characters. Just to be clear, this has nothing to to with the modifiers on the base mesh, just with deformation in general. > Probably related: #107856 @ChengduLittleA Pretty sure this issue is not directly related.

Simon Thommes commented

2023-06-24 13:07:54 +02:00

Member

@JacquesLucke @dfelinto
I don't recall if this overall situation is something we already meant to prioritize for 4.0. We definitely talked about these things in the past though regarding the new system not fully supporting animation/dynamics yet. Question is how and when we can follow up on that.

@JacquesLucke @dfelinto I don't recall if this overall situation is something we already meant to prioritize for 4.0. We definitely talked about these things in the past though regarding the new system not fully supporting animation/dynamics yet. Question is how and when we can follow up on that.

Chris Jones commented

2023-06-24 14:12:52 +02:00

Author

Furthermore, I've found that moving the Surface Deform modifier after the Interpolate Hair Curves modifier on the vellus hair (which is attached directly to the main body object) throws an "Invalid surface UVs" error, and consequently the interpolated hairs ripple and disappear on the model. It's possible this is caused by an unrelated issue, but nonetheless I've stripped the file down to a small section, and the behaviour can be observed by playing the animation and shifting Surface Deform above/below Interpolate Hair Curves.

The only recourse available in this instance is to keep Interpolate Hair Curves after Surface Deform, which means modifiers like Frizz and Noise have to go before Interpolate Hair Curves, and that's no good because then they only broadly affect the guide hairs instead of the individual interpolated ones.

[Edit] @SimonThommes Sorry I missed your responses as I was busy with this comment, so I'll follow up in regard to those if necessary - thanks!

Furthermore, I've found that moving the Surface Deform modifier after the Interpolate Hair Curves modifier on the vellus hair (which is attached directly to the main body object) throws an "Invalid surface UVs" error, and consequently the interpolated hairs ripple and disappear on the model. It's possible this is caused by an unrelated issue, but nonetheless I've stripped the file down to a small section, and the behaviour can be observed by playing the animation and shifting Surface Deform above/below Interpolate Hair Curves. The only recourse available in this instance is to keep Interpolate Hair Curves after Surface Deform, which means modifiers like Frizz and Noise have to go _before_ Interpolate Hair Curves, and that's no good because then they only broadly affect the guide hairs instead of the individual interpolated ones. [Edit] @SimonThommes Sorry I missed your responses as I was busy with this comment, so I'll follow up in regard to those if necessary - thanks!

3.7 MiB

Vellus.blend

8.7 MiB

Simon Thommes commented

2023-06-24 21:29:10 +02:00

Member

Furthermore, I've found that moving the Surface Deform modifier after the Interpolate Hair Curves modifier on the vellus hair (which is attached directly to the main body object) throws an "Invalid surface UVs" error

That's yet another unrelated issue with the subdivision surface modifiers UV smoothing, which can only be done on the mesh and leaves some of the curves without proper mapping. That issue is documented here: https://docs.blender.org/manual/en/3.5/modeling/geometry_nodes/curve/operations/deform_curves_on_surface.html

As I said, there is a list of known issues related to this topic, which is why we need to invest more work into this before we can say that animation and dynamics are fully supported.

> Furthermore, I've found that moving the Surface Deform modifier after the Interpolate Hair Curves modifier on the vellus hair (which is attached directly to the main body object) throws an "Invalid surface UVs" error That's yet another unrelated issue with the subdivision surface modifiers UV smoothing, which can only be done on the mesh and leaves some of the curves without proper mapping. That issue is documented here: https://docs.blender.org/manual/en/3.5/modeling/geometry_nodes/curve/operations/deform_curves_on_surface.html As I said, there is a list of known issues related to this topic, which is why we need to invest more work into this before we can say that animation and dynamics are fully supported.

Iliya Katushenock removed the

Nodes & Physics

label 2023-06-25 01:17:12 +02:00

Chris Jones commented

2023-06-25 17:34:05 +02:00

Author

Fair enough, in that case perhaps I'll revisit the hair system once it's animation ready. If it's of any benefit in the meantime, I'll address your suggestions and summarise my experience with the hair assets in relation to my project:

Enabling Surface Rest Position in the Interpolate Hair Curves modifier detaches the hair from its surface, unless it has been added via the Add Fur operator.
The "Invalid Surface UVs" error is unavoidable unless the Surface Deform modifier is before Interpolate Hair Curves, even when using the Add Fur operator or changing the object's UV smoothing.
If Surface Deform is before Interpolate Hair Curves, it makes the interpolated hairs jitter.
If Surface Deform is after Interpolate Hair Curves, it still makes the hairs jitter, and adds a rippling effect to the hair length.

In short, the hair assets are fine for rendering stills, but I can't find any configuration that keeps the hair attached and static if the object is moving. Particle hair works without issue the same model however.

Fair enough, in that case perhaps I'll revisit the hair system once it's animation ready. If it's of any benefit in the meantime, I'll address your suggestions and summarise my experience with the hair assets in relation to my project: Enabling Surface Rest Position in the Interpolate Hair Curves modifier detaches the hair from its surface, unless it has been added via the Add Fur operator. The "Invalid Surface UVs" error is unavoidable unless the Surface Deform modifier is before Interpolate Hair Curves, even when using the Add Fur operator or changing the object's UV smoothing. If Surface Deform is before Interpolate Hair Curves, it makes the interpolated hairs jitter. If Surface Deform is _after_ Interpolate Hair Curves, it still makes the hairs jitter, and adds a rippling effect to the hair length. In short, the hair assets are fine for rendering stills, but I can't find any configuration that keeps the hair attached and static if the object is moving. Particle hair works without issue the same model however.

Simon Thommes commented

2023-06-26 16:00:20 +02:00

Member

@ChrisJones Thanks for providing the summary.

Enabling Surface Rest Position in the Interpolate Hair Curves modifier detaches the hair from its surface, unless it has been added via the Add Fur operator.

I'm a bit confused by this point, that might be another bug. Maybe this part is indeed related to #107856
Could you confirm whether this issue persists when the subdiv modifier is applied? And if so create a separate report for that?

The "Invalid Surface UVs" error is unavoidable unless the Surface Deform modifier is before Interpolate Hair Curves, even when using the Add Fur operator or changing the object's UV smoothing.

In that case I'm not sure whether we already have this on the radar. Would be good to also open this as an issue.

If Surface Deform is before Interpolate Hair Curves, it makes the interpolated hairs jitter.

So is this with the rest position toggle off then?
In theory (and to to my experience in practice), the aspect of keeping the hairs stable and consistent with the hair deformation works fine when the rest position toggle is used and the modifier order does the deformation last. It didn't become clear to me whether this was not what you were experiencing or whether you didn't try it because of the problem with the attachment.

@ChrisJones Thanks for providing the summary. > Enabling Surface Rest Position in the Interpolate Hair Curves modifier detaches the hair from its surface, unless it has been added via the Add Fur operator. I'm a bit confused by this point, that might be another bug. Maybe this part is indeed related to #107856 Could you confirm whether this issue persists when the subdiv modifier is applied? And if so create a separate report for that? > The "Invalid Surface UVs" error is unavoidable unless the Surface Deform modifier is before Interpolate Hair Curves, even when using the Add Fur operator or changing the object's UV smoothing. In that case I'm not sure whether we already have this on the radar. Would be good to also open this as an issue. > If Surface Deform is before Interpolate Hair Curves, it makes the interpolated hairs jitter. So is this with the rest position toggle off then? In theory (and to to my experience in practice), the aspect of keeping the hairs stable and consistent with the hair deformation works fine when the rest position toggle is used and the modifier order does the deformation last. It didn't become clear to me whether this was not what you were experiencing or whether you didn't try it because of the problem with the attachment.

Chris Jones referenced this issue

2023-06-27 08:14:04 +02:00

Enabling Surface Rest Position in the Interpolate Hair Curves Modifier Disconnects Hair from Surface Mesh #109398

Chris Jones referenced this issue

2023-06-27 09:07:22 +02:00

Surface Deform Modifier invokes "Invalid surface UVs" error when applied to Hair #109401

Chris Jones commented

2023-06-27 09:10:12 +02:00

Author

I'm a bit confused by this point, that might be another bug. Maybe this part is indeed related to #107856
Could you confirm whether this issue persists when the subdiv modifier is applied? And if so create a separate report for that?

It does indeed persist, and can be verified by applying the Subsurf modifier and enabling Surface Rest Position in the Vellus.blend file above. I've opened a new report: #109398

In that case I'm not sure whether we already have this on the radar. Would be good to also open this as an issue.

The error can also be reproduced in the Vellus file by selecting the Body object and Adding Curve > Fur. It goes away when applying Subsurf though, so I don't know whether that means it's related to #107856 or not. Nonetheless I've added another report (#109401)

Meanwhile, I discovered the UVs had disappeared from the scalp object on my main file, and I can't apply any UVs to it for some reason. So I duplicated a new one from the main mesh and added new hair, and with Surface Deform at the top of the modifier stack the jittering stops far as I can tell. It's still there with Surface Deform at the bottom though, so I think the original point of this report still remains valid. Perhaps the title should be updated to reflect this?

> I'm a bit confused by this point, that might be another bug. Maybe this part is indeed related to #107856 Could you confirm whether this issue persists when the subdiv modifier is applied? And if so create a separate report for that? It does indeed persist, and can be verified by applying the Subsurf modifier and enabling Surface Rest Position in the Vellus.blend file above. I've opened a new report: [#109398](https://projects.blender.org/blender/blender/issues/109398) > In that case I'm not sure whether we already have this on the radar. Would be good to also open this as an issue. The error can also be reproduced in the Vellus file by selecting the Body object and Adding Curve > Fur. It goes away when applying Subsurf though, so I don't know whether that means it's related to [#107856](https://projects.blender.org/blender/blender/issues/107856) or not. Nonetheless I've added another report ([#109401](https://projects.blender.org/blender/blender/issues/109401)) Meanwhile, I discovered the UVs had disappeared from the scalp object on my main file, and I can't apply any UVs to it for some reason. So I duplicated a new one from the main mesh and added new hair, and with Surface Deform at the top of the modifier stack the jittering stops far as I can tell. It's still there with Surface Deform at the bottom though, so I think the original point of this report still remains valid. Perhaps the title should be updated to reflect this?

Chris Jones referenced this issue

2023-06-27 10:20:28 +02:00

Enabling Surface Rest Position in the Interpolate Hair Curves Modifier Disconnects Hair from Surface Mesh #109398

Chris Jones commented

2023-06-27 10:59:52 +02:00

Author

I spoke too soon... I've added the Hair Curves Noise asset to the new hair, and the problem is back - except now it's more of a slower wavy effect - or faster if the Scale value is smaller, which seems to suggest that the noise is operating in world space instead of locally (indicating yet another separate issue I guess).

Also forgot to reply to this:

So is this with the rest position toggle off then?

Correct, it jitters regardless of whether it's on or off.

I spoke too soon... I've added the Hair Curves Noise asset to the new hair, and the problem is back - except now it's more of a slower wavy effect - or faster if the Scale value is smaller, which seems to suggest that the noise is operating in world space instead of locally (indicating yet another separate issue I guess). Also forgot to reply to this: > So is this with the rest position toggle off then? Correct, it jitters regardless of whether it's on or off.

Simon Thommes commented

2023-06-27 16:27:02 +02:00

Member

Unfortunately I don't have time to look into any of this in more detail at the moment. I have the suspicion that there might still be more misunderstandings involved, but regardless, as I pointed out, this comes down to the currently limited support for animation, which is known to be an issue that will need to be resolved before we add dynamics.
We'll revisit the mentioned topics then and its useful to have some files to look at!

Unfortunately I don't have time to look into any of this in more detail at the moment. I have the suspicion that there might still be more misunderstandings involved, but regardless, as I pointed out, this comes down to the currently limited support for animation, which is known to be an issue that will need to be resolved before we add dynamics. We'll revisit the mentioned topics then and its useful to have some files to look at!

Simon Thommes added

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Simon Thommes commented

2023-06-27 16:28:30 +02:00

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Considering everything I'll close this as a known issue for now

Considering everything I'll close this as a known issue for now

Simon Thommes closed this issue

2023-06-27 16:28:32 +02:00

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labels 2023-06-27 16:28:35 +02:00

Philipp Oeser commented

2023-06-29 10:22:45 +02:00

Member

In short, the hair assets are fine for rendering stills, but I can't find any configuration that keeps the hair attached and static if the object is moving. Particle hair works without issue the same model however.

as I pointed out, this comes down to the currently limited support for animation, which is known to be an issue that will need to be resolved before we add dynamics.

Just noting that (for the time being) you could of course do the groom in GN, then convert to the old particle system for animation

>In short, the hair assets are fine for rendering stills, but I can't find any configuration that keeps the hair attached and static if the object is moving. Particle hair works without issue the same model however. >as I pointed out, this comes down to the currently limited support for animation, which is known to be an issue that will need to be resolved before we add dynamics. Just noting that (for the time being) you could of course do the groom in GN, then convert to the old particle system for animation

Chris Jones referenced this issue

2023-08-16 05:21:27 +02:00

Enabling Surface Rest Position in the Interpolate Hair Curves Modifier Disconnects Hair from Surface Mesh #109398

Philipp Oeser referenced this issue

2023-08-25 13:33:11 +02:00

Particle system removal #105316

Philipp Oeser referenced this issue

2024-03-22 13:06:45 +01:00

Hair Guides not following surface deformations #119763

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