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TOPIC: Binding and Reference Pose

Binding and Reference Pose 5 months 1 week ago #163

  • mjwt
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I am trying to create a binding between a cloth object and a collision object, however I find that if I have a reference pose connected to my cloth, the bind will be created at the point positions of the reference pose instead of the point positions of where it is originally. Is there a way around this?
To give more context, I am trying to bind a waistband to a character's waist, and the reference pose coming in are tailor panels where the waistband is flat. When I turn on the binding node guide geometry, I can see the binding lines attached from the point position of the flat waistband.

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Binding and Reference Pose 5 months 1 week ago #165

  • JC
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Hi,
I suspect the issue is that you are using the reference pose of the cloth which is the set of 2D panels in the cloth reference space as a reference for the binding in combination with the 3D character which is in simulation space. Each object and constraint can have a different set of reference poses that don't need to be the same between objects and constraints for example. In your case, you need a reference pose for the binding combining a pose of the 3D cloth and a pose of the character in the same space with the relative configuration you wish for the constrained points. For example, you could use the start mesh of the cloth and the start mesh of the character and potentially set the surface offset to bind the wristband at a uniform distance from the collider surface. The current simulation poses of the parent or the child object of the binding can be used too by simply not providing a parent or a child mesh. The binding will then generate the constraints based on the objects topology and using the current positions from the carbon simulation objects.

If this does not fix your binding problem, then we might need a Maya example so we can identify either an interface issue, a bug on our side or the need of a good tutorial.

Cheers, JC

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Binding and Reference Pose 5 months 1 week ago #166

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Thanks for your quick reply JC.

Actually I meant to post this in the Houdini side of the forum, I apologize if the way I described it sounded confusing but I hope it doesn't change your answer too much.

Yes I am using the 2D panel cloth as the reference pose, and without hooking up the reference pose, the binding would work in simulation space with the waistband properly attached to the model. Based on what you've mentioned, does that mean the binding node will always use the point positions from the reference pose to bind to a collision object?

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Binding and Reference Pose 5 months 1 week ago #167

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Moved to Carbon for Houdini section - admin

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Binding and Reference Pose 5 months 1 week ago #169

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My response must have been very confusing now that the question is moved to be about Houdini. Because we have iterated the system while implementing the Maya beta plugin and we now have a much clearer and more powerful reference pose setup and animation formulation. The good news is that this improvement will be available shortly in Houdini since we have ported it and finished testing it.
Now if you are bound to use your current version of the Houdini plugin, can you specify which version it is so we can go back in the plugin history to investigate and see if this is not a bug that we could patched up. Because in the case of a tailored cloth, constraints such as binding, stitching etc... should not use the 2D panels of the cloth in the reference computation and use the start pose instead.
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Binding and Reference Pose 5 months 1 week ago #170

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Thanks JC, that clears it up. I went back to watch the new video for Carbon's Maya plugin and realised you were talking about the new features.
I am currently using Version 9.1.2, Carbon Version 7.1.0 in Houdini.

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Binding and Reference Pose 5 months 1 week ago #183

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Hi mjwt,

We have just released a new build, Version 9.2.0, which includes a fix to this issue.
Please speak to whoever is managing your Carbon installs for access.
It also includes a lot of new features, which are outlined in this short video:
9.2.0 Feature Overview

Cheers,
Sebastian
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Binding and Reference Pose 4 months 2 weeks ago #203

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Hi, just wanted to reply back about this issue. I've tested on the new version 9.2.0 in Houdini and this bug has been fixed and it is now binding properly.
Thank you!
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Binding and Reference Pose 4 months 2 weeks ago #207

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Great thanks for letting us know.

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