Carbon Stitching¶
Description¶
A Stitching is a collection of attachments between one or several pairs of Carbon Cloth/Carbon Tetra nodes. Each attachment is a collection of constraints called Stitches pairing points from each of the Carbon Cloth/Carbon Tetra nodes involved.
Two Carbon Cloth/Carbon Tetra objects are required to define each attachment, and an ordered Houdini point Group within each Carbon Cloth/Carbon Tetra reference pose geometry is required to assemble the pairs of Carbon Cloth /Carbon Tetra points constrained by Stitches.
Note
The Houdini point Group needs to be ordered, otherwise no ordered stitches will be established.
The correct way to create these groups is:
- Select each of the vertices in a specific order from the first part of the cloth/tetra geometry you want to stitch.
- Click on the Model toolbar, icon Group (or hit tab while the mouse is over the viewport and type group).
- In the group parameters, tick Create Ordered.
- Repeat the three operations above on the other cloth/tetra (or the other side of the cloth/tetra you are stitching to itself) while making sure the order and number of points selected is respected.
Attach this node after a merge node that the Carbon Cloth / Carbon Tetra node(s) are connected to, then use the drop down menus to select the Carbon Cloth / Carbon Tetra objects and groups from their lists.
A Stitching.
Note
The Carbon Stitching relationship uses the same stretch Stiffness/Viscosity constraint as the Carbon Cloth Stretch model.
Inputs¶
Input #1: objects
All objects referenced by this relationship must also be connected to this input through a Houdini Merge node for the Carbon Stitching node to operate within the Carbon Simulation it is connected to.
Parameters¶
Activation activation
Enable this relationship. Use 0 to disable, any other value to enable.
Properties
Animated propertiesAnimated
Update the following property values for this constraint at every frame.
Note
It’s good practice to leave this toggled off when not using
animated parameters because it impacts performance.
)Viscosity viscosity
Stretch viscosity (dimensionless).
Similar to the Carbon Cloth Stretch Viscosity.
See also
Compression compression
Stitching compression, must be strictly greater than 0 and always be smaller than or equal to extension.
Similar to the Carbon Cloth Stretch Compression.
See also
Extension extension
Stitching extension, must be strictly greater than 0 and always greater than or equal to compression.
Similar to the Carbon Cloth Stretch Extension.
See also
Equilibrium equilibrium
Stitching resting length (equilibrium) as a ratio of the reference length.
Use 1 for the default reference length.
Similar to the Carbon Cloth Stretch Equilibrium.
See also
Stitching Pairs
Stitching Count count
The number of stitching pairs created from this node.
Cloth/Tetra A clothA#
The Carbon Cloth/Carbon Tetra object name to use with this constraint.
Cloth/Tetra B clothB#
The Carbon Cloth/Carbon Tetra object name to use with this constraint.
This can be the same object as in Cloth/Tetra A.
Reference
Animated referenceAnimated#
Update the following property values for this constraint at every frame.
Note
It’s good practice to leave this toggled off when not using
animated parameters because it impacts performance.
Point Group A groupA#
The points from Cloth/Tetra A’s geometry that are used for the stitching. Must be the same number of points as Point Group B.
Point Group B groupB#
The points from Cloth/Tetra B’s geometry that are used for the stitching. Must be the same number of points as Point Group A.
Parent Pose parentMesh#
Cloth/Tetra A’s pose in the stitching reference space.
Note
This parameter is optional.
Child Pose childMesh#
Cloth/Tetra B’s pose in the stitching reference space.
Note
This parameter is optional.
Properties Override propertiesOverride#
Allows to specify individual properties for this constraint pair, therefore ignoring the local properties set above for the node.
Properties
Animated propertiesAnimated#
Update the following property values for this constraint at every frame.
Note
It’s good practice to leave this toggled off when not using
animated parameters because it impacts performance.
Viscosity viscosity#
Stretch viscosity (dimensionless).
Similar to the Carbon Cloth Stretch Viscosity.
See also
Compression compression#
Stretch compression, must be strictly greater than 0 and always be smaller than or equal to extension.
Similar to the Carbon Cloth Stretch Compression.
See also
Extension extension#
Stitching extension, must be strictly greater than 0 and always greater than or equal to compression.
Similar to the Carbon Cloth Stretch Extension.
See also
Equilibrium equilibrium#
Stitching resting length (equilibrium) as a ratio of the reference length.
Use 1 for the default reference length.
Similar to the Carbon Cloth Stretch Equilibrium.
See also
Parameter File¶
Use Parameter File fileOverride
Replace parameter values by expressions fetching the values from the loaded parameter file. Parameter values from the exclusion filter are left unchanged.
File Name fileName
Json file path to save this node’s current parameters to, and load the parameter file from.
Save save
Save this node’s current parameters to the specified file.
Load load
Load or reload the specified parameter file. As the overriding expressions always fetch values from the last loaded parameter file, and not from the file itself, use this button to refresh the loaded current parameter file with the values on disk.
Reload Every Time The Node Is Loaded reload
Automatically reload the parameter file when the scene is loaded. If the specified file cannot be found then the overriding expressions will use the values of the last loaded parameter file instead.
Exclusion Filter exclusionFilter
The exclusion filter allows to select which of the parameters are not to be replaced by the overriding expressions, therefore keeping their original values while all other parameters will evaluate with the values set from the last loaded parameter file.
Guide Geometry¶
Show Stitches showguide
Display the stitches as colored lines between the Cloth/Tetra A and Cloth/Tetra B objects.
Stitches colorStitchesr colorStitchesg colorStitchesb
Color used to draw the stitches when Show Stitches is toggled on.
Examples¶
$SIMCARBONTOOL_PATH/documentation/_downloads/stitching.hip
$SIMCARBONTOOL_PATH/documentation/_downloads/stitching_sop.hip