| Since | 21.0 |
This component sets up a spline solver and adds the controls for either a tangent control or a custom setup by the user. This component can be run in a loop over different segments, or parts, of the character.
See rigging a character for an example use of this component.
Parameters ¶
Name
The name to add to the nodes created by this component. When using Segments, the segment name is also added to the nodes.
Settings ¶
Type
The type of spline curve to create from the CVs (control vertices).
Curve Order
The order of the Bezier curve to build from the CVs. Defaults to 2 (linear Bezier curve).
Each segment of a Bezier curve requires that <number_of_cvs> = order. Compound curves share a CV between their curve segments, so each additional curve segment requires an additional order-1 CVs. This requirement can be expressed by the equation <number_of_cvs> % (order-1) == 1.
Order 3 and 4 curves are popular choices for ensuring that each CV has a relatively local impact on the shape of the curve while allowing for the smoothness and flexibility of quadratic and cubic polynomial curves.
Pin Root
When turned on, constrains the orientation of the driven root to the controls. When turned off, the spline solver determines the orientation of the root.
Pin Tip
When turned on, constrains the orientation of the driven tip to the controls. When turned off, the spline solver determines the orientation of the tip.
Add Stretch Control
When turned on, adds an abstract control at the tip control that allows you to adjust the stretch of the spline.
Note
If Use Click and Drag in the handle parameters is turned off, you need to select the abstract control first, then drag to see the effects of the stretch. If Use Click and Drag is turned on, you can click and drag the abstract control in one step.
Stretch
Specifies whether to keep the length of the spline. When set to 0, the spline keeps its length. When set to 1, the spline stretches to follow the CV.
Stretch Scale
Controls the amount of stretch. Increasing this value increases the effect of the stretch.
Squash Scale
Controls the amount of squash. Increasing this value increases the effect of the squash.
Keep Tip Scale
When turned on, the scaling at the tip of the spline remains unchanged as you stretch the spline. When turned off, the tip of the spline is scaled as you stretch the spline.
Driven ¶
Segments
Segments are tags that separate each spline chain. Tags can be set up on skeleton joints using an 
Attribute Adjust Array SOP. See preparing skeletons for rigging for more information.
If Segments is empty, the spline logic is run once.
Note
The Segments parameter does not take APEX path patterns, for example, the %tag() function. Instead, specify the tag names directly in this field.
Driven
The TransformObject nodes to drive, for example, spine_01, spine_02, spine_03. This parameter also accepts APEX path patterns, so you can specify tags in this field, for example, %tag(spline).
It is good practice to also specify the bind tags that are set up by default on the FK transform component’s Tags parameter. The FK transform component is normally the first component that is used to start building a rig. Including the bind tag helps to ensure that you don’t include other controls that might have inherited, for example, the spline tag. So for this component, you can set Driven to %tag(bind) & %tag(spline).
Driver ¶
By default, the spline component sets up a tangent spline with 4 controls - Root Name, Root CV Name, Tip CV Name, and Tip Name. The controls are created automatically using the root and tip as reference. Make sure the control names are unique and don’t conflict with any other controls. You can use the {segment} string when creating multiple splines so that there are no naming conflicts (see the Root parameter).
Custom
When turned on, creates the specified number of controls, Num Controls.
Num Controls
When Custom is turned on, this is the number of controls to create.
Root Name
When Custom is turned off, this is the name of the root control.
Root CV Name
When Custom is turned off, this is the name of the root tangent CV (control vertex).
Tip CV Name
When Custom is turned off, this is the name of the tip tangent CV.
Tip Name
When Custom is turned off, this is the name of the tip control.
Scale Inheritance
Sets the scale inheritance of the spline controls.
Promote T
When turned on, promotes the translate component of the spline controls.
Promote R
When turned on, promotes the rotate component of the spline controls.
Promote S
When turned on, promotes the scale component of the spline controls.
Root CV Offset
The offset to add to the root tangent CV.
Tip CV Offset
The offset to add to the tip tangent CV.
Parent ¶
Root
The parent of the root. If left empty, the root is parented to Root's parent. If you are setting up multiple splines, you can leave this field empty. However, you can set parent tags on the guide skeleton, and use the parent tag plus the segment tag to get the correct parent for each segment.
To unparent the root control, set this parameter to an underscore (“_”).
This parameter accepts APEX path patterns, so you can specify tags in this field, for example, %tag(<tag>).
Tip
The parent of the tip. If left empty, the tip is parented to the Root. To unparent the tip control, set this parameter to an underscore (“_”).
This parameter accepts APEX path patterns, so you can specify tags in this field.
CV
The parent of the CVs. If left empty, the CVs are parented to the closest outer control. To unparent the CV controls, set this parameter to an underscore (“_”).
This parameter accepts APEX path patterns, so you can specify tags in this field.
Tags ¶
Shape ¶
Shape
The shape of the controls. It can be set to any of the built-in APEX control shapes.
Color
The color of the control shapes. To inherit the shape color from the guide skeleton, set this value to (0, 0, 0).
Translate
The translation of the control shapes.
Rotate
The rotation of the control shapes.
Scale
The scale of the control shapes. To inherit the shape scale from the guide skeleton, set this value to (0, 0, 0).
| See also |
APEX Autorig Component