The Handle Component is a new IK tool designed for manipulating groups of bones. Whereas the previous IK tools only allowed for a single end-affector per bone chain, this new method allows for several end-affectors per bone. Furthermore, the bones need not be a chain. Any setup, including branches, are handled.
One typical example is the use of motion capture data. In higher-end systems, you could have a cloud of marker positions and a skeleton to be driven by it.
This Handle Component works in tandem with the Handle CHOP. The following setup is commonly used: Given a hierarchy of bones, attach one or more Handle Components to specific locations on each Bone Component. Assign each handle a target in space to follow. Create a Handle CHOP which collects this information and calculates the rotation channels for the bones. Export these values back to the bones.
Parameters - Handle Page
target - Where the Handle will pull the bone towards (like an end-affector).
t - ⊞ - Displacement tx,ty,tz relative to the origin of the bone where the handle is anchored.
weight - When multiple handles are attached to a bone, higher weighted handles draw closer to their target.
twistonly - When enabled the handle only contributes the the z rotation of the bone, when disabled it points the bone (rx, ry, and rz).
falloff - This value affects how much parent bones are affected when the child bone is reaching a target. It affects the flexibility of the chain.
Rotation Limits X
dorxlimit - These affects how much the bone is allowed to rotate with respect to its parent.
lrx - ⊞ -
Rotation Limits Y
dorylimit - These affects how much the bone is allowed to rotate with respect to its parent.
lry - ⊞ -
Rotation Limits Z
dorzlimit - These affects how much the bone is allowed to rotate with respect to its parent.
lrz - ⊞ -
Parameters - Render Page
material - Selects a MAT to apply to the geometry inside.
drawpriority - Determines the order in which the Components are drawn. Smaller values get drawn after (on top of) larger values.
pickpriority - When using a Render Pick CHOP or a Render Pick DAT, there is an option to have a 'Search Area'. If multiple objects are found within the search area, the pick priority can be used to select one object over another. A higher value will get picked over a lower value. This does not affect draw order, or objects that are drawn over each other on the same pixel. Only one will be visible for a pick per pixel.
wcolor - ⊞ - Use the R, G, and B fields to set the Component's color when displayed in wireframe shading mode.
lightmask - By default all lights used in the Render TOP will affect geometry renderer. This parmaeter can be used to specify a sub-set of lights to be used for this particular geometry. The lights must be listed in the Render TOP as well as this parameter to be used.
Parameters - Extensions Page
The Extensions parameter page sets the component's python extensions. Please see extensions for more information.
reinitextensions - Recompile all extension objects. Normally extension objects are compiled only when they are referenced and their definitions have changed.
Extension Object 1
extension1 - A number of class instances that can be attached to the component.
Extension Name 1
extname1 - Optional name to search by, instead of the instance class name.
Promote Extension 1
promoteextension1 - Controls whether or not the extensions are visible directly at the component level, or must be accessed through the
.ext member. Example:
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Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.
An Operator Family that associates a shader with a SOP or Geometry Object for rendering textured and lit objects.
Any component can be extended with its own Python classes which contain python functions and data.