Procedural modules

Arm

FK/IK arm with deformation options and mirroring.

BipedFK / IKL / R

Arm builds an arm from shoulder to wrist in FK, IK, or both modes, with deformation options and left/right mirroring.

Configuration

In Module Manager, choose Arm in Module Bank, or its instance in Scene Modules.

Arm · CONFIGURATION · Poseidon theme.

Reference	Purpose
1 · Side & Mirror	Choose the source side, L or R. Mirror, enabled by default, builds both sides.
2 · Colors	Main Color regenerates the source-side palette; Output Color sets the deformation joint color.
3 · Topology	Enable FK, IK, or both. At least one branch must remain active.
4 · IK Options	Adds IK Offset, Twist, Stretch and Soft IK. These options require the IK branch.
5 · Helpers	Shoulder Unroll and Wrist Twist each add one deformation output and joint per side.
6 · Design	SHAPE and COLOR set the appearance of FK Chain, IK Targets, Pole Vector, Blend and Options.

All options are enabled by default. On an existing instance, configuration changes require Rebuild; shapes and colors apply immediately.

The three placers form the Shoulder → Elbow → Wrist chain. Their scale is locked.

Placer	Role
Shoulder	Shoulder position and orientation: free translation and rotation.
Elbow	Upper-arm length and rest bend: Translate Y and Rotate X only.
Wrist	Forearm length and wrist orientation: Translate Y and all three rotations.

Pole Vector and Blend also have editable placement parents in the Outliner to adjust their rest position.

Controller	Role
FK Chain	Three chained controls: Shoulder, Elbow, Wrist.
IK	Wrist position and orientation target.
IK Offset	Additional adjustment under IK; hidden by default.
Pole Vector	Orients the elbow bend plane through translation.
Blend	Hosts FK / IK when both branches exist. Binary selection, default FK.
Options	Helper weights and IK Offset visibility.

To change modes while preserving the pose, use Switch FK/IK. The FK / IK selector alone does not match the controls.

Module Preview

Arm · Module Preview · Poseidon theme.

On the IK control, depending on enabled options. IK Offset exposes the same settings.

Setting	Effect
Twist	Rotates the arm’s bend plane. Default: 0°.
Stretch	Blends extension towards the target, from 0 to 1. Default: 1.
Soft IK	Softens the approach to full extension, from 0 to 2. Default: 0, with no softening.
Elbow Adjust	Redistributes length between upper arm and forearm without changing their sum. 0 is neutral; a positive value lengthens the upper arm and shortens the forearm.

In the Options control’s Channel Box. Module Manager switches add the helpers; the values below control their effect.

Setting	Effect
Shoulder Unroll	Blends shoulder twist compensation on the helper, from 0 to 1. Default: 1.
Wrist Twist	Blends the wrist’s twist into the helper, from 0 to 1. Default: 1.
Show IK Offset	Shows IK Offset curves; hiding them does not disable its effect. Off by default.

These settings appear when their corresponding option is built.

Each built side has its own ports. base and the three main outputs expose driver and reference; the two helpers expose driver only.

Direction	Port	Role
Input	`base`	Incoming motion for the arm, including IK and Pole Vector controls.
Output	`shoulder`	Shoulder result in the active mode.
Output	`elbow`	Elbow result in the active mode.
Output	`wrist`	Wrist result in the active mode; connection point for the hand.
Output	`shoulder_unroll`	Optional shoulder twist compensation helper.
Output	`wrist_twist`	Optional wrist twist helper.

Each output drives its deformation joint: 3 joints per side, or 5 with both helpers. Rebuild blocks removal of a helper that still has consumers.