Observe Bone

Describes how you can debug a specified Bone with the Observe Bone node.

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With the Observe Bone Animation Blueprint node, you can watch a selected bone's translation rotation and scale motion for debug purposes.

observe bone animation blueprint node

Here a character's upperarm_l is being observed during an animation.

observe bone animation blueprint node demonstration

The node will display debug data in the AnimGraph with the coordinates of the Bone to Observe's motion. Each line of the debug data displays an element of motion data on each axis.

For example:

  • TX represents Translation on the X axis.

  • RY represents Rotation on the Y axis.

  • SZ represents Scale on the Z axis.

Property Reference

Here you can reference the Observe Bone properties accessible in the node's Details panel.

Property

Description

Bone to Observe

Here you can define a bone from the character's skeleton to track position and motion data.

Display Space

Here you can select what space the Bone to Observe motion is calculated.

  • World Space: observes the absolute position of the Bone to Observe in world space.

  • Component Space: observes the position of the Bone to Observe within the Skeletal Mesh's reference frame.

  • Parent Bone Space: observes the position of the Bone to Observe relative to the parent bone.

  • Bone Space: observes the position of the Bone to Observe within its own reference frame.

Relative to Ref Pose

When enabled this property will track the position and motion data of the Bone to Observe relevant to the Skeletal Mesh's reference pose, based on the space defined in the Display Space property.