Why does my additive pose blend to a wrong baseline?

Additive type defaults to Mesh Space which breaks for character animations. Set Additive Anim Type to Local Space and Base Pose Type to Selected Animation Frame with the correct base.

What's a base pose for additive?

Reference frame to compute deltas against. Pick the rest pose at frame 0 of the same clip; add represents the difference.

Layered Blend Per Bone with additive?

Plug additive into Apply Additive node in the bone-blend chain. Order: base anim → apply additive → output.

Fix: Unreal Additive Pose Blends To Wrong Baseline

Quick answer: Anim asset → Additive Anim Type = Local Space. Base Pose Type = Selected Animation Frame. Choose base from same skeleton.

Aim offset additive overrides root motion. Character drifts. Mesh Space additive misalignment.

The Fix

AdditiveAimAnim asset:
  Additive Anim Type:           Local Space
  Base Pose Type:               Selected Animation Frame
  Base Pose Animation:          Idle.uasset frame 0

Anim Graph:
  Locomotion StateMachine
       |
       v
  Apply Additive (with AdditiveAimAnim, alpha 1)
       |
       v
  Output Pose

Local Space additive computes per-bone local deltas. Combines cleanly with base motion without overriding hips/root.

Verifying

Aim left/right: spine rotates while locomotion plays. Without Local Space: drift or root jump.

“Local Space. Base pose set. Add layers cleanly.”

Related Issues

For Anim BP cached pose, see cached pose. For Bone Control order, see bone control.

Local space. Base. Add.