ANIM MOD TOOL [Animation Modifier: blend, mirror, reverse Animations and Mocap]

Context Menu Workflow and Asset Preparation

Working with animation assets begins directly in the content browser. Right-clicking an animation sequence opens the context menu, where selecting Modify Animation Sequences brings up the main tool interface. Because modifications write directly to the asset upon execution, duplicating animation sequences beforehand is an essential procedural safeguard. Once the tool window is open, you configure specific modifier parameters, verify the results against the integrated viewport, and select the Apply button. Closing the popup window reveals the updated animation sequences ready for playback.

Batch processing behaves selectively depending on the chosen operation. While most deep structural alterations require single-sequence adjustments, operations like Reverse Animation and Mirror Animation can execute across multiple selected assets simultaneously. This capability speeds up the initial turnaround when flipping batches of directional runs or reversing symmetric transition motions.

Live Viewport Adjustments and Frame Timing Modifiers

The interactive workflow relies heavily on the live updating viewport, which updates the character's poses before you commit changes permanently to disk. Animators can select custom preview meshes to match the exact proportions of the target character, making it straightforward to spot clipping, hyper-extension, or alignment issues while tweaking parameters.

Timing adjustments take place through dedicated frame-level modifiers rather than standard timeline stretching alone:

• Repeat Frames: Duplicates chosen frames sequentially, letting you introduce deliberate hit-stops, pauses, or exaggerated weight-holds at critical moments in an attack or landing.
• Remove Frames: Strips unnecessary poses or dead frames out of captured sequences to tighten transitions and eliminate idle drifting.
• Time Manipulation: Targets isolated sections of a motion clip to accelerate or decelerate movement curves without affecting the timing of surrounding frames.

Isolating Chains in Blend With Other

The Blend With Other modifier constructs entirely new composite motions by blending a source animation against a selected target asset. Controlling this merge requires dialing in specific interaction values across both timelines:

• Start Frame: Defines the precise frame asset where the incoming blend begins. Setting this to frame 0 starts the merge immediately at the sequence opening.
• Target Asset and Target Start Frame: Designates the secondary animation clip and sets its initial playback point, coordinating phase alignment between the two actions.
• Target Frames Num: Sets the duration of the incoming animation to be injected, adjustable up to the maximum frame length of the target.
• Start Blend Frames Num and End Blend Frames Num: Establish the lead-in and lead-out transitions, cushioning the boundary between the original motion and the combined sequence to prevent jarring pops.
• Bone Filter: Directs the operation to apply blending exclusively below or above a designated parent bone. For standard character setups, selecting spine01 or higher blends the upper body of the target animation onto the locomotion of the source asset, preserving the lower body stride while layering custom upper-body performances.
• Use Static Frame from Target: Holds a single selected frame from the target asset across the entire blend duration, locking the filtered bones into an exact pose while the remaining skeleton moves freely.
• Insert as New Frames: Splits the source animation and inserts frames from the target clip directly between them without blending data, creating composite sequence chains inside a single asset.

Blending operates with the highest degree of fidelity when both involved clips share matching frame rates, preventing interpolation jitter across dense keyframe sets.

Mirror Animation and Make Looped Adjustments

Directional adjustments depend on the Reverse Animation and Mirror Animation functions. Running Reverse Animation flips playback ordering and features a dedicated toggle to clear the root bone zero-frame offset, shifting the character's root position back to world origin at frame zero. This root repositioning prevents reversed clips from snapping wildly across the coordinate space when moving backward from their terminal translation.

The Make Looped modifier creates seamless cyclic playback by calculating transitions between the start and end of a clip. The integrated logic smooths overlapping boundary frames, features an option to append extra frames to the sequence tail for softer blends, and allows picking a parent bone to confine the looping corrections to specific skeletal hierarchies. Enabling root motion within the loop interface keeps root trajectories continuous through repeated cycles, bypassing sliding during locomotion states.

Version Capabilities and Hand Poses Blend

The tool architecture splits features across engine versions, maintaining core compatibility for Unreal Engine 5.2 through 5.5 while targeting deeper modifications in Unreal Engine 5.6 and above. Standard versions incorporate a 60-pose male and female library, alongside dedicated UE4 Mannequin hand poses, for the Hand Poses blend modifier. This system snaps pre-configured grip and relax states directly onto character hands during locomotion, action, or idle sequences.

In Unreal Engine 5.6 and later, the v3.0 release revamps the Blend UI and introduces speed adjustment, horizontal blend, automatic motion matching, and custom FPS baking. The Mirror Animation tool in v3.0 expands to support selective include and exclude bone chains alongside specific time interval windows, allowing artists to mirror a single arm or leg during a fraction of the sequence. Make Looped gains integrated animation trimming controls with extended smoothing parameters, while the hand pose module supports exporting, importing, and generating custom hand pose libraries. Subsequent updates in version 3.2 introduce dedicated handling for morph curves, ensuring facial blendshapes and secondary mesh deformations survive complex sequential modifications.

For projects heavily reliant on raw motion capture data, pairing these skeletal modifiers with the complementary RM Fix Tool handles stubborn root motion extraction, directional offsets, root creation, and IK bone snapping prior to frame-level sequence editing.

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