Clip Mixer

Overview

Combines two animation clips into one. Separately recorded clips, such as a basic body motion and an additional arm-only motion, can be layered and passed downstream as a single clip.

Usage tips

• a is the base and b is the override. For tracks targeting the same item, b wins, making this useful for a base motion with selected parts replaced.
• This is convenient for producing motion variants. Reuse the base clip and replace only b to batch-produce combinations such as "walk + wave" and "walk + attack."
• Send the mixed result directly to clip_apply_path / clip_apply_image.

Common pitfalls

• Expecting the two motions to be blended: mixing means replacement, not interpolation. If both clips move the same point, only the motion from b remains.

Related nodes

• keyframe_clip — create the source clips
• clip_loop_fit — adjust the loop after mixing
• clip_apply_path / clip_apply_image — apply the mixed result

Technical details

When both clips contain a track with the same id, the track from b takes priority. The merge is implemented internally by bridging to RecordedLayer first.

Examples

• Use it to combine a base motion and an overlay motion into one clip.

ID collisions and time

• Replacement is based on the exact track ID stored in JSON, not a display name or a guess that two tracks target the same object. b replaces a only for the same ID; different IDs are both retained.
• Output duration is the larger duration of a and b.
• The only evaluation input is progress (normalized 0–1); the legacy absolute-seconds time pin has been removed. Connect Time Source to progress.