ComfyUI 7c59a07 ("Use comfy kitchen rope functions in ltx models", 2026-07-24)
changed the LTX positional-embedding payload from (cos, sin, split_mode) to
(rotation_matrix, split_mode), where the matrix is (B, T, heads, D, 2, 2)
holding [[cos, -sin], [sin, cos]].
rotate_overlap_freqs read pe[1] as the sin tensor — now a bool — so it raised,
and prepare_pe's bare `except: return pe` swallowed it. The Best-FaceID
reference tokens were still appended on the target's frame-0 coordinate grid
but WITHOUT the source-phase tag that marks them as a reference, so the model
read them as literal frame 0 and opened the clip on the reference image.
Anyone on ComfyUI >= 2026-07-24 saw i2v-like behaviour they couldn't bypass.
rotate_overlap_freqs now detects the layout at runtime (pe[1] is a tensor =>
legacy cos/sin; otherwise the matrix form, tokens on axis 1, frequencies on
-3) and composes the same R(angle + phase) either way. An unrecognised payload
raises instead of silently skipping the tag.
The four LTXBaseModel wrappers no longer fail silently: each reports once per
install that identity conditioning is not being applied and that a ComfyUI
update is the likely cause. A logged warning would have made this obvious.
Tests: both layouts rotate only the ref-token tail, produce identical angles,
reject unknown payloads, and the matrix form survives end-to-end through
_install_identity_overlap.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
carry_overlap_through_anchor lets a scene keep the previous scene's latent
tail for background/environment continuity even when it switches to its own
i2v anchor, instead of the current hard cut. The anchor's own leading frame
stays untouched; only the frames after it carry the old tail.
Also fixes a real gap found along the way: the mixed-anchor branch never
called _apply_configured_guides, so Best-FaceID identity_transfer could
never resolve an identity_pin on an anchor-swap scene — exactly where it's
most useful. Added a standalone lookup so it resolves there too.
Replaces the source-phase-RoPE-only approximation with a faithful native port of
ComfyUI-BFSNodes' LTX Identity Transfer (read upstream source directly): the reference
face is now injected as separate, non-rendered overlap tokens (clean timestep, RoPE
source-phase tag, trimmed before output) instead of blending into Continuity's identity-pin
keyframe, plus an optional ArcFace embedding -> IdentityProjector -> context-token channel
(identity_projector, source_id, phase_scale, id_strength, arcface_mode, debug_log). Stays
on Chain Sampler per the Studio/Sampler boundary law's guide-ops carve-out. New
identity_transfer.py module; insightface added as a soft pip dependency.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Reverts the earlier ComfyUI-BFSNodes graph-splice approach (builder.py/timeline.py/
server.py scaffolding) in favor of porting the missing piece natively: FunPack's own
guide-attention path (LTXVAddGuide.add_keyframe_index + guide_attention_entries)
already places a reference image on the frame-0 grid exactly like BFSNodes' overlap
technique, and Continuity's existing "Identity pin" already applies one reference
face to every scene. The only real gap was the LoRA's trained-time source_phase RoPE
tag, added as a tag+strip patch on FunPackLTXAVSceneChainSampler scoped to the exact
guide-entry token range (never co-active mid_scene/carry/prior-scene guides sharing
the same keyframe_idxs tensor). New "Best-FaceID compatibility" + "Source-phase id"
knobs live under Engine Settings -> Experimental, alongside every other unvalidated
technique. LoRA loading itself reuses the existing generic Models-menu lora role.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
