Three things that were each locked to one implementation detail:
- steps + schedule were a KSampler-branch feature, though every sampler here
walks a sigma list handed in from outside. They are now pass-level, so
Distilled Flow and Hybrid Euler 2S can run a named schedule (and the second
pass can be computed rather than typed) in both frontends and on the node.
- the project's Frames field snapped to the model's grid on every family. On
H3 that is required, but its arrows moved by 1 and the snap put the value
straight back; on LTX the builder rounds up by itself, so the snap only
fought the user. H3 now steps a whole 17 frames per arrow, LTX keeps what
you type and walks 8k+1 with its arrows.
- ALG lived inside the Distilled Flow step loop, so it was unreachable with a
stock KSampler. Its blurred/sharp swap is decided by the step's sigma, and
sigma is an argument of every model call, so a denoiser proxy drives it from
outside any sampler. New alg_anchor toggle on the Chain Sampler drives the
in-loop version too, so there is one control wherever you are.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
alg_blur_guides no longer borrows the sampler's anchor knobs: the Scene Chain
Sampler gains alg_guide_blur_strength (default 2.0) and
alg_guide_blur_sigma_threshold (default 0.975), threaded per-chunk via
extra_options like the tail count. The sampler now precomputes one latent per
(anchor blurred?, tail blurred?) combination — the frame sets are disjoint, so
the both-blurred variant composes the two passes — and each region follows its
own sigma window per step. Anchor ALG (alg_enabled/alg_strength/
alg_sigma_threshold) is untouched and back to anchor-only semantics.
Editor: 'Guide blur strength' and 'Guide blur sigma threshold' rows appear
under Engine ▸ Experimental when the blur toggle is on (sampler_inputs bridge,
names match the new node widgets; inputs appended at the block end to keep the
builder's positional widget mapping aligned).
Verified live: object_info shows both widgets appended last; Editor rows
appear on toggle and persist to project.sampler_inputs. 11 ALG unit tests
pass (new: composed independent-strength blur); same 20 pre-existing suite
failures.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Generalizes the i2v-anchor blur (_alg_blur_video_frame0 -> _alg_blur_frames)
to optionally also blur newly-appended guide-attention frames each scene
(mid_scene_guide / carry_i2v_guides-as-guide / configured guides / JoyAI
memory), reusing the existing guide_tail bookkeeping rather than a mask-value
heuristic (frame_overlap continuation also uses mask=0 and must stay
untouched). New Scene Chain Sampler toggle "Blur i2v guides and JoyAI memory"
mutates the shared KSAMPLER's extra_options per-chunk since guide_tail varies
per scene; always resets so nothing leaks across chunks/samplers. Surfaced in
Engine Settings via the existing Experimental section, no backend/builder
changes needed beyond the new INPUT_TYPES field.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adaptive Low-Pass Guidance (arXiv:2506.08456): blurs the i2v anchor frame
while sigma is in the near-pure-noise region, then swaps back to the sharp
anchor, to stop the model shortcutting to a near-static video that just
matches the reference image. Opt-in, off by default, no-op without an i2v
anchor. Swaps model.latent_image per step (the same attribute ComfyUI's
inpaint compositing already re-pastes every step) instead of monkeypatching
comfy internals.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
