Bernini-R Guidance Strength Schedule

A static guidance scale asks every denoising step to be equally obedient, and video generation doesn't work that way. Early steps shape structure and motion; late steps refine detail. BerniniR_GuidanceStrengthSchedule lets you give each step its own guidance ceiling - start hot, ease off, land soft - which is the fix for the classic failure where the beginning of a clip looks great and the detail phase gets overcooked or jittery.

How it works

The node builds a per-step guidance curve as a precomputed list, then hands it to the sampler as a BERNINI_GUIDANCE object. The sampler uses each value as that step's guidance ceiling (w_max), overriding the static cfg you set on the sampler. Guidance is applied in noise-residual space, not denoised space - which is a sentence you should remember, because it's the difference between this feature working and your video coming out gray.

Three curve shapes:

• cosine (default) - a smooth start-to-end rolloff with flat holds at both ends (hold_start, hold_end).
• linear - straight line from start to end. Simple, predictable.
• piecewise - start value, then a switch at transition to a middle value, then the end. For when you want a deliberate plateau.

The inputs that matter

• steps - the curve's step count. The tooltip says it auto-resamples to match the sampler's step count if they differ, so you genuinely don't need to keep them in sync. That's a nice quality-of-life detail.
• guidance_start (7.0) - guidance at the first step.
• guidance_end (4.0) - guidance at the last step.
• curve - cosine / linear / piecewise.

The cosine-only and piecewise-only knobs sit below those:

• hold_start / hold_end - fractions of steps held flat at each end (cosine only). Default 0.05 / 0.20.
• guidance_mid / transition - middle segment value and where it kicks in (piecewise only).

Output and wiring

One output: guidance_schedule → the guidance_schedule input on BerniniR_KSampler (or the DualExpertSampler). Works alongside BerniniR_GuidanceConfig - the schedule sets how hard at each step, the config sets which guidance method.

Where people get burned

This is one of the pack's actual troubleshooting entries. If your output comes out gray, flat, or noisy, the first thing to check is that this node is wired correctly with a sane curve - guidance in noise-residual space is unforgiving of a broken schedule. A common beginner misread: treating guidance_start and guidance_end as absolute values when the sampler also has a cfg. Once the schedule is connected, it overrides static cfg, so don't set both expecting them to interact. And don't go wild with the spread - starting at 7 and ending at 4 is a gentle, effective curve; something like 12 → 0.5 is how you get oscillation. The auto-resample is there so you can tune the shape, not so you can chase the sampler's step count.