Mirror transform (one time)

OneTimeMirrorTransform is the one-shot version of Mirror transform: it flips or rotates the denoised prediction exactly once, at exactly one step, and then the sampler carries on. It's the dramatic member of the pack's one-time family - a single mirror or rotation mid-sampling is a visible event, not a nudge.

The inputs

• step - the step to fire on (1-based).
• direction - vertically, horizontally, both, 90 degree rotation, or 180 degree rotation. Same five choices as the full Mirror transform, including the two rotations.
• mode - replace flips outright; combine averages the flipped and original latent, producing a ghosted symmetry instead of a hard flip.

Output is a TRANSFORM for a TSampler, TSampler Advanced, or Transform Hijack-patched sampler.

Why you'd use it

A one-time mirror is the cleanest way to get a symmetric result without a visible seam - because the sampler doesn't just present you a flipped image, it rebuilds on top of the flip. Flip at step 4 of 20 and the remaining 16 steps draw both halves in, smoothing the seam into an intentional symmetric composition. The classic use is portrait/logo symmetry: mirror once early, let the model finish the mirrored half.

The rotations are where this node surprises. A single 180-degree rotation with combine mode is the cheapest four-way-ish kaleidoscope trick in ComfyUI - rotate once, average, and the sampler resolves the mess into something resembling rotational symmetry. It's not clean symmetry, it's mood symmetry, and people use it for ornamental and heraldic-looking outputs.

The honest trade-off

One mirror is a bigger visible event than one shift or one multiply, so it's less of a subtle tool - but it's also the best one-time node for learning, because you can't miss whether it fired. The main pitfall is combine mode plus an early flip: the ghosting gets folded into the rest of the generation and can look like motion blur. Start with replace mode and a flip at roughly step 1/4 of your run.

Install

Same pack, same routine:

cd ComfyUI/custom_nodes
git clone https://github.com/RomanKuschanow/ComfyUI-Advanced-Latent-Control

Restart, or install "Advanced Latent Control" via ComfyUI Manager. No models, no extra dependencies.

The bottom line

If you want symmetry, don't flip the finished image - flip once mid-run and let the sampler do the rest. That single-sentence workflow is the entire reason this node exists, and it's one of the pack's most satisfying results per click.