🔰 Mirror (jov)

Mirror (jov) 🔰 flipped an image across the X axis, the Y axis, or both - and, unusually, let you pick where the mirror line sits. Instead of always reflecting around the image center, you could set the pivot to 25% or 75% and get an off-center reflection, which is the trick behind seamless mirrored textures and kaleidoscope-ish composition. It's a small node with one genuinely nice idea.

The lowercase "(jov)" tells you it's old, and yes - it's another pre-2.0 node that didn't keep its name. In current Jovimetrix, mirroring lives inside TRANSFORM (JOV) 🏝️, which is the pack's general geometric node: translate, rotate, scale, mirror, tile, and perspective, with a mirror mode selector and a pivot control for exactly this purpose. The README's 1.7.48 warning applies here like everywhere else - update past it and "Mirror (jov)" stops loading.

How it worked

The inputs were minimal and precise:

• pixels - the image to mirror (required).
• x / y - the mirror pivot as fractions, default 0.5/0.5 (the center). 0 = left/top edge, 1 = right/bottom edge.
• mode - which axis to reflect around (X, Y, or both).
• invert - a small extra that flipped the result's polarity.

Outputs: image and mask - the mirrored result and its alpha.

The mechanism is a simple geometric reflection, but the pivot is the whole game. Mirror around the vertical center and a left-facing subject turns right; mirror around an edge and you build a continuous, seamless reflection - set x to 1.0 and your image reflects as if there's a mirror at its right edge, which is exactly the primitive you need for tiling textures that fold back on themselves.

Installing it

It ships in Jovimetrix:

# ComfyUI Manager: search "Jovimetrix" and install
cd ComfyUI/custom_nodes
git clone https://github.com/Amorano/Jovimetrix.git
cd Jovimetrix
pip install -r requirements.txt

Restart ComfyUI. Updating past 1.7.48 removes the legacy name; staying on it keeps it.

Troubleshooting

• Node missing after an update - expected. Use TRANSFORM (JOV) 🏝️, set the MIRROR mode and PIVOT, done.
• The reflection isn't where you expect - recheck your pivot. x/y are fractions of the image, and 0.5/0.5 is center. Most "why is my mirror off-center" reports are just a pivot that got dragged off 0.5.
• Mirroring both axes just looks like a rotation - yes, reflect-X then reflect-Y around the same pivot equals a 180° turn. That's mathematically correct, just usually not what you wanted; pick one axis.

Mirror is a one-trick node, but the trick (pivotable reflection) is still alive and well inside TRANSFORM. If an old workflow references it, the port is a two-minute job: swap the node, set mirror mode + pivot.