NIX_XYGridMapper

NIX_XYGridMapper is a grid-search helper. It takes an index - the kind of thing a counter or loop emits - and maps it to a coordinate in a two-dimensional grid: one value from an X sequence, one from a Y sequence. Feed it a sequence of indexes 1, 2, 3... and you get a sweep across both axes, which is how you test "what happens as I raise both the LoRA weight and the CFG" without building 25 manual branches.

It's part of the NIX pack - small, dependency-light (numpy + Pillow), no models. One install gets you this and the rest of the pack's utilities.

How it works

You define two sequences with three numbers each:

• x_min, x_max, x_step - the X axis, a float range. Defaults 0.1 → 1.0 in 0.1 steps.
• y_min, y_max, y_step - the Y axis, a float range. Defaults 0.1 → 1.0 in 0.1 steps.
• index (INT, min 1, max 2000) - the counter.

The node builds the full list of X values and Y values, then treats index as a row-major pointer: x_index = (index - 1) % len(x_values) and y_index = (index - 1) // len(x_values). So index 1 gives the first X and first Y, and as the index climbs you move across X, then wrap to the next Y row.

Outputs:

• x_value (FLOAT) - the X at that position.
• y_value (INT) - the Y at that position, truncated to an integer.
• name (STRING) - "y_x" with dots stripped, e.g. "1_05" for y=1, x=0.5. Handy for filenames.

The name generation and the y-to-int truncation are the two quirks to remember.

Where it slots in

This is the ComfyUI cousin of A1111's X/Y plot. Drive index from a loop or counter, wire x_value into one parameter (LoRA weight, CFG, denoise strength) and y_value into another (steps, seed, batch size), and run a batch to produce a grid of variations. The name output lets you save each result as something readable instead of 00042.png.

Use X for continuous float parameters and Y for integer-flavored ones - that's clearly what the node's types expect, and it spares you the surprise of a truncating Y. If you need two float axes, you'll want a different mapper or to cast.

Getting it installed

• ComfyUI Manager: search "NIX" / "NIX ComfyUI Plugin", or Install Custom Nodes → Git URL → https://github.com/J-ChenX/ComfyUI-NIX. Restart after.
• By hand:

  cd ComfyUI/custom_nodes
  git clone https://github.com/J-ChenX/ComfyUI-NIX
  

  Restart ComfyUI. Under the "NIX" category.

Things that will bite you

• y_value is INT. Your Y sequence of 0.1, 0.2, 0.3 becomes 0, 0, 0. If that's not what you meant, sweep the float axis with X.
• Out-of-range index returns the first element, silently. Index 0 or 2001 won't error - it'll just hand back the grid's start. Design your loop bounds accordingly.
• Max index is 2000, so a big grid caps at 2000 combos (say, 50×40).
• Name strips dots but not minus signs - negative values produce names like -05 which can be awkward in filenames.
• Quiet pack. No community footprint for NIX as of mid-2026, so no copied grid workflows; the mapping math is a short readable block in the source if you want the exact row-major order.