Any Mask Batch Switch

Any Mask Batch Switch merges several MASK inputs into a single mask batch and sends it to the masks output. One mask wired in, and it passes through unchanged; several wired in, and they're stacked into a batch that a single inpainting or composition path can consume at once. It's the "combine into a batch" sibling of the pack's single-select mask switch - and honestly, the batch version is the one people tend to need.

Think about how masks actually arrive in ComfyUI: one from a segmenter, one from a manual paint, one from a detection pass. Individually they're useless to a node that wants a mask batch for a whole region set. This node is the merge point.

How it works

Starts with mask_1 and grows a slot per additional mask source. A single connected input passes through as-is. With several, each mask is prepared (a 2D single mask gets a batch dimension) and concatenated along the batch axis - but only within the largest group of matching shapes. The catch is the same one as the image batch switch: masks of different resolutions aren't concatenated, they're dropped. The node takes the biggest same-size group and silently ignores the rest.

Where you'd use it

• Multiple segmentation masks into one batch for region-wise inpainting.
• Manual + automatic masks combined for a composite pass.
• Batch masking downstream where the consumer wants a stack, not a single mask.

Install

ComfyUI Manager → search "Tojioo Passthrough" → install, or:

cd ComfyUI/custom_nodes
git clone https://github.com/Tojioo/tojioo_passthrough.git

Restart ComfyUI. No models or pip dependencies - the pack is lean Python plus a bundled frontend, on the Comfy Registry under publisher tojioo.

Common issues

Resolution mismatch is the quiet killer here: feed it masks at different sizes and the node batches the largest matching group and drops the rest, with no error to tell you. If a batch comes back short, check every mask is the same resolution (or resize them upstream). One more thing to know: this merges masks into a batch - it doesn't union them into a single mask. If you want one combined mask region instead of a batch, use a Mask Composite-style node, not this one.