🔄 Auto Switch

Auto Switch is the "whichever one has a value, use that" node. It has several input slots and a single output, and it passes through the first input that's actually present - no manual selector, no boolean to flip. That's the "auto" part. Compared to the pack's regular Switch or Logic Switch, where you pick or a condition picks, this one just takes the first slot that isn't empty and forwards it.

It's built for optional branches. Say your graph has an optional img2img input: if an image is wired in, use it; if not, fall through to the next source. Auto Switch handles that fallthrough cleanly instead of you rewiring the graph depending on the case. The pack groups it with the other flow-switching nodes for "automating workflows," and this is the most hands-off of the bunch.

How it works

It checks the inputs in order - input1, then input2, and so on - and outputs the first one that has a value (isn't None/unconnected). Everything after the first hit is ignored. So the slot order is really a priority order: slot 1 wins if it's present, otherwise slot 2, and down the line.

The inputs and outputs that matter

• input1-input6 (all optional, any type) - your candidate sources, in priority order. Wire in as many as the situation needs.

The single output is output - the first connected input, passed through at its own type.

How to install it

Comes with the SDVN pack. ComfyUI Manager, search SDVN_Comfy_node; or:

cd ComfyUI/custom_nodes
git clone https://github.com/StableDiffusionVN/SDVN_Comfy_node
pip install -r custom_nodes/SDVN_Comfy_node/requirements.txt

from the ComfyUI root, then restart. No models, no dependencies.

Common issues & troubleshooting

Order is priority. If two inputs are connected, the lower-numbered slot wins and the other is dropped. If it's forwarding the "wrong" one, check which slot each source is plugged into - rearrange so your preferred source sits in an earlier slot.

Nothing came through. If every slot is empty/unconnected, there's nothing to pass. Make sure at least one candidate actually carries a value.

"Present" vs "empty." The selection is about whether a slot has a value at all. An input that's connected but carrying an empty or zero value still counts as present - this isn't a "skip falsy things" node. If you need logic based on the content of a value (is it greater than X, does it contain Y), that's the pack's Boolean plus Logic Switch, not Auto Switch.

You wanted a manual pick. If the whole point is that you choose which branch runs by hand, use the plain Switch instead. Auto Switch deliberately takes the choice out of your hands.