⬡ Polyhedron Noise Schedule [deprecated]

Deprecated. That's the first word the node itself wants you to know, and it's worth respecting: this is the original sigma-curve node from this pack, kept around purely so old saved workflows don't break when the pack updates. New work should use its successor, ULSUniversalSigmaCurve, which is the same idea generalized past the Wan-only naming. But if you've got a workflow from six months ago that loads it, you need to know what it does and why it's still here.

Functionally it's a single-schedule sigma generator. You pick a curve shape, a step count, and the noise range, and it emits a sigmas curve. What distinguishes this older node is the output pins: alongside sigmas it also hands out steps, sigma_max, sigma_min, and rho as INT/FLOAT values, and the original pitch was that those numbers render inline next to widgets - wire them into samplers and schedulers for "instant sync". That pass-through trick is the ancestor of the newer curve node's steps output, and it's the one genuinely nice idea worth stealing even now.

The required inputs are sigma_schedule, steps, sigma_max, sigma_min, and rho. The "Wan" in the name comes from the defaults the old node was born for - sigma_max 1.0 and sigma_min 0.002 are the flow-matching values Wan needs, which is also why the successor calls itself universal: same numbers, but it spells out that SDXL/SD1.5 want 14.61 and 0.029 instead of leaving you to figure that out from context. rho is the shape parameter, and it only bites for the karras/exponential/laplace curves.

Installing it

It ships in the Polyhedron Suite pack like everything else here:

cd ComfyUI/custom_nodes
git clone https://github.com/PolyhedronAI/ComfyUI-PolyhedronLoRAStack.git
# restart ComfyUI

Or ComfyUI Manager, search "Polyhedron Suite". No dependencies beyond ComfyUI core.

The honest advice: don't build anything new on it. It still works, it's not broken, and that's exactly why it's kept - but the successor is a drop-in replacement that documents the model-family switch instead of burying it in a name. If you're starting fresh, reach for ULSUniversalSigmaCurve and let this node retire in peace inside your old workflow files.