Sigma Schedule Graph Node for ComfyUI & Wan‑Video

A compact, bidirectional sigma‐schedule editor for diffusion sampling.
Shape a high‑resolution schedule by defining just a handful of control points—then automatically extrapolate that curve to any number of steps without typing dozens of values or dragging dozens of handles.

Why low‑point curves matter

• Sketch your noise schedule with just a handful of points. Refine the shape quickly!
• When you bump steps up to 35, 100, or more, the node interpolates your low‑point profile into a full sigma list for your sampler.
• No need to manually adjust dozens of numbers or sliders. Design your conceptual curve once and use for any number of steps!

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Features

• 🎨 Interactive Graph
  Drag handles to shape your sigma curve.
  ➕ to add new graph point for fine tuning
  ➖ to remove one graph point.

• ✍️ Textual Workspace
  The top textarea shows your control‑point y‑values.
  Paste comma lists or full JSON point arrays.
  Textual edits auto‑sync to the graph.

• 🔄 Dynamic Extrapolation
  The bottom preview displays the final sigma list of length=steps.
  Change steps and immediately see how your low‑point curve scales.
  (obscured by default on-load for compactness)

• 💾 Save & Load Presets
  Toggle save‑mode with the 💾 button, then click a slot to store or recall curves.

• ℹ️ Built‑in Help
  Click the ℹ️ button for quick tips.

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Preview

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Installation

1. Copy the Folder
   Place this directory under:

   ComfyUI/custom_nodes/TWanSigmaGraph/

2. Restart ComfyUI
   Relaunch the server or reload your browser.

3. Locate the Node
   Find Sigma Schedule Graph under sampling → custom.

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Usage

1. Set Steps
   Adjust the steps input—this defines how many sigma values you’ll get.

2. Design Your Curve
   • Edit the top text box or drag points on the graph.
   • The graph and text box stay in sync.

3. Adjust Density (Optional)
   Click + / – to add or remove handles for finer or coarser control.

4. View Final Sigmas (Optional)
   Expand the node to see the full sigma list interpolated to steps.

5. Save Presets
   • Click 💾 to enter save mode.
   • Click a slot to store or load a curve.

6. Info & Reset
   Use the ℹ️ popup for instructions.
   To reset, clear the node’s cache in your browser’s localStorage.

7. Connect to Sampler
   Plug the SIGMAS output into any sampler that accepts custom sigma schedules (e.g. KSampler).

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File Structure

TWanSigmaGraph/
├── __init__.py                 # Node registration & widget directory
├── TWanSigmaGraph.py           # Backend: parse & interpolate points
└── js/
    └── TWanSigmaGraphWidget.js # Frontend: graph UI, text sync, presets

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Troubleshooting

• Blank Widget on First Load
  Refresh the page—this alpha‑stage bug will be fixed soon.

• Presets Not Saving
  Check that localStorage is enabled for 127.0.0.1 in your browser.

• Curve Reverts to Default
  The node defaults to four points (1.00, 0.67, 0.33, 0.00). To clear your custom curve, delete the key TWanSigmaGraph_last_<node.id> in dev‑tools → Application → localStorage.

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Thanks & Credits

• Realistic_Studio_930 — Curve design inspiration
• huchenlei — JavaScript guidance
• ComfyUI Community — Testing & feedback

Licensed under the MIT License. See LICENSE.txt for details.