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Sigma Graph Node for ComfyUI

A compact, bidirectional editor for sigma schedules in diffusion sampling.

• 📈 Drag points on a graph to shape the schedule
• ✍️ Edit sigma values in text form (auto-synced)
• 🔁 Click ▼ to apply text changes to the graph
• 💾 Save/load custom curve presets

Installation

1. Copy this folder to: ComfyUI/custom_nodes/sigma_graph
2. Restart ComfyUI
3. Look for SigmaGraphNode under sampling → custom

How to Use

1. Set your desired steps
2. Use the graph or text box to shape the sigma curve
3. Connect the output (SIGMAS) to a sampler that supports external schedules (e.g., KSampler)
4. (Optional) Use the 💾 button to toggle save mode and store/load your favorite curves

Thanks

• Special thanks to Realistic_Studio_930 for introducing me to sigma schedules and inspiring the graph.
• Special thanks as well to huchenlei for graciously helping review and guide the js portion of this code
• Special thanks to Google and OpenAI - Gemini 2.5 Pro and ChatGPT o1/o3-mini(high) were utilized during this project

File Overview

File	Purpose
__init__.py	Registers the node and loads the front-end widget
SigmaGraphNode.py	Backend logic: interpolates a sigma tensor schedule
js/SigmaGraphWidget.js	Custom graph widget UI (drag, sync, presets)

Screenshots