3. Restart or start ComfyUI.
4. Look under Nodes → sampling → custom in ComfyUI’s UI. The SigmaGraphNode should appear.

Usage

1. Add the Sigma Graph Node to your ComfyUI workflow.
2. Connect its output (SIGMAS) to a sampler that accepts custom sigmas (for example, a KSampler node set to external sigmas).
3. Adjust the steps parameter.
4. Drag points on the graph or edit the sigma values in the text box (comma-separated).

• Click the ▼ button to apply text changes to the graph.
• The node automatically recalculates your schedule after each drag or text edit.

5. (Optional) Use the presets to save and load different graph shapes.

File Overview

• __init__.py
  Ties this folder into ComfyUI’s extension system. Sets the WEB_DIRECTORY to the js subfolder so ComfyUI can serve SigmaGraphWidget.js.

• SigmaGraphNode.py
  Defines the custom node class. Handles:

• Input parameters: steps (int) and graph_data (JSON string).

• Conversion of graph points into a PyTorch tensor of sigmas.

• The final reversed schedule (since many ComfyUI samplers read sigmas in that order).

• SigmaGraphWidget.js
  JavaScript front-end controlling the interactive graph and the bidirectional text input. It:

• Registers a custom DOM widget type ("sigma_graph").

• Draws a canvas for the curve, with points you can drag, double-click, or remove by right-click.

• Syncs changes to the node’s internal JSON string value (graph_data).

• Updates a live text preview of the sigma schedule and can parse new sigma values from the text.

Contributing

Feel free to open issues or pull requests if you have improvements or bug fixes!

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Happy sampling! Enjoy your interactive sigma graph editor.