ComfyUI's args["cond"]/["uncond"] are (x - denoised), which are
sigma-scaled. At late denoising steps (sigma~0.01), the fixed K=0.2
correction was 200x the signal magnitude, destroying the image.
Fix: compute SMC in denoised space using args["cond_denoised"] and
args["uncond_denoised"], which have consistent magnitude across all
sigma values — matching the paper's noise-prediction space.
Also fixes first-step behavior to match the original paper (SMC
correction applied from step 0, not step 1).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements the Sliding Mode Control CFG algorithm from the paper
"CFG-Ctrl: A Control-Theoretic Perspective on Classifier-Free Guidance" (CVPR 2026)
as a ComfyUI model patch node.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
