Add detailed README with SVG diagrams and Apache 2.0 license

Includes algorithm comparison, node wiring, and parameter guide
diagrams. SVGs use <picture> tags for GitHub compatibility.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

LICENSE

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+   Copyright 2025 Hang Yang, Shuwei Shi, Changhao Nan, Jingyi Yu, Lan Xu
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README.md

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+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/banner.svg">
+  <source media="(prefers-color-scheme: light)" srcset="assets/banner.svg">
+  <img alt="SMC-CFG Ctrl — Sliding Mode Control for Classifier-Free Guidance" src="assets/banner.svg" width="100%">
+</picture>
+
+A ComfyUI node implementing **SMC-CFG** (Sliding Mode Control CFG) from the paper:
+
+> **CFG-Ctrl: A Control-Theoretic Perspective on Classifier-Free Guidance**
+> Hang Yang, Shuwei Shi, Changhao Nan, Jingyi Yu, Lan Xu — *CVPR 2026*
+> [[Paper]](https://github.com/hanyang-21/CFG-Ctrl) [[Original Code]](https://github.com/hanyang-21/CFG-Ctrl)
+
+Standard CFG uses a fixed linear gain that becomes unstable at high guidance scales — causing oversaturation, artifacts, and semantic drift. This node replaces that linear controller with a **nonlinear sliding mode controller** that keeps guidance stable at any CFG scale.
+
+---
+
+## How It Works
+
+The paper reframes CFG as a control problem. Standard CFG is P-control (proportional control with fixed gain). SMC-CFG adds a bounded nonlinear correction that enforces convergence along an exponential sliding surface.
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/algorithm.svg">
+  <source media="(prefers-color-scheme: light)" srcset="assets/algorithm.svg">
+  <img alt="Algorithm comparison: Standard CFG vs SMC-CFG" src="assets/algorithm.svg" width="100%">
+</picture>
+
+### The math in brief
+
+At each denoising step *t*:
+
+```
+e_t  = noise_cond - noise_uncond          # guidance error signal
+s_t  = (e_t - e_{t-1}) + λ · e_{t-1}     # sliding surface
+u_sw = -K · sign(s_t)                     # switching control (bounded)
+e_corrected = e_t + u_sw                  # corrected guidance
+v_out = v_uncond + w · e_corrected        # final guided prediction
+```
+
+The correction `u_sw` is bounded to `[-K, +K]` per element — this is what prevents the unbounded growth that plagues standard CFG. The sliding surface combines the error derivative with a decayed previous error, creating a feedback loop with Lyapunov-stable convergence.
+
+---
+
+## Installation
+
+### Manual
+
+Clone into your ComfyUI `custom_nodes` directory:
+
+```bash
+cd ComfyUI/custom_nodes
+git clone https://github.com/ethanfel/ComfyUI-CFG-CTRL.git
+```
+
+Restart ComfyUI. No additional dependencies required — the node only uses PyTorch (already in ComfyUI).
+
+---
+
+## Usage
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/node-wiring.svg">
+  <source media="(prefers-color-scheme: light)" srcset="assets/node-wiring.svg">
+  <img alt="Node wiring diagram" src="assets/node-wiring.svg" width="100%">
+</picture>
+
+1. Add the **SMC-CFG Ctrl** node (found in `sampling/custom_sampling`)
+2. Connect your model loader's `MODEL` output to the node's `model` input
+3. Connect the node's `MODEL` output to your KSampler's `model` input
+4. Set your KSampler's CFG scale — you can push it **higher than usual** thanks to the SMC stabilization
+
+That's it. The node patches the model's internal CFG function. It works with **KSampler**, **KSampler Advanced**, and any sampler that respects the model's CFG configuration.
+
+---
+
+## Parameters
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/parameters.svg">
+  <source media="(prefers-color-scheme: light)" srcset="assets/parameters.svg">
+  <img alt="Parameter guide" src="assets/parameters.svg" width="100%">
+</picture>
+
+### `smc_cfg_lambda` — Sliding Surface Coefficient
+**Default: `5.0`** | Range: `0.0 – 50.0`
+
+Controls the sliding surface equation `s_t = (e_t - e_{t-1}) + λ · e_{t-1}`. Higher values weight the previous error magnitude more heavily, making the controller more aggressive about correcting accumulated guidance drift.
+
+| Value | Behavior |
+|-------|----------|
+| `0.0` | Surface uses only error derivative — very gentle |
+| `1.0 – 5.0` | Balanced correction (recommended range) |
+| `> 10.0` | Aggressive — may over-constrain the generation |
+
+### `smc_cfg_K` — Switching Gain
+**Default: `0.2`** | Range: `0.0 – 5.0`
+
+Bounds the correction to `[-K, +K]` per tensor element. This is the "safety clamp" that prevents instability. Think of it as how hard the controller can push back.
+
+| Value | Behavior |
+|-------|----------|
+| `0.0` | No correction — equivalent to standard CFG |
+| `0.1 – 0.3` | Subtle stabilization (recommended) |
+| `> 0.5` | Strong correction — may introduce chattering artifacts |
+
+### `warmup_steps` — No-Guidance Warmup
+**Default: `0`** | Range: `0 – 100`
+
+Number of initial denoising steps where guidance is completely disabled (pure conditional prediction). The model establishes rough composition and structure before the SMC controller begins steering.
+
+| Value | Behavior |
+|-------|----------|
+| `0` | SMC-CFG active from the first step |
+| `2 – 5` | Lets structure form first — can improve diversity |
+| `> 10` | Long warmup — useful for experimentation |
+
+### Quick Start Settings
+
+For most models, start with the defaults and only adjust if needed:
+
+```
+smc_cfg_lambda = 5.0
+smc_cfg_K      = 0.2
+warmup_steps   = 0
+```
+
+These match the paper's recommended values and work well across SD 1.5, SDXL, SD3, FLUX, and Wan models.
+
+---
+
+## Compatibility
+
+- Works with any model that uses CFG (SD 1.5, SDXL, SD3, FLUX, Wan, etc.)
+- Compatible with **KSampler**, **KSampler Advanced**, and custom sampling workflows
+- Stacks with `sampler_post_cfg_function` nodes (e.g., RescaleCFG can be used alongside)
+- **Note:** Replaces the model's CFG function — only one `sampler_cfg_function` node can be active at a time. If another node also sets a custom CFG function, the last one in the chain wins.
+
+---
+
+## Technical Details
+
+### How it integrates with ComfyUI
+
+The node uses `model.clone()` + `set_model_sampler_cfg_function()` — the standard model patching pattern. It intercepts the CFG combination step without modifying model weights, conditioning, or the sampling loop itself.
+
+### State management
+
+The SMC algorithm requires memory of the previous step's guidance error (`e_{t-1}`). This state is held in a closure and automatically resets when a new generation starts (detected via sigma schedule discontinuity).
+
+### Performance
+
+The correction adds only lightweight tensor operations (`sign`, multiply, add) per denoising step. The overhead is negligible compared to the model forward pass. However, `disable_cfg1_optimization=True` is set to ensure both conditional and unconditional predictions are always computed.
+
+---
+
+## Citation
+
+If you use this in your work, please cite the original paper:
+
+```bibtex
+@article{yang2025cfg,
+  title={CFG-Ctrl: A Control-Theoretic Perspective on Classifier-Free Guidance},
+  author={Yang, Hang and Shi, Shuwei and Nan, Changhao and Yu, Jingyi and Xu, Lan},
+  journal={arXiv preprint arXiv:2505.18727},
+  year={2025}
+}
+```
+
+---
+
+## License
+
+This ComfyUI node is released under the [Apache 2.0 License](LICENSE), matching the original CFG-Ctrl repository.

assets/algorithm.svg

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+  <rect width="880" height="520" rx="12" fill="url(#abg)"/>
+
+  <!-- Title -->
+  <text x="440" y="38" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="20" font-weight="700" fill="#e6edf3" text-anchor="middle">Algorithm: Standard CFG vs SMC-CFG</text>
+
+  <!-- Left: Standard CFG -->
+  <rect x="30" y="60" width="390" height="430" rx="10" fill="#1c2333" stroke="#30363d" stroke-width="1.5"/>
+  <text x="225" y="90" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="16" font-weight="600" fill="#f0883e" text-anchor="middle">Standard CFG (P-Control)</text>
+
+  <!-- Step boxes - Standard -->
+  <rect x="55" y="110" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="75" y="127" font-family="monospace" font-size="11" fill="#7ee787">1.</text>
+  <text x="95" y="127" font-family="monospace" font-size="11" fill="#c9d1d9">Compute conditional prediction</text>
+  <text x="95" y="145" font-family="monospace" font-size="12" font-weight="600" fill="#79c0ff">v_cond = model(x_t, t, prompt)</text>
+
+  <rect x="55" y="164" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="75" y="181" font-family="monospace" font-size="11" fill="#7ee787">2.</text>
+  <text x="95" y="181" font-family="monospace" font-size="11" fill="#c9d1d9">Compute unconditional prediction</text>
+  <text x="95" y="199" font-family="monospace" font-size="12" font-weight="600" fill="#79c0ff">v_uncond = model(x_t, t, "")</text>
+
+  <rect x="55" y="218" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="75" y="235" font-family="monospace" font-size="11" fill="#7ee787">3.</text>
+  <text x="95" y="235" font-family="monospace" font-size="11" fill="#c9d1d9">Guidance error (fixed gain)</text>
+  <text x="95" y="253" font-family="monospace" font-size="12" font-weight="600" fill="#79c0ff">e_t = v_cond - v_uncond</text>
+
+  <rect x="55" y="272" width="340" height="44" rx="6" fill="#21262d" stroke="#f85149" stroke-width="1.5"/>
+  <text x="75" y="289" font-family="monospace" font-size="11" fill="#7ee787">4.</text>
+  <text x="95" y="289" font-family="monospace" font-size="11" fill="#f85149">Linear combination (can diverge!)</text>
+  <text x="95" y="307" font-family="monospace" font-size="12" font-weight="600" fill="#ff7b72">v_out = v_uncond + w * e_t</text>
+
+  <!-- Problem callout -->
+  <rect x="55" y="340" width="340" height="70" rx="6" fill="#2d1117" stroke="#f85149" stroke-width="1"/>
+  <text x="75" y="362" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" font-weight="600" fill="#f85149">Problem at high CFG scales:</text>
+  <text x="75" y="382" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#f0883e">Unbounded linear gain causes oversaturation,</text>
+  <text x="75" y="398" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#f0883e">artifacts, and semantic drift</text>
+
+  <!-- Right: SMC-CFG -->
+  <rect x="460" y="60" width="390" height="430" rx="10" fill="#1c2333" stroke="#30363d" stroke-width="1.5"/>
+  <text x="655" y="90" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="16" font-weight="600" fill="#7ee787" text-anchor="middle">SMC-CFG (Sliding Mode Control)</text>
+
+  <!-- Step boxes - SMC -->
+  <rect x="485" y="110" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="505" y="127" font-family="monospace" font-size="11" fill="#7ee787">1.</text>
+  <text x="525" y="127" font-family="monospace" font-size="11" fill="#c9d1d9">Same: compute v_cond, v_uncond</text>
+  <text x="525" y="145" font-family="monospace" font-size="12" font-weight="600" fill="#79c0ff">e_t = v_cond - v_uncond</text>
+
+  <rect x="485" y="164" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="505" y="181" font-family="monospace" font-size="11" fill="#7ee787">2.</text>
+  <text x="525" y="181" font-family="monospace" font-size="11" fill="#c9d1d9">Compute sliding surface</text>
+  <text x="525" y="199" font-family="monospace" font-size="12" font-weight="600" fill="#d2a8ff">s_t = (e_t - e_{t-1}) + lambda * e_{t-1}</text>
+
+  <rect x="485" y="218" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="505" y="235" font-family="monospace" font-size="11" fill="#7ee787">3.</text>
+  <text x="525" y="235" font-family="monospace" font-size="11" fill="#c9d1d9">Nonlinear switching control</text>
+  <text x="525" y="253" font-family="monospace" font-size="12" font-weight="600" fill="#d2a8ff">u_sw = -K * sign(s_t)</text>
+
+  <rect x="485" y="272" width="340" height="44" rx="6" fill="#21262d" stroke="#30363d"/>
+  <text x="505" y="289" font-family="monospace" font-size="11" fill="#7ee787">4.</text>
+  <text x="525" y="289" font-family="monospace" font-size="11" fill="#c9d1d9">Bounded correction</text>
+  <text x="525" y="307" font-family="monospace" font-size="12" font-weight="600" fill="#d2a8ff">e_corrected = e_t + u_sw</text>
+
+  <rect x="485" y="326" width="340" height="44" rx="6" fill="#21262d" stroke="#7ee787" stroke-width="1.5"/>
+  <text x="505" y="343" font-family="monospace" font-size="11" fill="#7ee787">5.</text>
+  <text x="525" y="343" font-family="monospace" font-size="11" fill="#7ee787">Stable guided output</text>
+  <text x="525" y="361" font-family="monospace" font-size="12" font-weight="600" fill="#7ee787">v_out = v_uncond + w * e_corrected</text>
+
+  <!-- Solution callout -->
+  <rect x="485" y="394" width="340" height="70" rx="6" fill="#0d2818" stroke="#238636" stroke-width="1"/>
+  <text x="505" y="416" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" font-weight="600" fill="#7ee787">Correction bounded to [-K, +K]:</text>
+  <text x="505" y="436" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#56d364">Prevents divergence at any CFG scale.</text>
+  <text x="505" y="452" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#56d364">Lyapunov-stable finite-time convergence.</text>
+
+  <!-- Arrow between panels -->
+  <path d="M 425 275 L 455 275" stroke="#484f58" stroke-width="2" fill="none" marker-end="url(#arrowhead)"/>
+  <defs>
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+</svg>

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+      <stop offset="100%" style="stop-color:#533483"/>
+    </linearGradient>
+  </defs>
+  <rect width="900" height="200" rx="12" fill="url(#bg)"/>
+  <rect x="0" y="185" width="900" height="15" rx="0 0 12 12" fill="url(#accent)" opacity="0.8"/>
+  <text x="450" y="75" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="48" font-weight="700" fill="#ffffff" text-anchor="middle">SMC-CFG Ctrl</text>
+  <text x="450" y="115" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="20" fill="#a0a0c0" text-anchor="middle">Sliding Mode Control for Classifier-Free Guidance</text>
+  <text x="450" y="150" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="15" fill="#707090" text-anchor="middle">ComfyUI Node  |  Based on CFG-Ctrl (CVPR 2026)</text>
+</svg>

assets/node-wiring.svg

@@ -0,0 +1,87 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 860 320">
+  <defs>
+    <linearGradient id="wbg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#0d1117"/>
+      <stop offset="100%" style="stop-color:#161b22"/>
+    </linearGradient>
+  </defs>
+  <rect width="860" height="320" rx="12" fill="url(#wbg)"/>
+
+  <text x="430" y="32" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="18" font-weight="700" fill="#e6edf3" text-anchor="middle">Node Wiring in ComfyUI</text>
+
+  <!-- Node 1: Checkpoint Loader -->
+  <rect x="30" y="70" width="180" height="100" rx="8" fill="#1c2333" stroke="#30363d" stroke-width="1.5"/>
+  <rect x="30" y="70" width="180" height="28" rx="8" fill="#2d333b"/>
+  <rect x="30" y="90" width="180" height="8" fill="#2d333b"/>
+  <text x="120" y="89" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" font-weight="600" fill="#e6edf3" text-anchor="middle">Load Checkpoint</text>
+  <!-- Output dot -->
+  <circle cx="210" cy="120" r="6" fill="#79c0ff" stroke="#1c2333" stroke-width="2"/>
+  <text x="120" y="120" font-family="monospace" font-size="10" fill="#8b949e" text-anchor="middle">MODEL</text>
+  <circle cx="210" cy="145" r="6" fill="#d2a8ff" stroke="#1c2333" stroke-width="2"/>
+  <text x="140" y="145" font-family="monospace" font-size="10" fill="#8b949e" text-anchor="middle">CLIP</text>
+
+  <!-- Wire: Checkpoint -> SMC-CFG Ctrl -->
+  <path d="M 216 120 C 260 120, 260 120, 300 120" stroke="#79c0ff" stroke-width="2.5" fill="none"/>
+
+  <!-- Node 2: SMC-CFG Ctrl (highlighted) -->
+  <rect x="300" y="55" width="220" height="195" rx="8" fill="#1c2333" stroke="#e94560" stroke-width="2"/>
+  <rect x="300" y="55" width="220" height="28" rx="8" fill="#3d1a2e"/>
+  <rect x="300" y="75" width="220" height="8" fill="#3d1a2e"/>
+  <text x="410" y="74" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" font-weight="700" fill="#ff7b72" text-anchor="middle">SMC-CFG Ctrl</text>
+  <!-- Input dot -->
+  <circle cx="300" cy="120" r="6" fill="#79c0ff" stroke="#1c2333" stroke-width="2"/>
+  <text x="365" y="108" font-family="monospace" font-size="10" fill="#8b949e" text-anchor="middle">model</text>
+
+  <!-- Parameters -->
+  <rect x="315" y="120" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="325" y="135" font-family="monospace" font-size="10" fill="#d2a8ff">smc_cfg_lambda</text>
+  <text x="490" y="135" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">5.0</text>
+
+  <rect x="315" y="148" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="325" y="163" font-family="monospace" font-size="10" fill="#d2a8ff">smc_cfg_K</text>
+  <text x="490" y="163" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">0.2</text>
+
+  <rect x="315" y="176" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="325" y="191" font-family="monospace" font-size="10" fill="#d2a8ff">warmup_steps</text>
+  <text x="490" y="191" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">0</text>
+
+  <!-- Output dot -->
+  <circle cx="520" cy="120" r="6" fill="#79c0ff" stroke="#1c2333" stroke-width="2"/>
+  <text x="470" y="220" font-family="monospace" font-size="10" fill="#8b949e" text-anchor="middle">MODEL</text>
+
+  <!-- Wire: SMC-CFG -> KSampler -->
+  <path d="M 526 120 C 570 120, 570 120, 610 120" stroke="#79c0ff" stroke-width="2.5" fill="none"/>
+
+  <!-- Node 3: KSampler -->
+  <rect x="610" y="55" width="220" height="220" rx="8" fill="#1c2333" stroke="#30363d" stroke-width="1.5"/>
+  <rect x="610" y="55" width="220" height="28" rx="8" fill="#2d333b"/>
+  <rect x="610" y="75" width="220" height="8" fill="#2d333b"/>
+  <text x="720" y="74" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" font-weight="600" fill="#e6edf3" text-anchor="middle">KSampler</text>
+  <!-- Input dot -->
+  <circle cx="610" cy="120" r="6" fill="#79c0ff" stroke="#1c2333" stroke-width="2"/>
+  <text x="670" y="108" font-family="monospace" font-size="10" fill="#8b949e" text-anchor="middle">model</text>
+
+  <!-- KSampler params -->
+  <rect x="625" y="120" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="635" y="135" font-family="monospace" font-size="10" fill="#8b949e">steps</text>
+  <text x="800" y="135" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">20</text>
+
+  <rect x="625" y="148" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="635" y="163" font-family="monospace" font-size="10" fill="#f0883e">cfg</text>
+  <text x="800" y="163" font-family="monospace" font-size="10" fill="#f0883e" text-anchor="end">7.5</text>
+
+  <rect x="625" y="176" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="635" y="191" font-family="monospace" font-size="10" fill="#8b949e">sampler</text>
+  <text x="800" y="191" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">euler</text>
+
+  <rect x="625" y="204" width="190" height="22" rx="4" fill="#21262d"/>
+  <text x="635" y="219" font-family="monospace" font-size="10" fill="#8b949e">scheduler</text>
+  <text x="800" y="219" font-family="monospace" font-size="10" fill="#7ee787" text-anchor="end">normal</text>
+
+  <!-- Positive/Negative conditioning wires (from off-screen) -->
+  <circle cx="610" cy="145" r="6" fill="#d2a8ff" stroke="#1c2333" stroke-width="2"/>
+  <circle cx="610" cy="170" r="6" fill="#d2a8ff" stroke="#1c2333" stroke-width="2"/>
+
+  <!-- Legend -->
+  <text x="430" y="300" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#484f58" text-anchor="middle">Insert the SMC-CFG Ctrl node between your model loader and sampler. Use higher CFG scales than usual.</text>
+</svg>

assets/parameters.svg

@@ -0,0 +1,83 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 860 440">
+  <defs>
+    <linearGradient id="pbg" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#0d1117"/>
+      <stop offset="100%" style="stop-color:#161b22"/>
+    </linearGradient>
+  </defs>
+  <rect width="860" height="440" rx="12" fill="url(#pbg)"/>
+
+  <text x="430" y="35" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="20" font-weight="700" fill="#e6edf3" text-anchor="middle">Parameter Guide</text>
+
+  <!-- Lambda -->
+  <rect x="30" y="55" width="390" height="165" rx="10" fill="#1c2333" stroke="#d2a8ff" stroke-width="1.5"/>
+  <text x="50" y="82" font-family="monospace" font-size="15" font-weight="700" fill="#d2a8ff">smc_cfg_lambda</text>
+  <text x="380" y="82" font-family="monospace" font-size="13" fill="#7ee787" text-anchor="end">default: 5.0</text>
+
+  <text x="50" y="108" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">Sliding surface coefficient. Controls how aggressively the</text>
+  <text x="50" y="124" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">controller corrects accumulated guidance errors.</text>
+
+  <!-- Lambda scale -->
+  <rect x="50" y="145" width="350" height="8" rx="4" fill="#21262d"/>
+  <rect x="50" y="145" width="35" height="8" rx="4" fill="#56d364"/>
+  <rect x="85" y="145" width="140" height="8" fill="#f0883e"/>
+  <rect x="225" y="145" width="175" height="8" rx="0 4 4 0" fill="#f85149"/>
+  <text x="50" y="170" font-family="monospace" font-size="10" fill="#56d364">0</text>
+  <text x="155" y="170" font-family="monospace" font-size="10" fill="#f0883e" text-anchor="middle">5.0 (sweet spot)</text>
+  <text x="400" y="170" font-family="monospace" font-size="10" fill="#f85149" text-anchor="end">50</text>
+
+  <text x="50" y="195" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#7ee787">Low: gentle, preserves original CFG behavior</text>
+  <text x="50" y="210" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#f85149">High: aggressive correction, may over-constrain</text>
+
+  <!-- K -->
+  <rect x="440" y="55" width="390" height="165" rx="10" fill="#1c2333" stroke="#79c0ff" stroke-width="1.5"/>
+  <text x="460" y="82" font-family="monospace" font-size="15" font-weight="700" fill="#79c0ff">smc_cfg_K</text>
+  <text x="790" y="82" font-family="monospace" font-size="13" fill="#7ee787" text-anchor="end">default: 0.2</text>
+
+  <text x="460" y="108" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">Switching gain. Bounds the per-element correction</text>
+  <text x="460" y="124" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">magnitude to [-K, +K]. Think of it as a safety clamp.</text>
+
+  <!-- K scale -->
+  <rect x="460" y="145" width="350" height="8" rx="4" fill="#21262d"/>
+  <rect x="460" y="145" width="15" height="8" rx="4" fill="#56d364"/>
+  <rect x="475" y="145" width="90" height="8" fill="#f0883e"/>
+  <rect x="565" y="145" width="245" height="8" rx="0 4 4 0" fill="#f85149"/>
+  <text x="460" y="170" font-family="monospace" font-size="10" fill="#56d364">0</text>
+  <text x="505" y="170" font-family="monospace" font-size="10" fill="#f0883e" text-anchor="middle">0.2</text>
+  <text x="810" y="170" font-family="monospace" font-size="10" fill="#f85149" text-anchor="end">5.0</text>
+
+  <text x="460" y="195" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#7ee787">Low: subtle correction, smooth results</text>
+  <text x="460" y="210" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#f85149">High: strong correction, may cause chattering</text>
+
+  <!-- Warmup -->
+  <rect x="30" y="240" width="390" height="175" rx="10" fill="#1c2333" stroke="#f0883e" stroke-width="1.5"/>
+  <text x="50" y="267" font-family="monospace" font-size="15" font-weight="700" fill="#f0883e">warmup_steps</text>
+  <text x="380" y="267" font-family="monospace" font-size="13" fill="#7ee787" text-anchor="end">default: 0</text>
+
+  <text x="50" y="293" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">Initial denoising steps with NO guidance at all.</text>
+  <text x="50" y="309" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">Pure conditional prediction. Lets the model establish</text>
+  <text x="50" y="325" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="12" fill="#8b949e">rough structure before guidance corrects direction.</text>
+
+  <!-- Timeline -->
+  <rect x="50" y="350" width="350" height="20" rx="4" fill="#21262d"/>
+  <rect x="50" y="350" width="70" height="20" rx="4" fill="#2d333b" stroke="#f0883e" stroke-width="1"/>
+  <rect x="120" y="350" width="280" height="20" rx="0 4 4 0" fill="#0d2818" stroke="#238636" stroke-width="1"/>
+  <text x="85" y="364" font-family="monospace" font-size="9" fill="#f0883e" text-anchor="middle">warmup</text>
+  <text x="260" y="364" font-family="monospace" font-size="9" fill="#7ee787" text-anchor="middle">SMC-CFG active</text>
+
+  <text x="50" y="393" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#8b949e">Typical: 0-5 steps. Try 2-3 for more diverse compositions.</text>
+
+  <!-- CFG Scale recommendations -->
+  <rect x="440" y="240" width="390" height="175" rx="10" fill="#1c2333" stroke="#7ee787" stroke-width="1.5"/>
+  <text x="460" y="267" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="15" font-weight="700" fill="#7ee787">Recommended CFG Scales</text>
+
+  <text x="460" y="295" font-family="monospace" font-size="12" fill="#c9d1d9">Model             CFG Scale</text>
+  <rect x="460" y="302" width="350" height="1" fill="#30363d"/>
+
+  <text x="460" y="322" font-family="monospace" font-size="12" fill="#79c0ff">SD 1.5 / SDXL      7.0 - 12.0</text>
+  <text x="460" y="344" font-family="monospace" font-size="12" fill="#79c0ff">SD3 / SD3.5        7.5</text>
+  <text x="460" y="366" font-family="monospace" font-size="12" fill="#79c0ff">FLUX.1-dev         2.0 - 3.0</text>
+  <text x="460" y="388" font-family="monospace" font-size="12" fill="#79c0ff">Wan 2.1/2.2        5.0</text>
+
+  <text x="460" y="408" font-family="Segoe UI, Helvetica, Arial, sans-serif" font-size="11" fill="#8b949e">SMC-CFG lets you push CFG higher than usual</text>
+</svg>