🏗️ PH's AIxArchviz ComfyUI Workflows (FLUX.2 + LTX-2.5)

Dedicated to Architectural Imagery & Animation

Author: Paul Hansen
Version: v1.0_261002
License: CC BY-SA 4.0

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🏆 Sponsorship

• Please consider sponsoring me if you find the results of my work useful. A good way to keep code development open and free is through sponsorship.

• . .

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📺 Showcase & Resources

• 🎥 Showcase Video: YouTube
• ☁️ Run STAGE 1 in the cloud:STAGE 1 on ComfyCloud
• ☁️ Run STAGE 3 in the cloud:STAGE 3 on ComfyCloud (affiliate links, i may earn a commission)
• 💬 Discord: PH's AIxArchviz Discord
• 🌐 Web: https://www.paulhansen.de
• 📸 Instagram: https://www.instagram.com/paulhansen.design/
• 💼 LinkedIn: https://www.linkedin.com/in/ph3d
• 🤗 Custom LoRA: paulhax/flux2-klein-9b-localforestlab

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🎯 Overview

This is a complete rework of my AIxArchviz SDXL x FLUX workflow, rebuilt from scratch around current models: FLUX.2 [klein] 9B for image generation and editing, LTX-2.5 for camera-controlled image-to-video, and a custom LoRA trained for architectural vegetation.

Instead of one monolithic graph, the series is split into three focused workflows plus an all-in-one bundle. Each workflow is packed into subgraphs with only the relevant controls exposed, uses ComfyUI core nodes wherever possible, and runs locally or on ComfyCloud.

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✨ Key Features

Stage I – IMAGE GENERATE (FLUX.2 [klein] base 9B)

• Visual guidance: Load 1 or 2 guidance images (up to 4 MP / 2048×2048) such as depth, canny, normals, sketches, lineart or scribbles straight from your 3D software, and toggle USE 2 INPUT IMAGES to match
• TXT2IMG mode: Ignore the input images and create free assets, e.g. references for IMAGE EDIT
• Custom LoRA: ph_f2k9b_localforestlab_v1 for detailed trees & foliage (trigger word prefilled in the workflow: phflg)
• Built-in upscale with RealESRGAN x2 and a before/after image compare

Stage II – IMAGE EDIT (FLUX.2 [klein] 9B)

• Reference-based editing: Load a base image (image 1) and a reference (image 2), then refer to both in your prompt, e.g. "add the flamingo from image 2 to stand on the summer meadow in image 1, bright sunlight"
• Three ways to mask: an RGB mask image, the ComfyUI Mask Editor, or AUTOMASK BY PROMPT (SAM 3.1)
• Degradation-free: Only the masked area is re-generated (crop & stitch) and the rest of the image stays pixel-identical
• SOFTEN MASK and SEPARATE MASK COMPONENTS (works best with SOFTEN MASK values below 5)
• Auto-enhance, auto-remove and auto-outpaint modes

Stage III – CAMCONTROLLED IMAGE 2 VIDEO (LTX-2.5)

• Camera control by example: Load a still as the first frame and any video as the driving camera animation. The Cameraman IC-LoRA by Cseti transfers the camera move
• Ready-made driving animations in assets/driving_animation: crane_up, dolly_in, truck_right, truck_right_static_target
• Aspect ratio from your image: Resolution snaps to multiples of 32, so expect slight cropping
• Spatial latent upscale plus FILM frame interpolation for smooth output, with audio generated alongside

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✅ These Workflows ARE:

• A potential replacement for many paid services like image enhancement, AI editing and image-to-video
• Tools developed for daily work as a technical artist, from previsualization to final image and animation
• Based on best intentions and latest findings in AI-assisted architectural visualization
• Flexible systems you can adapt and modify to fit your own needs
• Part of a complete workflow that still includes 3D environments, rendering software and manual post-processing

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❌ These Workflows ARE NOT:

• Never-before-seen masterpiece ComfyUI workflows. They're practical tools built from available components
• Ultimate magic technology that produces award-winning images every time
• Standalone solutions. You still need skills in 3D software, prompting and ComfyUI
• Optimized for all hardware. FLUX.2 [klein] 9B and LTX-2.5 22B need a capable GPU. If yours isn't, use the fp8/int8 variants or ComfyCloud

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🎯 Output Quality Depends On:

Your 3D Skills

Your input is crucial. The workflows are designed for architecture-related imagery and assume you can:

• Work in a 3D environment (3ds Max, Blender, SketchUp, …)
• Export suitable guidance passes (depth, canny/outline, normals, segmentation masks)
• Create simple camera animations to use as driving videos

Your Prompting Ability

• Describe materials, environment, light and camera clearly. See the example prompts in assets/inputs
• In IMAGE EDIT, refer to image 1 / image 2 explicitly

Your Hardware

• Use the fp8 / int8 model variants and lower resolutions on smaller GPUs
• All custom nodes used are available on ComfyCloud

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📦 Models Used

Every workflow has a note with direct download links and the folder layout. Gated models need you to log in to huggingface and accept the license before downloading.

FLUX.2 (Image Generate / Image Edit)

LTX-2.5 (CamControlled Image 2 Video)

Model Storage Location (All-in-One)

📂 ComfyUI/
└── 📂 models/
     ├── 📂 checkpoints/
     │    └── sam3.1_multiplex_fp16.safetensors
     ├── 📂 diffusion_models/
     │    ├── flux-2-klein-base-9b.safetensors
     │    ├── flux-2-klein-9b.safetensors
     │    └── ltx-2.5-22b-distilled-transformer-comfy-int8-convrot.safetensors
     ├── 📂 text_encoders/
     │    ├── qwen_3_8b_fp8mixed.safetensors
     │    └── gemma4-12b-with-proj-ltx-2.5-comfy-int8-convrot.safetensors
     ├── 📂 loras/
     │    ├── ph_f2k9b_localforestlab_v1.safetensors
     │    ├── ltx-2.3-22b-distilled-lora-384.safetensors
     │    └── LTX2.3-22B_IC-LoRA-Cameraman_v1_10500.safetensors
     ├── 📂 vae/
     │    ├── flux2-vae.safetensors
     │    ├── ltx-2.5-video-vae-bf16.safetensors
     │    └── ltx-2.5-audio-vae-bf16.safetensors
     ├── 📂 upscale_models/
     │    └── RealESRGAN_x2.pth
     ├── 📂 latent_upscale_models/
     │    └── ltx-2.5-latent-spatial-upscaler-x2-bf16-1.0.safetensors
     └── 📂 frame_interpolation/
          └── film_net_fp16.safetensors

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🔧 Custom Nodes Required

Far fewer than in the SDXL x FLUX workflow: IMAGE GENERATE runs on ComfyUI core nodes only. All packs below are available on ComfyCloud.

The All-in-One workflow needs all of them. Install with the ComfyUI-Manager, or clone each repo into ComfyUI/custom_nodes/, e.g.:

cd <YOUR_PATH_TO_COMFYUI>/ComfyUI/custom_nodes/
git clone https://github.com/kijai/ComfyUI-KJNodes

The workflows were saved with a recent ComfyUI frontend (1.53.x), which supports subgraphs. Update ComfyUI before loading them.

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📁 Repository Structure

📂 AIxArchviz_FLUX2xLTX25/
├── 📂 workflows/            → the four ComfyUI workflows (.json)
└── 📂 assets/
     ├── 📂 inputs/           → example guidance images, prompts & reference images (cabin, pavillon, twist, warroom)
     └── 📂 driving_animation/ → camera driving videos for Img2Video

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📝 Version History

v1.0_261002

• Initial release of the FLUX.2 x LTX-2.5 series, a complete rework of AIxArchviz_SDXLxFLUX
• FLUX.2 [klein] 9B image generate & image edit workflows
• LTX-2.5 camera-controlled image 2 video workflow
• All-in-One bundle
• Custom LoRA ph_f2k9b_localforestlab_v1

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🙏 Acknowledgements

These workflows would not be possible without the great work of the model creators and custom node developers.

Special thanks to:

• Black Forest Labs for FLUX.2 [klein]
• Lightricks for LTX-2.5
• Cseti for the Cameraman IC-LoRA
• Comfy-Org for the repackaged models and ComfyUI
• All the custom node developers listed above
• The ComfyUI community and everyone who has provided feedback and suggestions

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⚖️ License

PH's AIxArchviz ComfyUI Workflows (FLUX.2 + LTX-2.5) © 2026 by Paul Hansen is licensed under CC BY-SA 4.0.

The models used by these workflows have their own licenses. These include the FLUX Non-Commercial License (FLUX.2 [klein]), the LTX-2 Community License (LTX-2.x) and CC BY-NC 4.0 (ph_f2k9b_localforestlab_v1). Check each model's license before any commercial use.

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📚 Additional Notes

Target Audience

These workflows assume you:

• Know your way around a 3D environment (3ds Max, Blender, SketchUp, …)
• Can create the necessary guidance passes and camera animations
• Want to adopt some of these techniques in your own workflows
• Are willing to modify everything to fit your specific needs

Tips for Best Results

1. Prepare your guidance passes carefully. Clean depth and canny passes give the strongest structural control in IMAGE GENERATE
2. Combine two guidance images, e.g. depth + canny, for both volume and edge fidelity
3. Use IMAGE EDIT for local fixes instead of re-generating. Areas outside the mask stay untouched
4. Keep SOFTEN MASK below 5 when using SEPARATE MASK COMPONENTS
5. Match your driving video to your shot. Simple, clean camera moves (dolly, truck, crane) transfer best
6. Use resolutions divisible by 32 for IMG2VIDEO to avoid unexpected cropping

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These workflows are a practical approach to AI-assisted architectural visualization, combining current open models with traditional 3D rendering workflows.