ComfyUI-Charon

Custom ComfyUI nodes for CHARON auto-alignment and DA3 camera export.

Contents

• __init__.py: node registrations.
• nodes/auto_align.py: CHARON_3D_Auto_Align (mesh alignment with optional symmetry + ground snap). Returns both the file path and a transform JSON, and publishes the mesh in ui.meshes so it shows in Comfy history.
• nodes/charon_camera.py: CHARON_Camera_From_DA3 (converts DA3 intrinsics/extrinsics to a Nuke Camera3 snippet, with optional transform application).

Installation

1. Copy this repo folder into your ComfyUI/custom_nodes/ directory (you can name it ComfyUI_CHARON if you want to match the internal label).
2. Install deps in your ComfyUI Python environment:

   pip install -r requirements.txt
   

   (Only trimesh is required; NumPy is bundled with ComfyUI.)
3. Restart ComfyUI.

Usage

CHARON_3D_Auto_Align

• Inputs: mesh_path, symmetry, ground_snap, filename_prefix (default charon_mesh), save_transform_json.
• Outputs:
  • aligned_mesh_file: path to the saved aligned mesh in ComfyUI’s output dir.
  • transform_json: JSON with rotation (3x3) and translation (xyz).
• The node also advertises the mesh in the ui.meshes block so it appears in history/downloads.

CHARON_Camera_From_DA3

• Inputs: DA3 extrinsics_json, intrinsics_json, batch_index, image_width/image_height, sensor_width_mm, optional transform_json from the align node, optional Nuke export toggle/prefix.
• Outputs: nukecam_file (if enabled) and nukecam_text (Camera3 snippet with additive Euler/translation).

Place the two nodes in a Comfy graph, feed a mesh into CHARON_3D_Auto_Align, and optionally feed its transform_json into CHARON_Camera_From_DA3 to move the DA3 camera to match the aligned mesh.***