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Line Art

Line Art · screenshot coming soon

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What this node does

Line Art renders a COMFYTV_MODEL into a 2D line drawing instead of a shaded image. It traces the mesh’s feature edges — the silhouette (where the surface turns away from camera), creases (sharp dihedral edges), and boundary (open-mesh borders) — and can hide the lines that fall behind the surface using a BVH ray test, so you get a true visible-line drawing rather than a see-through wireframe. You aim it with the on-card view camera (or leave it empty to auto-frame the model). It runs the vendored mesh3d backend (▶ Run) and outputs a single COMFYTV_IMAGE — the line-art render. This node has no model output; it is a render, not a geometry op. Requires a model on the model input — the stage errors if it’s empty. By default it produces white lines on black, the convention ControlNet lineart expects. Outputs are ComfyTV snapshots, not native tensors — insert a Bridge to feed native ComfyUI nodes (bridges docs).

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When to use it

  • Generate a ControlNet lineart map from a 3D model to drive an image workflow with exact shape control.
  • Produce a technical / blueprint-style line drawing of a mesh.
  • Get an inked outline of a model for a comic or storyboard panel.

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Parameters

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width / height

Output resolution in pixels. Both default 1024, range 256–4096 (step 64).

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thickness

Line width in output pixels. Default 2.0, range 0.5–8.0 (step 0.5).

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silhouette

Draw silhouette edges — where the surface turns away from the camera. Default on.

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crease

Draw crease edges — sharp edges whose dihedral angle exceeds crease_angle. Default on.

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boundary

Draw boundary edges — the border edges of an open mesh. Default on.

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crease_angle

The angle (°) between adjacent face normals above which an edge counts as a crease. Default 60.0, range 1–179. Lower it to catch softer edges, raise it to keep only very sharp ones.

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occlusion

Hide lines that fall behind the surface, via a BVH ray test. Default on. Turn it off for a wireframe-style see-through drawing where back edges show through.

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invert

off (default) = white lines on black, the ControlNet lineart convention. on = black lines on white (ink-on-paper look).

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camera

Internal (hidden). The view camera (position / target / fov JSON) set by the node body. Empty = the model is auto-framed.

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model

The COMFYTV_MODEL to render. Required — the stage errors without it.

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Outputs

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Tips

  • For ControlNet lineart, leave invert off (white on black); flip it on only when you want a printable ink look.
  • If the drawing is cluttered with interior lines, keep occlusion on and raise crease_angle so only genuinely sharp edges are inked.
  • Boundary lines only appear on open meshes; a watertight solid draws its outline from silhouette and crease edges.
  • Set the view with the on-card camera before running — an auto-frame may not pick the angle you want.
  • Mesh Primitive / Mesh Ops / Mesh Boolean — build and clean the model you render.
  • Bridge — pass the lineart image to a native ComfyUI ControlNet node.