Mask Edit — Transform/Draw/Points/BBox

Mask Edit (MEC) is the swiss-army knife of this pack: one node, five editing modes, and an eight-port output schema that stays the same no matter which mode you're in. It's a dispatcher - pick a mode and the corresponding widgets drive the engine. Transform a mask, draw a shape, place SAM points, or smooth a bounding-box track, all from the same node.

The reason it exists: the pack's README points out that legacy mask editing scattered the same job across half a dozen nodes. This one collapses them. If you're not sure which MEC editing node to use, start here.

The five modes

• transform - the workhorse. Feeds on a mask input and does per-axis morphing and shifting: expand_x/expand_y (dilate/erode, negative erodes), blur_x/blur_y (directional Gaussian), offset_x/offset_y (translate), plus feather, threshold (binarize), and invert. It's the quick "grow the mask 8 pixels" or "feather the edge" fix you'll reach for constantly.
• draw_shape - 12 shapes from a dropdown (circle, rectangle, ellipse, polygon, line, triangle, star, diamond, cross, rounded rectangle, heart, arrow) with named params: center, radius, size, rotation, thickness, value (fill intensity), and an operation blend (set/add/subtract/max/min). There's a batch_size for making N frames of the shape - handy for a video wipe.
• draw_advanced - the power version: raw shape_params_json for anything the named params don't cover.
• points_bbox - the interactive canvas mode. The editor_data JSON carries your points and boxes from the JS widget (wire a reference_image and the canvas draws on it), and the node emits SAM-ready outputs.
• bbox_smooth - temporal smoothing for a sequence of [x,y,w,h] boxes, via bboxes_json, smoothing_radius, smoothing_method, and alpha. The fix for a jittery tracker.

Because it's pure CPU, it's instant - no GPU, no models.

Outputs that matter

The 8-port schema is fixed, which makes downstream wiring stable regardless of mode: mask, then SAM-facing data - positive_coords, negative_coords, points_json, bbox_json - plus bboxes, neg_bboxes, and primary_bbox. In points_bbox mode these feed straight into the pack's SAM nodes (or MaskOpsMEC) as point/box prompts. In other modes the ones that don't apply come back empty or zeroed, so don't panic at a [].

Install

cd ComfyUI/custom_nodes
git clone https://github.com/Code2Collapse/ComfyUI-CustomNodePacks.git

or ComfyUI Manager → search "CustomNodePacks", restart, confirm [MEC] Loaded ... in the console. No extra dependencies. One gotcha from the tooltips worth internalizing: transform requires a wired mask; if you switch to it without one, nothing comes out the mask port. And remember presets override sliders in the keying nodes - here the mode dropdown decides which widgets are honored at all.