Roto
Interactive bezier spline rotoscoping. Draw precise mask shapes with curves, rectangles, and ellipses.
Roto provides interactive shape-based masking directly in the preview panel. Use the Pen tool to draw bezier splines for precise curved selections, or use Rectangle and Ellipse tools for quick geometric masks. Multiple shapes can be combined.
Auto-smooth mode automatically adds curve handles to pen points for smooth splines without manual handle adjustment.
Parameters
Section titled “Parameters”Pins
Output
Output mask width
Output mask height
Shapes
Active editing tool in the manipulator
Currently selected shape index (-1 = none)
Auto-smooth bezier handles when adding pen points
Bezier shape list (edited via the canvas manipulator)
Global
Show the mask as a tinted overlay on the input
Invert the entire mask output
Per-shape controls
Section titled “Per-shape controls”Selecting a shape reveals a Selected Shape section in the Parameters panel with controls that belong to that shape alone, not to the node:
| Control | What it does |
|---|---|
| Name | A label for the shape, so a graph with several is readable. |
| Combine | Add merges the shape into the mask; Subtract cuts it out. New shapes default to Add. |
| Grow (px) | Expands (positive) or shrinks (negative) the shape’s mask without editing the path. Applied before feathering. |
| Feather (px) | Blur radius around the shape edge. |
| Placement | Where the feathered edge sits relative to the path. Outside keeps the shape solid up to the path and softens outward, Centered softens equally to both sides, and Inside softens entirely within the path. |
| Opacity (%) | How strongly the shape contributes to the mask. |
Newly drawn shapes feather Outside, so feathering softens the edge without eating into the shape. Shapes in documents saved before Placement existed keep the Centered feathering they were made with.
Double-click or right-click any of these sliders to reset it to its default.
Usage Tips
Section titled “Usage Tips”- Use the Pen tool for complex selections: click to add points, drag to add curve handles.
- Enable Auto-smooth for fast curved selections without manually adjusting handles.
- Combine multiple shapes in one Roto node; shapes default to Add but can be set to Subtract individually.
- Reach for Grow instead of redrawing when a mask is close but sits a few pixels inside or outside the object.
- Pair a small positive Grow with an Inside placement to soften an edge while keeping the mask’s coverage.
- Use the Select tool to adjust points and handles after drawing.