Rotoscoping in Nuke involves tracing or isolating specific objects or elements in a video frame by frame. This technique is commonly used in visual effects to separate foreground elements from the background.
Import Footage:
Open Nuke and create a new project.
Import the footage you want to rotoscope by using the ‘Read’ node.
Create a Roto Node:
Right-click in the Node Graph and select “Draw” > “Roto.”
the Roto node to the footage node.
Rotoscope the First Frame:
Go to the first frame of your footage.
Use the Roto node to draw a shape around the object you want to rotoscope.
Make sure the shape encloses the entire object you want to isolate.
Keyframes:
Move a few frames forward in the timeline.
Adjust the shape of the Roto node to match the object’s movement.
Press ‘A’ on your keyboard to set a keyframe for the current frame.
HeadTorso and ArmsLegsBridgeNode network
Refine the Rotoscope:
Continue moving forward frame by frame, adjusting the shape of the Roto node as needed.
Use the handles on the Roto shape to modify its contours.
Set keyframes at regular intervals to ensure accurate tracking.
Feathering and Edge Blur:
To create a smoother transition between the roto shape and the background, use the “Feather” control in the Roto node.
Adjust the feather settings to control the softness of the roto edge.
Track the Rotoscope:
In Nuke, you can use the built-in tracker to automate the tracking process. Select the Roto node, go to the “Tracker” tab, and enable it.
Adjust tracking settings, such as search area and correlation, to achieve accurate tracking.
Fine-tune the results by manually adjusting keyframes if necessary.
Tracking to assist roto
Review and Adjust:
Play through the sequence to review your rotoscoping work.
Make any necessary adjustments to the Roto node or keyframes.
Output:
Connect the Roto node to the desired downstream nodes for further compositing.
You can use the roto shape as a mask for other nodes or apply color correction, effects, etc.
Render:
Once satisfied with the rotoscoping, render the final result.
