Compositor Mask – Smart Cryptomatte Automation for Blender

Streamline your compositing workflow with Compositor Mask, a powerful Blender addon that automatically assigns Cryptomatte ID mattes based on the objects in your active collection. No more manual input—just clean, efficient node setups tailored to your scene. Ideal for artists who value speed and precision in post-production.

This add-on works in the Compositor Editor. Make sure the Cryptomatte node is selected. In the Mask Collection panel, the active collection will be displayed—this collection is used to generate the mask.

The add-on automatically filters out all object types except Mesh and Curve, which can be individually toggled using checkboxes.

Two main buttons are provided: Add and Remove.

• Add: Collects all Mesh and Curve objects from the active collection, including nested children and objects from child collections. It then sets their names as Matte IDs in the Cryptomatte node.
• Remove: Removes the Matte IDs for objects in the active collection. Objects outside the active collection remain unchanged.
• Recursive: Enable Add to get nested children or descendent of every collection inside the active collection.