Definition

Selects only what is needed.

Korean Meaning

필요한 것만 선택한다

Leaf Meaning

Gate extrusions, scatter, and material zones — show only the faces and points the atlas needs.

Examples Across Tools

ToolExample
BlenderCompare + Switch + Delete Geometry — field-driven selection.
PhotoshopLayer masks, clipping masks, and channel selections.
PremiereOpacity masks and track mattes on video layers.
After EffectsMask paths, track mattes, and roto shapes.
NukeRoto, Keyer, and Shuffle cutouts for compositing.
HoudiniGroup SOP and blast selections by attribute.
Vuev-if / v-show gate UI regions in the atlas interface.
Atlas LogosFace-domain masks for terrain zones and district labels.

First Practice

Use Compare + Index to extrude only every second face on a grid, then Delete Geometry on the rest.

Source References

Geometry Nodes Manual.pdf

Manual
File path
source-materials/Geometry+Nodes+Manual.pdf
Note
Creator Alphabet letter "Mask" — geometry nodes manual defines the Blender-side grammar.
View in Sources catalog →

Geometry Nodes List NEW.txt

Course List
File path
source-materials/Geometry+Nodes+List+NEW.txt
Note
Cross-tool operation mask — indexed from course sections covering Mask.
View in Sources catalog →