Single point in 3D geometry — multiple vertices form polygons and mesh structures. Every deformation, animation, and rigging operation works at vertex level.
In 3D space, work is done at the lowest geometric level — that's where the vertex resides. A single point in three-dimensional space, defined by X, Y, and Z coordinates. Multiple vertices connect to form edges, which in turn define polygons. Thousands or millions of such points create the mesh — the digital geometry that VFX supervisors and 3D artists work with.
On set or in the edit, you see this most directly in character animation and deformation. A rigged character — such as a digital human or creature — consists of a skeleton (bones) and a mesh layered over it. Each vertex of the mesh is connected to one or more bones (weight painting). When a bone moves, the vertices follow — their positions change in 3D space. This is called skinning. Incorrectly weighted vertices lead to penetration (mesh passing through other objects) or to unnatural-looking creases and deformations.
You also work vertex-based during modeling itself. Retopology, for example — redrawing geometry over a high-resolution sculpt — is ultimately vertex placement. Each point is positioned by hand or through automatic tools. In the edit then: vertex animation. A banner intended to flutter gets fewer vertices at its base, but many more at its outer edge — where movement and detail are needed. A sea simulation runs similarly. Millions of vertices, manipulated by a simulator to create waves.
Important for the workflow: vertex count directly impacts performance and render time. An ultra-high-poly mesh can slow down simulation and rendering. Hence the hierarchy — hero assets (prominent objects, close to the camera) get many vertices, background geometry is aggressively reduced. Also during export and with constraints: if you want to tell a rigged model that an arm vertex should remain in a specific position, you pin it — and the solver respects that.
Debugging deformation problems often involves vertex inspection. In a DCC tool (Maya, Blender, Houdini), you select individual vertices, check their weights, their animation keys, their constraints. Is the topology correct? Are the normals consistent? You answer these questions at the vertex level.