Geometry Nodes builds geometry procedurally as a node tree flowing from Group Input to Group Output

Geometry Nodes is Blender’s system for modifying an object’s geometry with node-based operations, added via a Geometry Nodes modifier and edited in the Geometry Node Editor. The node tree is a Node Group: the geometry from before the modifier is passed into the Group Input node, the node group operates on it, and the result exits through the Group Output node to the next modifier. Because the geometry is generated by the node graph rather than edited by hand, it is procedural and non-destructive — changing a node parameter re-computes the whole result, so a single graph can be driven parametrically (and thus animated or reactive) rather than sculpted vertex by vertex. This makes Geometry Nodes the natural place to build audio-reactive or generative geometry for live visuals.

Examples

A node group that scatters instances across a surface: change the density input and the whole scatter re-computes. Feeding a value node from a driver lets geometry respond to an external parameter over time.

Assessment

Describe how data flows through a Geometry Nodes tree from input to output, and explain why procedural (node-based) geometry is easier to animate parametrically than hand-edited meshes.