Geometry Stacks Generator is a Geometry Nodes setup that instances meshes from a designated collection onto the surface of a target object. The tool stacks the instanced geometry across the surface of the underlying mesh, maintaining performance by utilizing instancing. For optimal results, the source meshes within the collection must have similar relative heights and their origins set to their geometry centers. Users append the node group, assign it via a Geometry Nodes modifier, and select their target collection to control the arrangement.