# 3.1.16: Support Agent
Sometimes it is more convenient to define the locations of supports using geometric relationships rather than specifying node coordinates or node indices directly. This is where the *Support Agent* components are useful.
Fig. 3.1.16.1: Definition of supports via a Support Agent-component.
Figure 3.1.16.1 shows a Support Agent component. The inputs **Plane**, **Ct**, **Cr**, and **Dofs** have the same meaning as in the Support component described in section [3.1.15: Support](/3-in-depth-component-reference/3.1-model/3.1.16-support.md).
These inputs allow you to define geometric conditions for placing supports:
* **ToElemIds**: IDs of elements whose nodes may receive supports. If left empty, all elements in the model are considered eligible. Regular expressions may be used for refined selection.
* **ToGeom**: A list of geometric objects—such as points, planes, curves, breps, or meshes—at which supports should be placed.
* **InGeo**: A list of closed geometric objects—such as curves, breps, or mesh volumes—inside which supports may be added.
When multiple inputs are provided, the placement conditions are combined using logical **AND**.
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