# Mechanism

Some geometric entities are linked together so that they remain rigidly connected.

This connection information can be retrieved using the following functions. For more information, see`Rigid Links <https://docs.techsoft3d.com/exchange/latest/guide/advanced.html#rigid-links>`__section in the programming guide.

Parameters

> pOwnerNode: The base Product Occurrence the resulting list in built on.

> puiNumberOfFixedSubNodes: The size `pppFixedSubNodes`

> pppFixedSubNodes: The resulting array.

Returns

> `A3D_SUCCESS`on success, or an error code on failure

Functions

- `A3DAsmGetFixedComponents()`
- `A3DAsmGetFixedTogetherComponents()`
- `A3DAsmGetFlexibleComponents()`

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