Most components in a factory are placed relative to the floor. Conveyors and other equipment sit on the floor, but items like hoppers and ductwork are usually positioned at a specific height above the floor.
The landing surface of a model defines how it sits on the factory floor. Models are initially placed so the model coordinate system aligns with the factory coordinate system. You can set the landing surface by selecting three points on the model to define a plane. You can also change the landing surface of a model if it requires a different orientation. For example, a strut channel can be mounted on the ceiling or on a wall, so the landing surface depends on the location.
For machinery, you simply pick points on the mounting feet and it will sit on the floor. For objects like pipe hangers, you pick the points where you want to set the height. The model is placed on the floor, and you can use Grip Snap to move it to the correct height.
