5.0 Graphical/Geometric Object Modelling
This section of the standard deﬁnes the generic modelling requirements for the graphical element of the BIM object.
5.3 What to model
| ||5.3 What to model |
This sub-section of the standard defines what should and shouldn’t be included in the geometric model of the object, such as maintenance zones, hidden content and other spatial requirements.
| 5.3.1 ||Pre-planning |
| ||The geometric modelling of the object shall be planned, including any parametric relationships, so as to consider what graphical detail is required/necessary and what information will be visible in different views. |
Note: Small elements or non-critical elements of the object may not require modelling as these may impact model performance.
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| 5.3.2 ||Detail |
| ||The object shall represent the form of the physical element’s external boundary without providing excessive or unnecessary detail. |
Detail that would not be visible (or hidden), should not be modelled, unless required for the intended BIM use.
For example, the face of a chest of drawers only need show the face of each drawer, the drawer itself shall not be modelled.
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| 5.3.3 ||Connection points |
| ||Objects that are required to connect to other objects, such as a fan unit to a duct, shall have the relative position of their connection points accurately modelled. |
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| 5.3.4 ||Spatial requirements |
| ||Objects representing physical elements that have spatial requirements, such as clearance zones, operation zones or maintenance zones, shall also have such spatial requirements modelled. |
The modelled spatial requirements shall have their visibility controlled, with the default being that the spatial zones are not visible.