Following on from the description of creating extrusions in the Conceptual Massing Environment, here is another subtlety regarding properties of extrusions in the CME.
Offset Properties
Locked extrusions have ‘Positive & Negative Offset’ properties, that drive the distance of the end facets from the original profile. These behave in different ways depending on exactly how the extrusion was created and locked.
Reference Line Extrusions
- Create Form using reference lines as the profile
- Creates an extrusion, which is automatically locked
- The form has Positive and Negative Offsets, relative to the reference lines
- Select the base facet, drag down
- Negative offset value
- Reference lines remain in original position
- Unlock the extrusion – no offset properties
Model Line Extrusion
- Create Form using model lines as the profile
- Extrusion is not locked automatically
- Does not have offsets
- Select the top facet
- Lock the form to an extrusion
- Padlock does not appear (unless…