Wednesday, May 20, 2015

Create View Template - Tool Description

Oh so...subtle...

The command via the ribbon is called Create Template from Current View.

The right-click context menu offers this version of the command instead (Create View Template From View).

It's subtle because the right-click version is based on the fact that we've selected a view and used right-click. The context doesn't demand using the language Current View because it's based on the view we selected in the first place. The ribbon version leaves out the word View because it is listed as part of the View Templates button already. It also declares that it will create the template based on the Current View since it is possible to have accidentally changed which view has focus prior to using the command; for example if views are tiled or cascading in the drawing window.

My initial reaction was that they were inconsistent and wrong to use a different description for a command that will produce the same result. After mulling it over I think it is a reasonable subtlety since their use is different and the phrasing is intended to help us know what to expect in each situation.

Sunday, May 17, 2015

Revit 2016 - IFC Observations

Autodesk recommends that we visit Autodesk Exchange|Apps to download the latest IFC application before starting to work with IFC data.

While testing these features I exported some walls and doors to IFC 2x3 so I could import them as IFC geometry. When I used Link IFC there were Generic Model openings filling the door openings to provide room bounding geometry.

There is a bit more going on behind the scenes when we import IFC. In the past we had to open an IFC which created a Revit project file we could then link. Those extra steps are done for us now as a background operation. There are three files that Revit creates based on the source IFC we link.

If I get obnoxious and delete these files and then open my active project file I get a warning message that Revit couldn’t find a linked file. When I use Reload From and select the IFC file I linked in the first place Revit creates those three files all over again. In the background it’s really just referencing the IFC file named "Linking.ifc.RVT".

I then opened the .RVT file that Revit created during the Link IFC process and deleted the openings and replaced them with Room Separator lines. Rather than doing that we can just leave the Generic Model elements but we need to use a Filter to turn them off. Revit creates a shared parameter file based on the IFC data. We can create a Project Parameter using one of its parameters (ObjectTypeOverrides) so we can create a Filter focused on the Generic Model category.

Once we understand that we can use the same approach to override the appearance of the existing walls, doors and windows so they look more like existing elements.

Saturday, May 16, 2015

Revit 2016 - IFC Snap Align and Dimensions

We can snap to IFC link elements to create new elements and we can also dimension to elements in the link. We can also Align Revit elements to IFC-based elements as well as Host some face-based families, such as electrical devices. Dimensions will only recognize the faces of linked IFC geometry and not any center lines, reference planes, or other non-geometry elements.

This is a plan view of linked IFC walls and doors along with a few local walls and doors. Rooms were added to the overall plan, using the room bounding setting for the linked IFC file.

If the IFC file changes and it is reloaded into the Revit model, previously established references may not be maintained. We’ll have to make sure they are intact. It is difficult to ensure that changes to IFC geometry will retain relationships between any dimensions that reference it.

Thursday, May 14, 2015

Revit 2016 - Truss Chord Rotation

When we rotate a truss we can either allow the chords to rotate with the truss or stay aligned with the truss placement plane (usually vertical).