November 9, 2011

QTO and Revit Underlays

Do you use QTO with Revit Models? You should be aware of a bug with QTO and Revit Views that use another Revit View as an Underlay. QTO will quantify any object in the current view including objects in the underlay. A very easy test is to create four walls on Level 1 that form a rectangle, 20'x30'. Create 4 walls on Level 2 that form a rectangle, 20'x15'. Place the Level 2 walls directly above the Level 1 walls and keep Level 1 as in underlay to Level 2. Export your Revit model to DWF and import into QTO. Do a model takeoff and look at the linear takeoff for each level.

You will see QTO has counted for Level 1: 4 Walls . Total linear takeoff - 100'.

You will see QTO has counted for
Level 2: 8 walls (4 on Level 1 and 4 on Level 2). Total linear takeoff of 170' instead of the correct 70.

The good news is the Total Linear Takeoff for the PROJECT is correct. It is NOT Level 1: 100' + Level 2: 170'. It calculates the project total for Level 1:100' + Level 2:70'=170'.

Mark Petrucci

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