Monday, 15 December 2008

Revit - Modelling balcony slab with sloped edges

Here's an interesting modelling challenge set by Nilanjana of the London Office. She wanted to quickly produce a balcony, based on the sketch below, for a large high rise residential scheme.


You will see from the diagram above that the majority of the balcony is 450mm deep and is flat as indicated by the blue area. The balcony then falls away on three edges to only 150mm thick. You will also notice the balcony is not rectilinear as indicated, with three sides at different angles.There are a number of different ways to tackle this.... create a family, an in-place family? All have their merits, but at the concept stage of a project you don't always have time to produce what in essence is actually a rather complex family to create. So the easiest way to create the balcony is in four separate elements.

So start by sketching out a few reference planes to define the extent and shape of the balcony.

Next create a new floor slab type which is 450mm thick. Edit the type properties of the construction of the floor slab and set the structure "variable" radio button is ticked. This will ensure that that slab is flush on the underside after you have edited the slab.


Next model four separate slabs based on the reference plane sketches.

4 slabs

You can then slab edit the edges of the three slabs which need to slope away using the sub-element edit tools. Select one of the floor slabs you created and the sub-element edit tools will appear in the options bar.

sub edit

Next select the edit points/edges tools, then select the outer edge of the slab you want to edit and alter the elevation from 0mm to -300mm; this will drop the whole edge of the slab and it will slope as required.

edge edit

Now do this for all the other edges which need to fall away.

dropped edge 

For extra finesse, use the join geometry to clean up all the floor slabs.

result  result

One could argue that this is not a purist approach to the BIM problem because you end up with four slabs rather than one, but at that concept stage where you want to convey an idea, this approach is ideal.

Tuesday, 9 December 2008

Keynote Tag and Model/Annotation Crop Boundaries

Kevin Shumbera in Houston writes:

I'd like to report an easily reproducible issue to watch for (and to pass on to Autodesk).

If an element with a keynote is outside of the model crop region, but the keynote itself is inside the annotation crop, the keynote will NOT show up in plan but will STILL schedule per that sheet.

This happens in dependant and non-dependant views in both 2008 and 2009.

Friday, 5 December 2008

Revit - matching dependent views across multiply views

William Lopez Campo asks:-I have a project which I have created a total of 30 dependent views on one level, how can I create duplicate dependent views on all my other views to match the 30 I have already created, without having to manually create them?

To propagate a series of dependent views from one particular level to the levels above, you need to do the following.

Set up you dependent views as required on one level only, in your case this is 30 dependent views! Next select the primary view associated with these dependent views.


With this view selected, go the view pulldown menu and choose "apply dependent views".


This will open a dialogue box which will allow you to propagate the dependent views you initially created to any other plan view you require.


The additional dependent views will be created for you at each level, based  on the dependent views you initially created. You will obviously have to rename them and it should be noted that the dependent views will not maintain associativity in relationship with the crop regions across the multiple levels.