Demons In Your Data?

The more you work with Revit the more likely you are to run into demons in the data. What do I mean by demons? Demons are unexplained behaviors. I'm not talking about software bugs that won't go away until you've installed a software update. I'm talking about errors in the data of the project file itself. Errors that can be repaired by replacing the corrupt data with an arbitrary value and then changing it back again.

Somehow, the process of changing the offending data to something arbitrary, then changing it back to the way it should be can remedy unexplained behaviors. I'm not talking about changing a value and then hitting the undo command. I'm talking about using Revit's tools to change the data to something arbitrary then changing it back... like the change is some new data for the model. It's just a matter of isolating the parameter values that are causing the unexplained behaviors... then finding the right combination of commands that will reset or refresh the offending data. These commands might include flexing parameters, cut & paste in same place, mirror, nudging, or possibly other commands. Let me give you some examples...

I upgraded a model once, from Revit 2009 to Revit 2011, and an odd thing happened. In hidden line mode, half the doors and windows had shaded glass (by design) while the other half had no shading. And it wasn't like there was any consistency... the shading was gone from random doors and windows. I realized at that point that I had a demon in my data, so I went into the offending material (glass) and set the surface pattern of the glass material to none (it was the surface pattern that was not cooperating), then changed the surface pattern back to solid fill to get this glass material to show properly everywhere.

Another thing that happens a lot... I like to nest families into a host family and link the parameters of the nested family and its host family, but once in a while after making a change to a nested family and loading it back into the host family, solids disappear or just don't flex when the family is loaded into a project. I have to flex some of the linked parameters, while still in the family editor, to reset or refresh the offending data.

Wall cleanups at intersections (not to beat a dead horse) can also cause demons. Sometimes nudging one of the walls can cleanup your intersection. Sometimes you have to cut a wall to your clipboard and paste it back into the same place to get intersections to heal properly. In fact, when any family (that was working fine before) isn't cooperating try a cut and paste in same place. This can reset data in the model.

If any of my readers are familiar with a particular demon please feel free to leave a comment describing the demon and how you "exorcised" it.

Should I enable Hardware Acceleration?

Hardware Acceleration (in options) controls the performance of several features in Revit 2011 including:

• realistic materials in realistic view
• ambient occlusion
• performance of mechanical views
• performance of underlay views
• performance of overall project

To find out if your graphics card supports hardware acceleration, Autodesk has now published a Supported Graphics Hardware List for Revit 2011.

Often Overlooked By Beginners (Part 2)

One of my earliest posts focused on little tools that are often overlooked by beginners. I thought I'd revisit this topic now that I've had more experience working with Revit Beginners. Here are a few more tips that beginners are often not aware of:

1. Wall Location Lines. The location line is kind of an anchor point for a wall. When you flip a wall (ie. change its orientation) the wall will flip about its location line. So if you wanted to flip a wall without affecting its position you could make the wall's centerline its location line as well. Location line is controled in a wall's Instance Properties. Some of your choice settings for the location of the location line include face of core, face of finish, wall centerline, etc. When a wall is selected you might notice two blue dots at either end of the wall. Grab this blue dot and stretch the wall to any length you want. You might also notice that when you change the location line of a wall this blue dot will relocate, reflecting your newly chosen location line.

2. How do I fillet two walls (or lines). A common thing for beginners, is to go right to the trim tool in search of a fillet option (because they are likely more familiar with AutoCAD). Well in Revit the fillet tool is located elsewhere. If you are drawing a wall or a line there is a pallet of line shapes that you can draw (square, polygon, circle, arc, etc.) Well fillet is one of those options circled below.

3. Stretching a gridline in the current view only. When working with gridlines for the first time a beginner will often take notice that stretching the end bubble of a gridline stretches the grid in all views globally. The next question they ask is, "How can I stretch it for this view only?" Well there is a little icon next to a grid bubble that reads "3D." Click on the icon and you'll notice that it now reads "2D." You are now free to strech the gridline for the current view only. The location of the original 3D grid bubble is at the hollow circle you see below.

4. How do I host my railing on a ramp or stair?: Ok, so you've sketch a new ramp or stair and you want to add a railing to it, but the railing is resting on the first floor and doesn't slope with your ramp or stair. Well, when you're in sketch mode shaping your new railing path, there is a tool called "Set Railing Host." Select this tool and then select your host (stair or ramp). Your railing will now slope with the host as was your original intention. Remember, the railing tool is located on the Home tab and is its own sketch. Do not try editing the sketch of your stair or ramp to add new railings. I've seen beginners try this alot.

More beginner tips to come...

Editable Worksets and Workset Ownership

Here is a tip for beginners working with Worksets for the first time.

Let's say you have a project with worksets enabled and the whole model is on Workset 1 by default. If you right click on an element that is on Workset 1 and select the option that reads "Make Worksets Editable" you are making yourself the Owner of Workset 1. No one else is going to be able to edit ANY modeled elements that are on that workset. They can add elements to Workset 1 but they can't edit elements already placed.

If you go to Collaboration... Worksets... and you see yourself as the Owner of any workset you're probably locking everyone else out of that workset so make sure you click on the "Non Editable" button to relenquish the user-created Workset... or do a save to central and relenquish user-created worksets so other users can work on the model too.

What you more likely want to do is borrow... or select the "Make Elements Editable" option instead so you are only borrowing a small part of the worksets rather than Owning the whole workset.

Just a heads up for you beginners out there.

Some New Bloggers on the Block

Steve Swensen is REVIT GUY
Oliver is the author of Revit In Motion
and you can find more interesting reading at revitflow

I look forward to reading your posts guys.

Additive Views vs. Subtractive Views

Common Problem: When I place an electrical fixture or other family category it pops up automatically in other views I would rather not see it in.

Reason: In the default Revit tempate almost every category is unnecessarily turned on in all views so the same family shows up everywhere.

Solution: Create Additive Views instead of Subtractive Views for family categories that are only used in one or two views. By that I mean, start with most family categories turned off in your new view's visibility/graphics and gradually add the categories that you want to see.

Extra Tip: If you want future new views to be additive by default, create a view template. Then, when you apply the template to a view, check the option that reads "Apply automatically to new views of the same type."

BIMtionary

Brandon Pike has started a new blog called BIMtionary. His posts include tiers of BIM Implementation and a Revit Implementation Checklist. I look forward to his future posts.

Phases & Worksets

This blog started out as a blog for beginners. These days I mostly tend to cover advanced topics so here's a little tip for the beginners out there.

Always Be Phase Aware
In every project file your modeled components have a phase created and a phase demolished parameter whether you like it or not. And most views have phase and phase filter parameters. If you place a model component in a view that is set to the New Construction phase (under View Properties), that component automatically gets placed in the New Construction phase. So if you are doing as-builts, make sure you set all of your views phases to Existing. That way when you start placing your components they end up on the correct phase. This can easily be corrected in a 3D view if you skipped this step. As you start to model your proposed design distinguishing between existing and proposed content becomes ever more critical.

Always Be Workset Aware
On workset enabled projects every model component is place on a user defined workset (usually Workset 1). Make sure you check the workset toolbar and select the correct active workset. You don't want to place a whole lot of content on the Shared Levels & Grids workset. This can easily be corrected in a 3D view if you skipped this step.

Instance Parameters: The Double Agent

This is going to be particularly helpful to those of you working on large projects. Some of you may already be aware of it, but I haven't seen it documented anywhere so here goes...

I call this technique the Double Agent because the Instance Parameters discussed here will temporarily act like Type Parameters under the right conditions. Why would I want an Instance Parameter to act like a Type Parameter? you ask. Well, quite often, but not always we want to apply the same Instance Parameter value (like a comment that is repeated for MOST instances of a Family Type) to many of the same Doors, Windows, Sheets, or other families. Comments are typically Instance Parameters that you have to change one at a time. But I don't want to change comments one at a time when there are so many of the same comment value. I want them to update once and simultaniously like a Type Parameter would, without having to use a Type Parameter (because I may still want one or two comment values to remain unique. Well, how do you do it? The Answer: With Schedules

Here is the procedure. Go to your door schedule for example.

You'll notice that I have four door types (71,66,17,64). I need to add the Remark 1hr rated to types 66 & 64. Rather than enter the value one field at a time for the Instance Parameter called Remark, lets add the value to all 8 fields once and simultaniously. Here's how.

Go to View Properties... Sorting Grouping... Now make a mental note (or write it down if you wish) of the current Sorting/Grouping settings because, like a good double agent, you're going to have to restore the schedule to its original identity when we're all done. Now change the setting to what you see below.

You can isolate the From Room: Name (or Type Mark parameter). It is very important to uncheck the Itemize every instance option. This is what you'll see.

Now Type in the Remark 1HR Rated for all doors without a room name... then change the Sorting/Grouping setting back to their original state and You'll have added the Value 1HR Rated to the Instance Parameter Remarks for all doors without a room name.

These are the rules of the game: You have to sort the schedule by some Type Parameter or by some Instance Parameter with equal values already present.

Now that I have the value 1HR RATED for all of the 1HR doors, lets say I want to change the value to 1.5HR RATED. Just isolate the REMARKS parameter from the Sorting/Grouping settings and exchange the old value for the new value.

So once again, why not just make your Instance Parameter a Type Parameter? Because the Instance Parameter value you choose may not always apply to every instance of a Family Type. This is just a custom way to update multiple fields once and simultaniously.

I hope you'll enjoy exploring the many applications of The Double Agent technique.

Imported Images and Sheets

We often import hand renderings into Revit projects for plotting presentation sets.

I've noticed that when I import an image directly onto a sheet that if the image is even slightly outside of the scope of the titleblock then plots can come out centered incorrectly. The only solution is to place images in a drafting view (or legend view) first... then place the view on your sheet. If the view itself is outside of the scope of the titleblock Revit will plot the sheet fine.

Rescaling the image can also be easier from a drafting view once scale is established. Just change the scale of the view. Rescaling the image by eye on a sheet is less accurate.

Legend views can be placed on multiple sheets but placing these images in a legend view can crowd your project browser so I would stick to drafting views unless you absolutely need the added function of placing the image on multiple sheets like for key plans as an example.

If your image comes in solid black it's most likely a memory issue. You can change the resolution and image size to reduce file size if necessary. Rotating images can also cause them to turn solid black.

Images can be imported. Linking an image for easier updating is on the wishlist but is not yet an option.

Feel free to comment on the subject of importing images if you have anything you want to add.