Tuesday, August 26, 2008

Object and Line Style Settings

Object styles and Line styles are the foundation to making Revit printed output readable as well as making Revit NCS compliant. Within Line styles there are four settings that define the line styles, Line name, Line Width, Line Color, and Line Pattern.Within Object styles there are the same four settings of Object name, Line Width, Line Color, Line Pattern, plus the added setting of Material.

Line Width
The NCS calls for 9 different line weights, while Revit has the ability to assign 16 different line weights.The definition of these 16 line weights are defined by inches or millimeters depending on the Project Units. The default line weights that Revit defines for the first 9 line widths are close to what NCS defines, but are exact, so these scales will have to be adjusted.
Line Patterns
The NCS call out multiple types of line patterns, some of these line patterns are very precise, and some are still ambiguous. When comes down to the ambiguous NCS line patterns what Revit has coming straight out the box is sufficient. Some of these Line Patterns look similar enough to work. The line patterns that the NCS is precise in their size are not part of the line patterns that come with Revit so you will need to add them to the list of line patterns. To add a line pattern is really easy. Click the New button in the Line Pattern dialogue box. In the Line Pattern Properties dialogue box you should first name your new line pattern. Next you will notice that the dialogue box has two fields for input. The first field it the type field, this is where you decide if the line segment is a dash, a dot or a space. The second field is the value field, in this field you decide the length of your dash or space.
Line Color
In Revit you can define the line color by any RGB or Pantone configuration. In the plotting guidelines of the NCS the NCS 4.0 defines 255 colors to be used in the RGB format.



Material
Taking about materials is actually opening a can of worms. The Materials setting is actually one of the most data rich settings of Revit. Defining the Materials settings is what begins to make Revit a Building Information Model. Within Materials you can assign Keynotes, you can assign cost, you can assign rendered materials, there is just so much you can assign to materials but for the sake of NCS I’m just going to talk about the Surface and Cut patterns you can assign to a material. In assigning Surface and Cut patterns to a material you are assigning a 2d hatch pattern or poche to a material which Revit calls fill patterns. Matching NCS fill patterns are pretty easy since NCS does not have specific definitions of what the fill patterns are. A lot of the fill patterns that come standard from Revit look similar to what is in the NCS and are useable. Simplistic fill patterns can be made directly within Revit. These are net fill patterns and parallel line fill patterns. The more complicated ones can be created just like you would create a hatch pattern in Autocad. Once created these more complex fill patterns can be imported into Revit 2 ways. The first is you start to create a new pattern from scratch and in the new fill pattern dialogue box click the custom radio button, then the import button.

When defining fill patterns you need to be aware of four definitions of fill patterns. The first two definitions define if the fill pattern is a drafting or model fill pattern. The difference between these two types of patterns is that drafting patterns are static patterns and dynamic. If you are attaching a fill pattern to the surface of an object style you should use a model pattern type. As an example if you have a 2x4 acoustical ceiling and the surface property has a model pattern you can adjust the ceiling grid. Drafting patterns should be used in drafting views or in cut property of the object style. The next two properties of fill patterns are where you decide if the pattern is transparent or opaque. This is self explanatory, but if you want the fill pattern to hide whatever is behind it you use a opaque fill pattern and if you want to see what’s behind the fill pattern you use a transparent pattern.

1 comment:

Anonymous said...

i believe that if you want to create a very fine dashed line, you are relegated to lines no less than 1/32", which won't get you far if you need very short lines indicated as dashed.