One thing you will find, you can not draw a line in a family (rfa) file less than 0.8mm. For logos and symbols this can be big problem so here are some work-arounds:
If you just want to use lines, draw them 10 times the size they need to be. When finished, select the lines and use the Resize command to reduce them by point 1 (0.1).
For some reason, the same trick does not work when scaling with-in the sketch mode of filled regions. When you resize it is likely you will get the following messag:
So how do you create solid items that require a line less than 0.8mm. Using an imported image unfortunately won’t work. When you bring it into the project file it scales totally incorrectly.
Surprisingly the solution is dwg (AutoCAD format). Open up a drafting view in Revit. Use a filled region to create the logo / symbol 10 times the required size. Use invisible lines around the parameter. On finishing it, export the view as a dwg (AutoCAD) file. Now open up the Generic Annotation template file.
Import the dwg file, and use the resize tool to reduce it by point 1 (0.1).
Save the symbol and import and place it into a blank project file. Now go to Settings > Object Styles and go to the imported objects tab. Select the individual AutoCAD layers and delete them individually.
Now go to the Revit project browser, and navigate to families > Annotation Symbols. Right click on your symbol family and click save. Save this out to your Revit Library. This symbol now will work not perfectly when inserted into your project without any of the AutoCAD visibility headaches.
Additional note added 30 July 08
Colour in your Symbols
In the event you want colour in the symbols you will need to leave the old AutoCAD layers in the family. When you delete an AutoCAD layer it bumps the items on to the default Revit imported object layer which is black. So in the case of using colours you, can just leave the AutoCAD layers in the family. It will mean that you have the possible problem of the imported objects being turned off accidentally. It’s definitely not ideal by any means.
If you can get away with back and white go with that first. If you have to use colour, first see if you can draw it in the Generic Annotation Family using the Revit fill region. If all that fails you will need to bring it in from AutoCAD and leave the associated layers there.
In regard to the AutoCAD layers, if you need to export your finished drawing back to AutoCAD for consultants, and you want to make sure your generic annotation symbols export correctly, put the different colours on different layers. Alternatively in the export options for “Layers and properties” change it to “Category properties BYLAYER, overrides BYENTITY” or “All properties BYLAYER, new layers for overrides.”
Thanks for the questions.