Thread: Scale Parameter for 2D Lines

Hello,

I'm trying to create a simple tree family without any render images, only model lines displayed in elevation, 3d view and plan view. Just like the standard trees, people families in Revit when viewed in hidden lines view.
I want to create a family that has a parameter that controls the actual height of the tree (the 2d lines), just like the parameter that the Revit standard families have, but I can't figure out how they have created that parameter.

What would be the best way to create a family like that?

/Philip

You have to use.... MATH

Ok... The family you send is not what I'm trying to do. Do you mean that I need to create parameters for every line creating the tree shape to be contro11ed by one single parameter: the height parameter?
If so I have a problem because I'm using spline lines to create my 2d drawing.
A solution that I would think of is if there is some way to create a scale parameter. What do you think?

You could do something like this. It's not a perfect idea, but if you just need something to show in 2D...

Just a note, I can only get this to work with linework. Extrusions or masking regions don't scale quite the same way that I can find, so you'd have to either make a whole bunch of types and use visibility parameters to control extrusions or something.

Back in the day... scale was called XP value in the land of CAD. If you would look carefully at my family I posted you will see that I do in fact have a "scale" parameter called "Scale Factor". As far as Revit can do scale at least. I've made a 2nd version that gives an actual "Length" input for the scaling of the line work. Since the OP said Revit 2013 I attached a 2013 version to this thread, my previous version was a 2012 version. The value of this parameter would need to be manually adjusted to match the view scale. This is the only way Revit can preforming view based scaling. It sucks but its the best we got.
In regards to your spline problems. You are able to attach the nodes of the spline to reference planes and control those reference planes with dimensions. Ive make a short video to explain this.
See it here: 2013-01-31_0812 - Alex_Cunningham's library

Hope this helps.