Text Note - baseDirection Weird Number

[Julian.Wandzilak]

I was playing recently with text notes and was rotating them a little bit. One thing I need some help with/clarification. 

BaseDirection - Revit Lookup shows values between -1 and 1. I was hoping to use it to make sure that text notes are horizontal or vertical. The thing is that it didn't worked. 

So please find below the printscreent:

To achieve it I manually rotated the textNote 90 degree with its handle - Lookup is showing correctly 0, 1, 0 - but when I collected it and check it with my code I end up with this weird number which is visible on the form. 

TaskDialog.Show("TEST", $"TEXT NOTE ID: {textNote.Id} \n BASE DIRECTION X : {textNote.BaseDirection.X} \n, BASE DIRECTION Y : {textNote.BaseDirection.Y} \n  BASE DIRECTION Z : {textNote.BaseDirection.Z} \n ");

[jeremy_tammik · Accepted solution]

Dear Julian, 

There is nothing strange about that at all.

On a digital computer working with real numbers represented as doubles or floats, 

2.77555756156289E-17 is exactly the same thing as 0.0.

Please read up on precision and the need for fuzz:

• https://thebuildingcoder.typepad.com/blog/2023/03/uv-emergence-fuzz-and-the-get_-prefix.html#4

[Julian.Wandzilak]

Thanks! Sometimes I need someone to point to me things which should be obvious 😉

[jeremy_tammik]

Me too! Happy weekend.