Filter by blockrotation has not the right angle

[thomas_schluesselberger]

Hey guys!

I found a strange behavior of the filter command when I want to filter by block rotation.

The following situation:
In a drawing, a block exists several times, but with different block rotations (0, 90, 180, 270 degrees).
I want to use the filter command to mark only the blocks that have 90 degrees.
If I enter 90 degrees under block rotation in the filter, however, no blocks are marked.

When I use the "add selected object" function of the filter command, "1.570800" is inserted ​​under block rotation.

Why is that? The block also has a value of 90 degrees in its properties.

It's not the biggest problem because I can use "add selected object", but I don't understand how it happens and it's annoying to select a block every time.

Has anyone else noticed this strange behavior and is there an explanation for it?

[tramber]

The explanation is easy to me, reading you, being a user of FILTER : in the core of the dwg, all is in radians. 1.570800 is the half of PI (3.14), i.e. 90°.

FILTER create some lisp code in the filter.nfl file, have a look if you are curious to know how it is done if you recoreded some named filters

In filter, you need to specify radians ? The answer appears to be YES.

[thomas_schluesselberger]

OK, that's an explanation.

Very strange and impractical that you can't just enter the angles in degrees.
With qselect you can just enter degrees, which seems more logical 🤷‍

[tramber · Accepted solution]

It is the explanation : FILTER is made for engineers 😃 and QSELECT for ordinary people (I make jokes but not very confident, as English is not my native language at all !)....

(I am engineer and a lisper...)

FILTER is an older command than Qselect, according to me. It is powerfull but it speaks "code" not conventional degrees... In pure Maths, we use radians, I know it from my studies...

Degrees were just made in 360° for it to be dividable by many numbers...

2xPi was made to make it easy to calculate the angle by the radius.

because of 2piR !

ang (in radians) x radius = arc length

This is the reason of that use.

I had a look to see what to enter in the angle field such as some lisp and to tell you but it doesn't work, off course.