i can't put x,y axes on the origin of the design.

[Tristus]

Try this way.
I prefer to grab the bird icon and carry it where I care, turning it if it's the case.

In practice you have to bring the origin of the axes where you want. It's very simple. If you want to go back to the starting bird, all you have to do is make a global ucs.
when in the video click on the icon "show ucs at the origin" autocad assigns the value 3 to the ucsicon variable, as explained previously

 

[Alex97]

following the directions of tristan and I managed to move the axes. Thank you.

 

[Alex97]

I followed the directions of tristan and managed to move the axes. Thank you.

 

[Tristus]

it would be interesting to know whether to move the geometry or move the origin of the axes produce the same result.
It is clear that yes, at least in theory, because we with both procedures are assigning to a certain point the coordinates 0.0.0.

I mean... will the software used by alex97 draw our own conclusions, or will it distinguish between the global autocad ucs and the moved icon?
should not make distinctions, but software often do the bizze.

I ask alex97 the courtesy to do the two tests (one moving the geometries and the other moving the origin of the uct) and see how the software for energy certification reacts (if the operation is not too honest, thank you).
experiment is very important.

 

[Alex97]

What do you mean to move geometries? I mean, how are we going?

 

[Tristus]

by geometry is the set of entities that make up a design (lines, circles, arches, texts, quotas etc.)
For example, in the video that you previously posted the operator moves the geometry (in this case the cartouche, but could have been a plant) positioning it on the coordinates 0.0.0.

so you have 2 possibilities, or move the geometry to 0.0.0... or leave it where it is and move the bird to geometry instead.
you get the same result, in theory the energy certification program should not have difficulty in processing dwg created with these 2 methods, but it was right to experiment. Sometimes it's just a grandma to confuse the programs.

 

[Cristallo]

it would be interesting to know whether to move the geometry or move the origin of the axes produce the same result.
It is clear that yes, at least in theory, because we with both procedures are assigning to a certain point the coordinates 0.0.0.

I mean... will the software used by alex97 draw our own conclusions, or will it distinguish between the global autocad ucs and the moved icon?
should not make distinctions, but software often do the bizze.

I ask alex97 the courtesy to do the two tests (one moving the geometries and the other moving the origin of the uct) and see how the software for energy certification reacts (if the operation is not too honest, thank you).
experiment is very important.

a local ucs (i.e. displacement of aces) always makes a difference in autocad.
is transparent to the user (for autocad takes care of the real-time transposition) but the software always reasons with the global uct.
I believe the same behavior is used by third-party softs; lisp procedures are almost 100%.
other local bird handicap (but the coordinate system in general) is the distance from the wcs (i.e. from the ucs world).
because finite length numbers are used to represent the coordinates, when this coordinates have a very large whole part (then distance from the zero of the global uct), fewer digits available for decimals remain, and therefore precision begins to suffer, with small, sometimes almost imperceptible errors.
but who has a minimum of knowledge of error theory, he has well known that working mathematically on "imprecise" numbers does nothing but increase the inaccuracy.
so maybe you move the ucs to the coordinates 100k,100k and all row smooth, until you notice that the mirror of a series of entities does not fit perfectly with another, that extends an entity but imperceptibly does not touch the other entity or exceeds a peline.. .

dispassionate advice is always to move entities close to global zero (move -> _all -> point of displacement -> 0.0.0).
quick operation almost as much as shifting the ucts, but gains in precision,

 

[Tristus]

Thank you. crystal glass for the clear and exhaustive explanation.
you have clarified a concept that escaped me, because the difference between a global ucs and a ucs placed away from what autocad considers "global". the first thing one thinks of is "why do they recommend me to draw very close to the global uct, if then can I decide where to start the origin of the axes? one origin is worth the other".

the software does not contemplate the infinite (the infinite is only in our head) for which they will have at their disposal a good number of decimals after the whole part (of course very large) but cannot go beyond ... and as you have well explained, the more 'the whole number is great (i.e. greater distance from the global ucts) and the more 'absottiglia the space in memory to devote to the decimals.