kicad-developers team mailing list archive

[Seth Hillbrand <seth@xxxxxxxxxxxxx>]

I don't follow your statement.  The standard says "ISO/IEC 14772 defines
the unit of measure of the world coordinate system to be metres."  There is
no ambiguity here, so I would feel comfortable with saying that KiCad also
defines the VRML standard unit to be meters (metres).

As to the file savings, this is easily addressed by defining a single, new
coordinate system in inches or microns that scales the global system.  All
units in the file are then in scaled coordinates.

-Seth

On Tue, Sep 29, 2020 at 3:50 PM Cirilo Bernardo <cirilo.bernardo@xxxxxxxxx>
wrote:

> That's the same reference - the problem is with the wording 'is', not
> 'shall' or 'must be'.
> The reality is that for every tool you pick that generates VRML models,
> the unit used is
> anyone's guess.  On top of that, for KiCad's purposes using meters would
> actually
> be a nuisance and would unnecessarily bloat the VRML file. Many parts
> often have
> features on the order of 10 microns; using mm or even 0.1 inches shaves
> off a lot of
> zeroes (or repetitive exponents).
>
> Cirilo
>
>
> On Wed, Sep 30, 2020 at 7:40 AM Seth Hillbrand <seth@xxxxxxxxxxxxx> wrote:
>
>>
>>
>> On Tue, Sep 29, 2020 at 2:33 PM Cirilo Bernardo <
>> cirilo.bernardo@xxxxxxxxx> wrote:
>>
>>> Oh, I wish VRML specified meters - that would have made life much
>>> easier.
>>>
>>
>> See
>> https://www.web3d.org/documents/specifications/14772/V2.0/part1/concepts.html#4.4.5
>> This reads pretty clear to me.  Was there a different reference you are
>> referring to?
>>
>> -Seth
>>
>> --
>> [image: KiCad Services Corporation Logo]
>> Seth Hillbrand
>> *Lead Developer*
>> +1-530-302-5483‬ <+12126039372>
>> Davis, CA
>> www.kipro-pcb.com    info@xxxxxxxxxxxxx
>>
>

-- 
[image: KiCad Services Corporation Logo]
Seth Hillbrand
*Lead Developer*
+1-530-302-5483‬ <+12126039372>
Davis, CA
www.kipro-pcb.com    info@xxxxxxxxxxxxx