kicad-developers team mailing list archive

[Seth Hillbrand <seth@xxxxxxxxxxxxx>]

Well, we've backed ourselves into a bit of a corner.  VRML is specified in
meters, so if we're assuming inches, we're a bit off in left field.  But do
we need three separate scale parameters?  We could reduce to 1, correct?

In the official footprint library, we have 7 footprints that specify
non-unity scaling. (Banana_Jack_[1-3], NS-Tech_Grove_1x04, Fuse_Blade_ATO,
Fuse_Blad_Mini, Oscillator_SMD_TXC0_G158).

-Seth




On Tue, Sep 29, 2020 at 9:30 AM Ian McInerney <Ian.S.McInerney@xxxxxxxx>
wrote:

> We can't remove the scaling option until we make the VRML importer handle
> proper unit selection. I have routinely run into the case where I go
> OpenSCAD -> Wings3D -> KiCad and design a model using mm in OpenSCAD
> because it makes for easier computations (all the datasheet values are
> nicely given in mm) and then have to apply a scaling factor of 0.3937 to
> all the axes in KiCad to make it the proper size because we seem to have a
> hardcoded assumption about what unit system the VRML file is in.
>
> In fact, the KLC says: WRL files do not specify absolute dimensions. KiCad
> normalizes model parameters to units of inches and the internal units
> (dimensionless) of the WRL model must be scaled accordingly.
>
> -Ian
>
> On Tue, Sep 29, 2020 at 4:50 PM Seth Hillbrand <seth@xxxxxxxxxxxxx> wrote:
>
>> There has been some discussion to removing the scale option here
>> altogether.  The logic being that if you need the model scaled, you should
>> be doing this in your solid CAD not in your electronic CAD.  I have come
>> around to this idea and it might be worth implementing rather than doing
>> the scale limiting.
>>
>> -Seth
>>
>> On Tue, Sep 29, 2020 at 4:52 AM Mário Luzeiro <mrluzeiro@xxxxx> wrote:
>>
>>> Hi all,
>>>
>>> I'm wondering if it is safe to limit the scale of shapes to be positive
>>> values?
>>>
>>> Applying negative scales will cause inverted shapes and render issues on
>>> the models.
>>>
>>> Could be that anyone in the world is using negative scale values?
>>> or should be safe to limit it?
>>>
>>> This is related with this issues:
>>> https://gitlab.com/kicad/code/kicad/-/issues/5817
>>>
>>> Mario
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>>
>>
>> --
>> [image: KiCad Services Corporation Logo]
>> Seth Hillbrand
>> *Lead Developer*
>> +1-530-302-5483‬ <+12126039372>
>> Davis, CA
>> www.kipro-pcb.com    info@xxxxxxxxxxxxx
>> _______________________________________________
>> Mailing list: https://launchpad.net/~kicad-developers
>> Post to     : kicad-developers@xxxxxxxxxxxxxxxxxxx
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>>
>

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