kicad-developers team mailing list archive

[Ian McInerney <Ian.S.McInerney@xxxxxxxx>]

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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>
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> Seth Hillbrand
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