kicad-developers team mailing list archive

[Rene Pöschl <poeschlr@xxxxxxxxx>]

Hi,

just to clarify: the 3d models of the official library must be created 
such that the scaling factor in the footprint is set to 1. We are 
currently rewording the whole section to be clearer 
https://gitlab.com/kicad/services/kicad-website/-/merge_requests/502

On 29/09/2020 18:30, Ian McInerney 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 
> <mailto: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
>     <mailto: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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>     Seth Hillbrand
>     *Lead Developer*
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