kicad-developers team mailing list archive

["Kliment (Future Bits)" <kliment@xxxxxxxx>]

I'd find it a loss if the scaling options were gone - I often end up
using scaling for things like inductors, where there's too much variety
to make a model for each size and height, so I'll often grab a model
with the correct fp and wrong height and scale it.

Kliment

On 29.09.20 19:38, Ian McInerney wrote:
> I am all for removing scaling completely on STEP models - those should
> be properly defined. I'm not sure the history of why VRML was chosen as
> the first model type that was supported, but we shouldn't remove it
> since it is used primarily in the 3D viewer to get better renders.
> 
> We can probably go down to 1 scaling input for VRML models, but why not
> just turn it into a "VRML Units" selection and provide a list of the
> common units and compute the scaling factor from that? That should be
> the only use case when scaling VRML is needed.
> 
> -Ian
> 
> On Tue, Sep 29, 2020 at 6:22 PM Jon Evans <jon@xxxxxxxxxxxxx
> <mailto:jon@xxxxxxxxxxxxx>> wrote:
> 
>     Do other EDA tools allow model scaling?  Altium doesn't even allow
>     VRML import in the first place.
> 
>     On Tue, Sep 29, 2020 at 1:10 PM Seth Hillbrand <seth@xxxxxxxxxxxxx
>     <mailto:seth@xxxxxxxxxxxxx>> wrote:
> 
>         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 <mailto: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 <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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>         KiCad Services Corporation Logo
>         Seth Hillbrand
>         *Lead Developer*
>         +1-530-302-5483‬ <tel:+12126039372>
>         Davis, CA
>         www.kipro-pcb.com <https://www.kipro-pcb.com/>   
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