The question then becomes, how do we want to do this. Should we remove the (scale ) s-expr from newly saved footprints and replace it with a units one? Or do we make this a UI-only change and have the UI compute the scaling factors that are saved in the file.
-Ian On Tue, Sep 29, 2020 at 7:02 PM Seth Hillbrand <s...@kipro-pcb.com> wrote: > I've never seen another package use VRML. Everyone uses STEP. I suspect > if we were implementing this today, we would look at the tradeoff on > support/benefit for VRML and limit ourselves to STEP as well. > > I like Ian's suggestion for unit options. > > -Seth > > On Tue, Sep 29, 2020 at 10:22 AM Jon Evans <j...@craftyjon.com> 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 <s...@kipro-pcb.com> >> 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.mciner...@ieee.org> >>> 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 <s...@kipro-pcb.com> >>>> 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 <mrluze...@ua.pt> 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 >>>>>> _______________________________________________ >>>>>> Mailing list: https://launchpad.net/~kicad-developers >>>>>> Post to : kicad-developers@lists.launchpad.net >>>>>> Unsubscribe : https://launchpad.net/~kicad-developers >>>>>> More help : https://help.launchpad.net/ListHelp >>>>>> >>>>> >>>>> >>>>> -- >>>>> [image: KiCad Services Corporation Logo] >>>>> Seth Hillbrand >>>>> *Lead Developer* >>>>> +1-530-302-5483 <+12126039372> >>>>> Davis, CA >>>>> www.kipro-pcb.com i...@kipro-pcb.com >>>>> _______________________________________________ >>>>> Mailing list: https://launchpad.net/~kicad-developers >>>>> Post to : kicad-developers@lists.launchpad.net >>>>> Unsubscribe : https://launchpad.net/~kicad-developers >>>>> More help : https://help.launchpad.net/ListHelp >>>>> >>>> >>> >>> -- >>> [image: KiCad Services Corporation Logo] >>> Seth Hillbrand >>> *Lead Developer* >>> +1-530-302-5483 <+12126039372> >>> Davis, CA >>> www.kipro-pcb.com i...@kipro-pcb.com >>> _______________________________________________ >>> Mailing list: https://launchpad.net/~kicad-developers >>> Post to : kicad-developers@lists.launchpad.net >>> Unsubscribe : https://launchpad.net/~kicad-developers >>> More help : https://help.launchpad.net/ListHelp >>> >> > > -- > [image: KiCad Services Corporation Logo] > Seth Hillbrand > *Lead Developer* > +1-530-302-5483 <+12126039372> > Davis, CA > www.kipro-pcb.com i...@kipro-pcb.com >
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