Empathy List Archives

Q

QuackingPlums

Tue, Feb 24, 2015 2:57 PM

Is there an undocumented parameter to either of these transformation
functions that allows me to retain the aspect ratio of the child node?

Example: if I use surface() to create a texture map from a PNG, is there a
way to resize the output to fit within a specified boundary without
affecting the aspect ratio?

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Is there an undocumented parameter to either of these transformation functions that allows me to retain the aspect ratio of the child node? Example: if I use surface() to create a texture map from a PNG, is there a way to resize the output to fit within a specified boundary without affecting the aspect ratio? -- View this message in context: http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744.html Sent from the OpenSCAD mailing list archive at Nabble.com.

TP

Torsten Paul

Tue, Feb 24, 2015 3:37 PM

Is there an undocumented parameter to either of these transformation
functions that allows me to retain the aspect ratio of the child node?

No, but resize() has a documented parameter :-))

http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#resize

"If the 'auto' parameter is set to true, it will auto-scale any 0-dimensions to match."

That only catches the case where you know which of the dimension is
the leading one. So what's not working (as far as I know) is to say:

"fit into a cuboid of size xyz and scale such that it maximizes the volume inside"

Scale() can't have a separate parameter as it has factors as values, so
if it should retain aspect ratio, it simply needs the same value.

ciao,
Torsten.

> Is there an undocumented parameter to either of these transformation > functions that allows me to retain the aspect ratio of the child node? > No, but resize() has a documented parameter :-)) http://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#resize "If the 'auto' parameter is set to true, it will auto-scale any 0-dimensions to match." That only catches the case where you know which of the dimension is the leading one. So what's not working (as far as I know) is to say: "fit into a cuboid of size xyz and scale such that it maximizes the volume inside" Scale() can't have a separate parameter as it has factors as values, so if it should retain aspect ratio, it simply needs the same value. ciao, Torsten.

PF

Peter Falke

Tue, Feb 24, 2015 4:02 PM

No, says math: either aspect ratio and a 1-dim boundary, or two-dim
boundary.

2015-02-24 15:57 GMT+01:00 QuackingPlums quackingplums@hotmail.com:

Is there an undocumented parameter to either of these transformation
functions that allows me to retain the aspect ratio of the child node?

Example: if I use surface() to create a texture map from a PNG, is there a
way to resize the output to fit within a specified boundary without
affecting the aspect ratio?

--
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http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

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No, says math: either aspect ratio and a 1-dim boundary, or two-dim boundary. 2015-02-24 15:57 GMT+01:00 QuackingPlums <quackingplums@hotmail.com>: > Is there an undocumented parameter to either of these transformation > functions that allows me to retain the aspect ratio of the child node? > > Example: if I use surface() to create a texture map from a PNG, is there a > way to resize the output to fit within a specified boundary without > affecting the aspect ratio? > > > > -- > View this message in context: > http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > -- stempeldergeschichte@googlemail.com <karsten@rohrbach.de> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu schreiben. Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. P.S. In case my e-mail is shorter than you enjoy: I am currently trying short replies instead of no replies at all. Please let me know, if you like to read more. Enjoy!

Q

QuackingPlums

Wed, Feb 25, 2015 10:59 AM

Thanks for your reply. The auto parameter works as long as the imported PNG
is in a known orientation as you say, but I was hoping I could do something
for a totally generic solution.

Am I correct that there are no functions that can return the dimensions of
an imported PNG file?

--
View this message in context: http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744p11759.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

Thanks for your reply. The auto parameter works as long as the imported PNG is in a known orientation as you say, but I was hoping I could do something for a totally generic solution. Am I correct that there are no functions that can return the dimensions of an imported PNG file? -- View this message in context: http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744p11759.html Sent from the OpenSCAD mailing list archive at Nabble.com.

M

MichaelAtOz

Wed, Feb 25, 2015 1:34 PM

Yes,

for a dxf there is

https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/General#Getting_input

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View this message in context: http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744p11760.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

Yes, for a dxf there is https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/General#Getting_input ----- Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ -- View this message in context: http://forum.openscad.org/Retain-aspect-ratio-when-using-scale-or-resize-tp11744p11760.html Sent from the OpenSCAD mailing list archive at Nabble.com.

MK

Marius Kintel

Wed, Feb 25, 2015 4:39 PM

On Feb 25, 2015, at 05:59 AM, QuackingPlums quackingplums@hotmail.com wrote:

Am I correct that there are no functions that can return the dimensions of
an imported PNG file?

It feels like resize() should be extended to have options for specifying a maximum bounding box and preserve aspect ratio.

-Marius

On Feb 25, 2015, at 05:59 AM, QuackingPlums <quackingplums@hotmail.com> wrote: > Am I correct that there are no functions that can return the dimensions of > an imported PNG file? > It feels like resize() should be extended to have options for specifying a maximum bounding box and preserve aspect ratio. -Marius

TP

Torsten Paul

Wed, Feb 25, 2015 5:44 PM

Von: "Marius Kintel" marius@kintel.net

Am I correct that there are no functions that can return the dimensions of
an imported PNG file?

It feels like resize() should be extended to have options for specifying a maximum bounding box and preserve aspect ratio.

And maybe also have some kind of position() thingy too to go along with that? I guess both together should cover most use-cases to fit unknown/extern model parts into some scad design (e.g. STL, DXF, text(), ...).

ciao,
Torsten.

> Von: "Marius Kintel" <marius@kintel.net> > > Am I correct that there are no functions that can return the dimensions of > > an imported PNG file? > > > It feels like resize() should be extended to have options for specifying a maximum bounding box and preserve aspect ratio. > And maybe also have some kind of position() thingy too to go along with that? I guess both together should cover most use-cases to fit unknown/extern model parts into some scad design (e.g. STL, DXF, text(), ...). ciao, Torsten.

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Retain aspect ratio when using scale() or resize()?

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