[OpenSCAD] Fusion360 and OpenSCAD
arnholm at arnholm.org
Sat Oct 8 11:36:47 EDT 2016
On 08. okt. 2016 15:49, Jerry Davis wrote:
> Carsten: Nice work documenting this.
> I had no idea about the nice curving options.
> You seem to know quite a bit about this tool:
> Do you know what the button on the right does (brings up the url and
> file option)? And how to use it?
> How do you add points that you want to be in between two other points
> instead of adding the point at the end?
Well, I had not seen the tool before, I am just able to guess :-) Now I
guessed what the file option is all about: You are supposed to pick up
an image file to use as background for manual sketching.
At first I tried an OpenSCAD source file ... I thought perhaps it could
read a polygon as well as write one, but then it complained that the
file I gave it wasn't an image. That gave me a hint it wanted an image :-)
So I tried the Ford logo image file (.png) and it worked
The window that says "Paths" allows you to define several individual
paths (a.k.a. polygons) in the same sketch, click [New] to start a new
path. To do the Ford logo example manually it means 4 different
- outer contour of the letter "F"
- inner contour of the small loop in the letter "F"
- outer contour of the letters "ord"
- inner contour of the letter "d"
So in theory you could sketch the logo by tracing the image manually,
but it gets complicated/tedious and inaccurate. It is much better to use
an automatic tool when possible. For simpler stuff I guess it could
work, or if the image is not directly suitable for automatic analysis
(some are not).
Apparently, there is no way to use the GUI to add points in between to
other points, or at least I could not figure it out. You can always
insert the extra point by typing in the correct place in the tiny
"OpenSCAD code" window, then the curve will be updated correctly.
However, this to some degree defeats the purpose of the tool, because
you are then back to editing the source directly, just in a much smaller
window than usual....
I also tried pasting polygon code from OpenSCAD into the code window,
but that failed when the coordinates were outside the window range, the
polygon builder does not fit the coordinates automatically, and it does
not understand scale() or other transformations. It just not usable for
too large or too small coordinates. It also turns out that the
definition of "too small" and "too large" is unclear, I opened the
polygon builder in Firefox on both Windows7 and Kubuntu 15.10, for some
reason the x-range is [-72,72] on Kubuntu and [-88,88] on Win7, so when
I copied a polygon from polygon builder from Win7 to Kubuntu, parts of
the polygon were hidden under the toolbox and I could not reach it.
It is a nice idea, but with clear limitations.
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