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Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
 
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Hello, the Constructive Library (about 1900 lines of Code) i just have released https://github.com/solidboredom/constructive, takes a different approach to OpenScad Syntax: you rarely need difference(), for(), intersection() or their one-to-one equivalents, a for() block In the library's own dialect might look like: pieces(4) X(every(35)) turnXY(vals(10,25,-15,40)) cube(10); It is all valid OpenScad, you do need any additional programs,
just the OpenScad and the constructive-compiled.scad file. The Constuctive-Syntax tries to align more with mechanical
construction of parts and less with mathematical concepts like
arrays, vectors and functions. (but they are heavily used behind
the scenes). So it aims to be more concise and fluent for
mechanical parts than vanilla OpenScad. It allows you to make
holes from Modules and really good deal more. If somebody likes the Ideas, you are welcome to join work on it. It is released under GPL2, and I appreciate additions/discussions/collaboration. Perhaps, some Ideas can be used by the OpenScad itself. There is barely any documentation yet. I will add it topic-wise,
when any questions arise if there will be interest at all. For a basic introduction to its syntax and some possibilities, look at the explanations inside the example below, or ask me directly. Here is an example with approx 100 lines of actual code (see also an animated .GIF in the Attachment): https://github.com/solidboredom/constructive/blob/main/examples/mount-demo.scad
there is also another Example at: https://github.com/solidboredom/constructive/blob/main/examples/pulley-demo.scad 
There are many more features useful for complex models, like its own minimalistic type-subsystem, basic inheritance of construction parts (still needs improvement), or inverse transformations like in : g(X(10),Y(15),turnXY(45),X(30)) g(backwards([X(10),Y(15),turnXY(45),X(30)]) box(10); Try it! i hope you will find it as useful as i do. Peter
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mount.gif (722K)
Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Peter: I took a quick look at the mount demo. It is interesting, but also overwhelming. A step-by-step tutorial, that adds new features and concepts one-at-a-time might be easier for me to digest. Perhaps others will find it easier than I do. You've been sitting with it for years, so it is all familiar to you. I am impressed by your creativity and determination. Jon
On 6/6/2021 7:45 AM, [hidden email]
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Is it a bug in Openscad?
I have tried it now with 2021.01 (git
41f58fe) (Appimage build) and it works without any warnings on my
UBUNTU 20.04.
what OS are you on?
The only other thing which comes to my
mind: could it be a possible character encoding issue when using
Windows vs Linux?
IMHO this could occur if one downloads
library files from Github individually or by copy pasting, instead
of downloading them all at once as a zip.
I have attached a screenshot of how to
do download as zip from Github.
You will probably not need it, but i
find Github pages very confusing personally, so perhaps it will
help somebody anyway.
could you send me the errors/warnings
output you get?
and if possible try with a different,
but recent openscad version from
https://openscad.org/downloads.html
they only have a fairly recent ones on
the download page, so i would expect them all to work
this would help me a lot a lot to
locate the cause.
Peter
On 07.06.21 12:05, [hidden email]
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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In reply to this post by jon_bondy
Jon, thanks for the nice words,
yes, you are right, i just did not want
to spend much time on the documentation/tutorials first,just to
see how nobody would be really interested. this kind of happened
before to me.
the library itself i use myself a lot,
so the effort spent on it helps me in my other projects, but the
tutorials i did not need pesonally, so far.
But now the reception is hopefully
positive there is will be a reason for it.
i just hope there will be enough
interest in the community
Peter
On 07.06.21 01:49, jon wrote:
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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In reply to this post by jon_bondy
It is a little of a feedback loop. More tutorials make it more accessible which means more people use it. But I do understand the challenge of writing the tutorials. If you look at the BOSL 2 library, a STUNNING amount of work has been done, not just on the library itself, but on documentation that makes it easy to use. I find an example and then nudge it until it does what I want. Good luck! Jon On 6/7/2021 9:00 AM, petka wrote:
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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In reply to this post by jon_bondy
I will definitely make step by step
simple examples to make up a tutorial soon
I must admit until now,i had only heard
somewhere of BOSL 2. Having looked around longer time ago and then
finding nothing of much help to me, i had concentrated on my own
library which went through several iterations of syntax change.
this was out of a need: i build
complex parts.
with vanilla openscad i get lost in
extremely nested and repetitive code of any complex model very
quickly.
an own module for almost everything,
to avoid code duplication, did not really help. It made my code
even more semantically scattered and dissociated.
so i started to fight nesting and singularities in OpenScad, the difference() was an obvious target having both ( it treats its first child differently from all other children, which i call singularity, which makes you structure your code after difference()'s personal preferences, and not after your construction intent) so i have created the SummUp library (still on my Github) . an on and on to reduce not semantically relevant code nestng even more... I had assumed other libraries out there
are mostly "boxes with a bunch of customized stuff you can find
use for". a bit like going to a flea market and looking for an old
lamp you will reapair, versus creating your own new lampshade,
lamppost, etc.
There was a library for relative
coordinates somewhere, which i found interesting, but it was too
complex to use for me, it asked for 3D vectors and alike in daily
use, so i never really dug it.
Looking at the BOSL2 now , this thing
seems different, the examples in the readme.md go a path of trying
to align the language to the domain.
Actually, i even used to have up()
(now Z() or XYZ()) and skewedBox() in a previous iteration of my
library, which is called "humane.scad" and focused on easy human
readability.
and there is also the xcopies(dist,n)
which is similar to pieces(n)X(every(dist)) in the Constructive
dialect.
there are definitely a lot of
similarities. It is a pity i did not notice it well enough,
before.
Perhaps the two can be integrated. I wiil have to look deeper, but perhaps the Constructive has taken the syntactic departure from mathematical notation even further, introducing assemble(), add() remove()
and the notion of "Parts" (semantically orthogonal to modules,
which i consider more an aspect of a Part or of several Parts)
I had also changed the preferred style
from openscads native module nesting to sets of functions in
parameters, like in
g(X(10), turnXY(30), TOUP()) cube(10);
versus
X(10) turnXY(30) TOUP() cube(10);
which are both valid in Constructive,
but the first is preferred for performance reasons, among other
features i brings.
On 07.06.21 16:28, jon wrote:
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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In reply to this post by LenStruttmann
Found it:
In Preferences -> Advanced -> OpenSCAD Language Features ...I had both of these checked.  Since you routinely pass h=0 to cylinder(), my OpenSCAD complained loudly. Sent from the OpenSCAD mailing list archive at Nabble.com. _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to [hidden email] |
Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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In reply to this post by LenStruttmann
Thanks len!
i will need to address it, it uses
cylinder(h=0) to reduce CSG nesting (avoiding an If()-block) with
older openscad versions this had significant speed improvemnts,
had not checked if this changed, yet.
On 07.06.21 18:12, LenStruttmann wrote:
Found it:
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Re: Constructive Syntax Library for Openscad: no difference(), no for(), no intersection() used
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