ImplicitCAD - an interesting alternative to OpenSCAD?

[Jason Lewis]

Hi Guys,

I just came across ImplicitCAD:

https://github.com/colah/ImplicitCAD

It seems to be written in Haskell, and in fact you can generate models
in pure haskell if you like.

Jason

--
Jason Lewis
http://emacstragic.net

[Jason Lewis]

Oh, and you can try it out here:

http://www.implicitcad.org/editor

Jason

[Patrick Barnes]

From a solid modelling background, I must admit I'm not yet swayed by
the likes of openSCAD or implicitCAD. They seem to have more in common
with Pov-ray than any CAD package.

A simple part that I might draw in a CAD program might be built by the
following method:

1. Draw a square on the top plane - extrude into a cube.
2. Draw a rectangle with one tangent arc face on the face of that cube -
extrude as well. (like a wide letter D, for example)
3. Select the lines around the base of the second extrusion, and fillet.
4. Fillet some other lines on the shape at a different radius.
5. Shell the whole thing.

As far as I'm aware, to build something of the same appearance in one of
these 'CAD' systems would require a completely different construction
method, requiring *lots* of CSG differences and etc, and being very
difficult to change later. Even just for 1-4.

If there really was a good text-based CAD program that could be driven
by solid modelling methods, I'd be very excited about it.

-Patrick

[Jason Lewis]

I've done some limited designing in both. The nice thing about OpenSCAD
and friends is they are free.

As you say though, they are much more fiddly to work with. But, given
the programatic nature of them, they an produce highly parameterised
models that can be adjusted very easily.

My main interest though is I want a free and libre tool for designing in.

Jason

[thejollygrimreaper]

the biggest problem openscad has is that a lot of new users seem to think in the same way as they would modelling somthing like blender  to do the cube with a d stuck on it's side would be somthing simple like:

====================

union(){
cube([20,20,20]);
translate([20,10,0])cylinder(r=10,h=20);
}

======================

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[Franc Carter]

On Wed, Feb 13, 2013 at 11:33 PM, Patrick Barnes <mrt...@gmail.com> wrote:

From a solid modelling background, I must admit I'm not yet swayed by the likes of openSCAD or implicitCAD. They seem to have more in common with Pov-ray than any CAD package.

A simple part that I might draw in a CAD program might be built by the following method:

1. Draw a square on the top plane - extrude into a cube.
2. Draw a rectangle with one tangent arc face on the face of that cube - extrude as well. (like a wide letter D, for example)
3. Select the lines around the base of the second extrusion, and fillet.
4. Fillet some other lines on the shape at a different radius.
5. Shell the whole thing.

As far as I'm aware, to build something of the same appearance in one of these 'CAD' systems would require a completely different construction method, requiring *lots* of CSG differences and etc, and being very difficult to change later. Even just for 1-4.

If there really was a good text-based CAD program that could be driven by solid modelling methods, I'd be very excited about it.

I use both Alibre and OpenScad (although Alibre more often), my favourite example of a case where OpenScad is significantly more elegant is doing sphere's

OpenScad:

sphere();

Alibre:

* draw a circle
* run a line through it
* trim either ends of the line and 1/2 the circle
* rotate the semi-circle

cheers

 

-Patrick

On 13/02/2013 4:07 PM, Jason Lewis wrote:

Hi Guys,

I just came across ImplicitCAD:

https://github.com/colah/ImplicitCAD

It seems to be written in Haskell, and in fact you can generate models
in pure haskell if you like.

Jason

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Franc