Subject:
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Re: On the difficulty of making building instructions
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 9 Feb 2001 08:20:27 GMT
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Highlighted:
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(details)
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In lugnet.cad, Don Heyse wrote:
> > This lead me to lie sleepless most of the night trying to
> > figure out how to solve this problem. So far I have come to the
> > conclusion that our problem is that we attempt to _draw_
> > instead of _build_ - we move the parts around until the drawing
> > looks right, whereas we with the real thing have the benefit of
> > connecting the parts to each other.
I think you've got it just right with this, Jacob.
> Back when I worked in a certain 2D CAD industry we used a simple
> mechanism that allowed the user to propel an object along a 2D vector
> until it hit another object. At that point it would either stop or
> continue moving along a different vector as long as the dot product of
> the new and original vectors was positive. Various options could be
> applied to this motion such as stopping at the first point of contact,
> wiggling a bit for a better fit, or snapping to a grid (think stud
> spacing). Unfortunately I have no idea as yet how to easily generate
> a 3D vector (rather than a 2D vector) to propel a brick along.
> Perhaps with a spaceball instead of a mouse?
One problem with LEGO is that people want to build by "clicking" pieces
into place. Putting two bricks side by side doesn't count as building a
model.
So collision detection is just a first step. But a very important step.
What we really need is a way to mark up the part files with connection
information. Like Koen pointed out, this can be done (somewhat or fairly
well) by using the stud*.dat files as the connection points. But LEGO
pieces can be connected in a fair number of different ways. So maybe we
need special notation for connection points?
In my mind, recording connection information is one big reason to develop a
special LDraw II language, rather than reusing an existing GDL for a new
parts library.
Steve
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Message is in Reply To:
 | | Re: On the difficulty of making building instructions
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| (...) BlockCad (and perhaps other programs) does some collision detection when moving the bricks to assist in the placement. You could enhance this by inventing a mouse that provides some tactile feedback (ala playstation controllers) when the (...) (23 years ago, 7-Feb-01, to lugnet.cad)
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