Subject:
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Re: on Collision, stop Movement
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 18 Aug 2004 01:45:16 GMT
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Viewed:
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1072 times
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In lugnet.cad, David Laswell wrote:
> In lugnet.cad, Travis Cobbs wrote:
> > What I was saying is that there's no easy way to do it purely based on the
> > geometry.
>
> Exterior geometry may be a bit fuzzy when you start rotating it to different
> angles, but center geometry is just a matter of straight lines or mathematical
> points. They either match or they don't. There is no "sorta match". Any
> accurate system you could come up with for matching the exterior geometry
> together would probably just be a more complicated version of using center
> geometry.
To add my 2 cents worth, I've tried a few experements within MBC for making
parts clickable where I defined "male" and "female" connection points within the
brick (i.e. STUD = male). Ignoring the sheer number of ways even a brick as
simple as the ubiquious 2x4 can be connected the real barrier I ran into was
with geometry.
If the bricks are aligned then making them click is reasonably easy, but if the
one of the bricks needs to be rotated (through upto 3 axis) to make them align
and click the problem then seems to become very non-trivial.
If anybody has any ideas to solve geometrical alignment, I'd love to know so I
can continue my experiments.
Andrew...
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Message has 5 Replies:
 | | Re: on Collision, stop Movement
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| (...) In terms of practical application, that sounds like a problem that needs to be addressed by the interface software, such as MLCad. In terms of what needs to be done for LCD to accomodate that, I'd say that polarity will be required for a (...) (20 years ago, 18-Aug-04, to lugnet.cad)
| | | Re: on Collision, stop Movement
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| (...) We discussed this years ago. Maybe there's some ideas there. (URL) solved many such alignment problems in 2D, but never in 3D. It's harder to visualize because of my poor drawing skills. I wonder if you can break it down into two 2D alignment (...) (20 years ago, 18-Aug-04, to lugnet.cad)
| | | Re: on Collision, stop Movement
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| (...) You need to have the user pick more than just the "male" and "female" locations. To get the two bricks on top of each other (instead of inside each other), the "male" and "female" locations ought to have some concept for up and down. For parts (...) (20 years ago, 18-Aug-04, to lugnet.cad)
| | | Re: on Collision, stop Movement
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| (...) Assuming you already know *which* male (M) should connect to which female (F), and that M is to be rotated (this might in fact be the difficult part to figure out!): Use the F <connection direction> as the primary axis for a coordinate system (...) (20 years ago, 18-Aug-04, to lugnet.cad)
| | | Re: on Collision, stop Movement
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| (...) I have a 12 year old in my Game Maker class. He is building models and hoping to bring them into Anim8or (or Blender) via POV-Ray. He then hopes to bone the tri-mesh and create animations. Each frame of the animation will then be used to build (...) (20 years ago, 18-Aug-04, to lugnet.cad)
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Message is in Reply To:
| | Re: on Collision, stop Movement
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| (...) hundred different means of connecting various parts together, and many of them are not the sort of thing that you'd just look at and think, "Yes, these two parts are intended to connect together like so." Some of them might be accidental (the (...) (20 years ago, 16-Aug-04, to lugnet.cad)
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