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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Mon, 16 Aug 2004 04:20:56 GMT
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Viewed:
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1155 times
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In lugnet.cad, Edwin Pilobello wrote:
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I suppose, since there are no tolerances in ldr parts, then a test for
equality would work to determine a collision event and a “click” action. So
any move in MLCAD will only be allowed to be completed to the point of
intersect with another plane.
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3D collision detection is conceptually very simple, and isn’t even too difficult
to actually implement. If you want it to be fast, you can probably even
download a free software library to do it for you. But please re-read what I
said, because I still maintain that it won’t work for clicking virtual LEGO
bricks together.
Think of the following example. Take a 2x4 brick, and rotate it 13 degrees
around the X axis. Now take another one and perform the same rotation, then try
to line it up to click on top of the first. In order for the click to happen,
you have to get it into exactly the right position, and then move it down at a
77 degree angle. And since the tolerances are zero, I just don’t see how this
is going to be possible. If you know that there are “click points”, then the
software can detect that two click points are close together, and then
automatically perform the click. However, I really don’t see how you would be
able to determine click points based purely on the geometry in the LDraw file.
--Travis Cobbs
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Message has 1 Reply:
 | | Re: on Collision, stop Movement
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| (...) I'm very sure you're right about using LDRAW geometry. I'm not so sure about LCD. In my opinion, it would be beneficial to think in terms of making individual objects with associated ldr files and properties (20 years ago, 16-Aug-04, to lugnet.cad, FTX)
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Message is in Reply To:
| | Re: on Collision, stop Movement
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| (...) I looked into the LCD discussions. I'm sure it's quite sound. My experience with collision checking emanates from game programming. I teach a class derived from Dr. Mark Overmar's Game Maker software. In it I teach kids how to define bounding (...) (20 years ago, 15-Aug-04, to lugnet.cad)
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