Subject:
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Re: "Left" view
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Wed, 7 Dec 2005 17:26:25 GMT
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Viewed:
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13668 times
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In lugnet.cad.mlcad, Steve Bliss wrote:
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Hmm, maybe. But in both first- and third-angle projections, the central
view/projection shows the same side of the object.
In the case of MLCAD, when you choose ‘front view’, you are shown the front
of the model. Same for top, bottom, and back views. When you choose ‘left
view’, you are shown the right side of the model. Likewise, choosing ‘right
view’ results in being shown the left side of the model.
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Actually, front and back are the same in both projections. One might argue that
since MLCad does the top and bottom views that we’re expecting, that this
invalidates the argument. However, remember that the LDraw coordinate system is
flipped, with “up” being -Y. So in reality, the top and bottom view aren’t
flipped if you assume first-angle projection based on the coordinate system.
Having said this, I do believe that MLCad’s left and right are confusing,
because “up” to the user is -Y, and that should be how the projections are done.
And even if European draftsmen (draughtsmen if they’re British) might use
first-angle projections primarily, I would be surprised if the general populace
would conside a “top” view to be the one looking at the bottom of an object.
--Travis Cobbs
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Message is in Reply To:
 | | Re: "Left" view
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| (...) Hmm, maybe. But in both first- and third-angle projections, the central view/projection shows the same side of the object. In the case of MLCAD, when you choose 'front view', you are shown the front of the model. Same for top, bottom, and back (...) (19 years ago, 7-Dec-05, to lugnet.cad.mlcad, FTX)
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