Subject:
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Re: [LDAO] Editor Feedback requested
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 20 Nov 1998 13:00:05 GMT
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Viewed:
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2725 times
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Once upon a time, sparre@sys-323.risoe.dk (Jacob Sparre Andersen)
wrote:
> Steve Bliss wrote:
>
> > Jacob Sparre Andersen wrote:
> >
> > > If you want to use the instructions paradigm, then the
> > > proper solution is most likely to let the user have an
> > > option for handling every line as a separate step.
> >
> > Wow. That could mean hundreds of step-images, for large models at
> > least.
>
> Yes, but I would probably not keep more images at a time
> than what's needed to fill the screen/window.
Right. Or keep just a few more off-screen images, for interactive
performance.
If there was a set of maps (color, z-buffer and part) for each
element, these could be quickly combined into the display images.
> > > It should of cause be possible to choose a part by pointing
> > > at it on the drawings (not as hard as it might sound).
> >
> > True. I can think of two approaches of the top of my head (use math
> > to do 3D hit-testing, or build a part-bitmap during rendering, and
> > lookup the clicked pixel in the part-bitmap). But that doesn't help
> > if someone accidently hides a piece.
>
> I was thinking of a part-bitmap. I think 3D hit-testing is
> slower, even counting the time to make the part-bitmap.
Probably. There's not a large overhead in building the part-bitmap
during rendering. But it does cost some extra memory. The 3D
hit-testing shouldn't be too bad, with proper implementation (pre-sort
parts by bounding boxes, etc).
> | Now, can someone figure out a solution to the problem of using the
> | mouse to drag parts around the drawing?
>
> What makes most sense to me is that you only move the part
> in a plane parallel to the image. - You move the pointer in
> that plane, so you move the part in that plane. - This will
> of cause demand more than one drawing window to create a
> model (I would use four: top, side, front, and 3D).
Good idea. Might cause some problems (for the user) in the 3D view,
because the dragged parts would end up with a lot of decimal places in
the position compoments. Unless the editor included snap-to functions
(also a good idea for a LEGO modeling editor).
Steve
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Message has 2 Replies:
 | | Re: [LDAO] Editor Feedback requested
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| (...) You seem to be reading my mind. :-) (...) Yes, but we would have to add information about how the parts stick together to the files. Play well, Jacob ---...--- -- E-mail: Jacob.Sparre.Andersen@risoe.dk -- -- Web...: <URL:(URL) -- ---...--- (...) (26 years ago, 20-Nov-98, to lugnet.cad)
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Message is in Reply To:
| | Re: [LDAO] Editor Feedback requested
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| (...) Yes, but I would probably not keep more images at a time than what's needed to fill the screen/window. (...) I was thinking of a part-bitmap. I think 3D hit-testing is slower, even counting the time to make the part-bitmap. | Now, can someone (...) (26 years ago, 20-Nov-98, to lugnet.cad)
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