Subject:
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Re: L3Lab - yet another LDraw viewer
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 15 Feb 2000 17:05:37 GMT
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Viewed:
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745 times
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In lugnet.cad, Lars C. Hassing wrote:
> > Do you plan on releasing the source code?
>
> Yes. But I would like to reorganize the code first. Remember it is still
> an experimental program - all sorts of speed-up algorithms are present
> in the code controlled by some flags. Many too-slow tries should be
> deleted first.
Just don't get bogged down in the cleanup! Hey, I released the LDAO source
code. And that's some of the ugliest code I've ever coded.
> Chris Dee wrote...
> > Well done Lars and thanks for releasing it. The mouse controlled rotation will
> > be a great help for checking new parts.
>
> I especially like to have "Show all colors as transparent" ON and "Dither
> transparency" OFF when rotating new parts. And random colors.
> Also "Show ALL Line Type 5" is useful.
L3Lab will definitely do a lot to help with parts-inspection. Even just being
able to rotate with the mouse will make the process so much easier!
> Steve Bliss wrote...
> > Wow. I'm amazed. My ridiculous big ship renders in 18 seconds. Regardless of
> > the zoom setting. LDLite takes some 80 seconds on the same model.
>
> Really, I think the zoom setting does matter?
Well, I only tried reasonable zoom settings, 45% to 100%. I didn't see a
significant speed difference in this range.
<click click click> I just tried it at 1% zoom. It only took 5 seconds to
render.
> > The choice of yellow as the edge-color for red was unexpected...
>
> The edge color of 4 is 12 light-red, and I can see my light-red is
> rather yellow, RGB(255, 154, 33) as opposed to LDraw RGB(255, 85, 85).
> My light-red was chosen for L3P's 32+12=44 Transparent light-red (orange),
> when L3P used the same colors (RGB values) for non-transparent and
> transparent colors. I have changed this for the next L3P, as this
> tweaking/compromising of RGB-values to fit both sometimes resulted
> in inexpedient colors.
Ah. OK.
> Bram Lambrecht wrote...
> > 2) Can I turn off error messages? For example, it's annoying that it tells me
> > I only have 65536 colors every time I start the program.
>
> I have experienced some funny problems on my graphics board (NVidia RIVA 128ZX)
> when I only use 65536 colors, so I thought I'd better issue a warning. There were
> differences in the background color in the updated areas.
I just noticed that off-color background problem. I've got an NVidia 4400. But
I haven't seen a big enough variation to worry about it.
> > 3) Can I change the default background color, zoom, etc?
>
> Well, not yet. I still need to figure out what the best GUI for camera settings
> would be. And I need to make a dialog for general/default settings.
IMO (not that you asked), the best GUI for the view angle (not necessarily other
view settings) is a drop-down list of predefined settings, with an additional
dialog for the user to add the current settings to the list.
> > 5) What command line options does the program support?
>
> Currently only a filename (used when dropping a file to the program icon)
> But I have thought of -P for polling a file from LDAO.
> Now you have to turn on polling in the File menu.
Polling should turn off the error messages, at least as an option (maybe -P1?)
> Fredrik Glöckner wrote...
> > I'm stunned speechless! Wow.
> >
> > You may consider restricting the views to be -- uhm, what's the
> > correct term again? -- isometric? When starting out with an oblique
> > view and rotating with the mouse, you may end up with a view that is
> > "skewed". I think that forcing the axes to be perpendicular and
> > equally scaled may be a good idea.
>
> and Sproaticus added...
> > This happens only (that I've seen) if you use the "Ldraw View" view, which is
> > slightly skewed in and of itself. If you use any of the true isometric views
> > (starting from the toolbar button *after* the "Ldraw view"), the model doesn't
> > skew during rotation.
>
> This is correct. The standard LDraw 3D view (which L3Lab starts with,
> and which you can select with the toolbar button with the green dot)
> is not an orthographic view, it is oblique. So when applying rotation
> to the standard LDraw view matrix, you get a more and more skewed image.
> I did think about automatically switching to orthigraphic when pressing
> the mouse button, but I left it as a "feature" because it looked funny.
> But I agree, it is confusing. I have now changed to code to do the switch.
>
> Fredrik Glöckner continued...
> > Also, I would like to se an output of the transformation matrix of the
> > current view (for use in, eg., LDAO or LDraw), and it would be nice to
> > be able to save the current image.
>
> You can have the matrix in Test/Statistics.
> Do you want a one-liner too to paste into other programs?
Yes, that would be quite helpful.
Steve
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Message is in Reply To:
 | | Re: L3Lab - yet another LDraw viewer
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| Thank you all for the many nice comments. Here follows replies to several questions: Michael Lachmann wrote... (...) Thanks Michael. L3Lab is built on MFC (linked statically), it hasn't any OpenGL, DirectX or other libraries. It is written in C/C++, (...) (24 years ago, 15-Feb-00, to lugnet.cad)
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