Subject:
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LDView 3.2 on Mac OS X with Qt 3.3.7 status report
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Newsgroups:
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lugnet.cad.dev.mac
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Date:
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Thu, 1 Mar 2007 04:29:40 GMT
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Viewed:
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8880 times
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Just an update on my LDView tinkering. I got Qt 3.3.7 compiled and used it to
rebuild the current LDView 3.2 code. As predicted in the other LDView thread,
using Qt 3.3.7 instead of Qt 4.2.2 resolved some of the issues I’d observed,
most notably the problem invoking fly through mode and the funny window and
dialog borders. So it’s good to have those problems explained.
However, it turns out that Qt 4 provides some advantages. I downloaded two clean
copies of the LDView 3.2 source and built one with Qt 3 and the other with Qt 4.
I’ve experienced crashes with the Qt 3 version that haven’t happened with the Qt
4 version when invoking full screen mode, when toggling the status bar with a
model loaded, and when generating a parts list. A trivial difference is that the
file picker filter is case sensitive in Qt 3 but not in Qt 4 (ie, CAR.DAT shows
up in Qt 4 but not in Qt 3’s open dialog unless you select the “All files”
filter).
Most significantly, there is a performance difference. The Qt 4 version renders
faster for noticeably smoother rotation and manipulation. The screenshot below
shows LDView 3.2/Qt 4 on the left and Qt 3 on the right. I’ve set the model
spinning at roughly the same speed with the same render options in both
versions. The Qt 4 application is in the background:
The Qt 4 FPS was around 75-80 and the Qt 3 FPS was 45-50! I have to admit that
seems like a pretty compelling reason to favor the newer Qt. On the other hand,
the screenshot does show how the interface looks cleaner and more compact under
Qt 3. The preferences dialog is all better too.
Anyway, that’s where I’m at with LDView. It looks like the Qt 3 version is
statically linked (no separate Qt libs shown open) while the Qt 4 version is not
(my /usr/local Qt 4 libs are shown open when it’s running). Both versions are
statically linked to the Boost libraries thanks to the suggestion you gave in
the other thread. The point being that my next objective will be to try to
eliminate that last Qt 4 dependency and then build PPC or maybe Universal
versions so that we can provide standalone Mac LDView 3.2 betas in various
flavas until such time as an official release.
Happy to be able to fly through,
Jim
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Message has 2 Replies:
 | | Re: LDView 3.2 on Mac OS X with Qt 3.3.7 status report
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| I've tried a little (without success) to get QT4 to build as a universal static library. If I get that working, I'll see if I can't work out the QT4-specific bugs. While the border and extra space on top aren't good in the QT4 version, the overall (...) (17 years ago, 1-Mar-07, to lugnet.cad.dev.mac, FTX)
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