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I have a series of models (representing instruction steps) that I would like to
render at the same scale with LDView. I can use LDView to save snapshots from
the command line (LDView model.ldr -SaveSnapshot=model.png), but I cannot figure
out how to cause snapshots of different-sized models to be saved at the same
scale (so that individual parts are rendered at a constant size).
I thought that I might be able to use the -ModelSize or -cg options to force the
same camera perspective in each case, but this doesn't seem to do what I'd like.
Here are three example images:
http://www.brickshelf.com/gallery/anoved/Examples/step1.png
http://www.brickshelf.com/gallery/anoved/Examples/step2.png
http://www.brickshelf.com/gallery/anoved/Examples/step3.png
Notice how as the size of the model increases, the individual 2 x 4 plates are
scaled down to fit the snapshot size. Is there a way to circumvent this effect?
Perhaps not insignificantly, I am using the 3.2 alpha version built on my Mac,
as discussed here earlier this year. I realize that ldglite or L3P could be used
instead, but I'm just curious if it is possible to accomplish this with LDView.
Thanks,
Jim
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In lugnet.cad, Jim DeVona wrote:
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I thought that I might be able to use the -ModelSize or -cg options to force
the same camera perspective in each case, but this doesn’t seem to do what I’d
like.
Here are three example images:
http://www.brickshelf.com/gallery/anoved/Examples/step1.png
http://www.brickshelf.com/gallery/anoved/Examples/step2.png
http://www.brickshelf.com/gallery/anoved/Examples/step3.png
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I’m not sure what your command line was for those, but -ModelSize=x should work
fine, as long as you set x to be big enough. With the current source code, -cg
(with radius) should also work fine. Despite the fact that -cg was documented
to support the radius part in LDView 3.1, it in fact didn’t. I fixed that, but
perhaps my fix happened after the LDView 3.2 alpha release. There will be a 3.2
Beta 1 release very shortly. (In fact, the Windows and Linux files have already
been posted to SourceForge.net.) I’d suggest waiting for that, or building from
source, because I know I did some command line fixes in this area after getting
bug reports from someone else. (I know you built from source in the past;
otherwise I wouldn’t bother even suggesting it.)
The thing to remember about -ModelSize is that you need to set it to be big
enough so that your biggest model will fit. It’s good to combine this with
-AutoCrop=1. So, I used the following command lines successfully with LDView
3.2 Beta 1 (built from current CVS source tree):
LDView.exe -ModelSize=600 -AutoCrop=1 D:LDRAW\parts3005.dat
-SaveSnapshot=3005.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
LDView.exe -ModelSize=600 -AutoCrop=1 D:LDRAW\parts3003.dat
-SaveSnapshot=3003.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
LDView.exe -ModelSize=600 -AutoCrop=1 D:LDRAW\parts3001.dat
-SaveSnapshot=3001.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
LDView.exe -ModelSize=600 -AutoCrop=1 D:LDRAW\parts2356.dat
-SaveSnapshot=2356.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
Notice that all of the above images were generated using 1024x1024 as the
snapshot size. Notice also that AutoCrop=1 cropped them to the actual size
needed.
--Travis
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That’s a first for me. The web Preview of my previous message looked different.
The images were all placed on the line after their associated command line,
which was what I wanted, and made it easier to read.
--Travis
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In lugnet.cad, Travis Cobbs wrote:
> In lugnet.cad, Jim DeVona wrote:
> > I thought that I might be able to use the -ModelSize or -cg options to force
> > the same camera perspective in each case, but this doesn't seem to do what
> > I'd like.
> >
> > Here are three example images:
> >
> > http://www.brickshelf.com/gallery/anoved/Examples/step1.png
> > http://www.brickshelf.com/gallery/anoved/Examples/step2.png
> > http://www.brickshelf.com/gallery/anoved/Examples/step3.png
>
> I'm not sure what your command line was for those but -ModelSize=x should
> work fine, as long as you set x to be big enough. With the current source
> code, -cg (with radius) should also work fine. Despite the fact that -cg was
> documented to support the radius part in LDView 3.1, it in fact didn't. I
> fixed that, but perhaps my fix happened after the LDView 3.2 alpha release.
> There will be a 3.2 Beta 1 release very shortly. (In fact, the Windows and
> Linux files have already been posted to SourceForge.net.) I'd suggest
> waiting for that, or building from source, because I know I did some command
> line fixes in this area after getting bug reports from someone else. (I know
> you built from source in the past; otherwise I wouldn't bother even
> suggesting it.)
>
> The thing to remember about -ModelSize is that you need to set it to be big
> enough so that your biggest model will fit.
What units does the -ModelSize argument use?
> ...
>
> Notice that all of the above images were generated using 1024x1024 as the
> snapshot size. Notice also that AutoCrop=1 cropped them to the actual size
> needed.
Thanks for the examples! Those are helpful.
Your recent changes must indeed have fixed something relevant; the images I
generate with the first few example commands are very large (and not to scale):
http://www.brickshelf.com/gallery/anoved/Examples/3003.png
http://www.brickshelf.com/gallery/anoved/Examples/3005.png
Out of curiosity, do you anticipate a Mac binary of the beta will be available?
If so, I can wait for that. Otherwise, I probably will dust off my notes and
have a go at building the current code.
Thanks again,
Jim
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In lugnet.cad, Jim DeVona wrote:
> What units does the -ModelSize argument use?
It uses LDraw units.
> Out of curiosity, do you anticipate a Mac binary of the beta will be available?
> If so, I can wait for that. Otherwise, I probably will dust off my notes and
> have a go at building the current code.
I do plan to release a Mac binary of the Beta. In fact, I'll probably get that
built and posted to sf.net before announcing it more officially and updating the
LDView web page.
--Travis
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In lugnet.cad, Travis Cobbs wrote:
> > Out of curiosity, do you anticipate a Mac binary of the beta will be available?
> > If so, I can wait for that. Otherwise, I probably will dust off my notes and
> > have a go at building the current code.
>
> I do plan to release a Mac binary of the Beta. In fact, I'll probably get that
> built and posted to sf.net before announcing it more officially and updating the
> LDView web page.
Neat!
Here's what I get with my quick attempt to try the examples with the current
code, built using the same Qt 3.3.7 I used for the alpha. The bricks appear
scaled correctly, but there are some large artifacts.
ldview -ModelSize=600 -AutoCrop=1 $LDRAWDIR/parts/3003.dat
-SaveSnapshot=3003-b.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
http://www.brickshelf.com/gallery/anoved/Examples/3003-b.png
ldview -ModelSize=600 -AutoCrop=1 $LDRAWDIR/parts/3005.dat
-SaveSnapshot=3005-b.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
http://www.brickshelf.com/gallery/anoved/Examples/3005-b.png
I'm not sure if that's due to a problem with my build procedure (such as it is,
./makeall basically) or what, but I'm content to wait for your beta.
Again, thanks for your response and the effort you put into LDView.
Jim
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In lugnet.cad, Jim DeVona wrote:
> Here's what I get with my quick attempt to try the examples with the current
> code, built using the same Qt 3.3.7 I used for the alpha. The bricks appear
> scaled correctly, but there are some large artifacts.
>
> ldview -ModelSize=600 -AutoCrop=1 $LDRAWDIR/parts/3003.dat
> -SaveSnapshot=3003-b.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
> http://www.brickshelf.com/gallery/anoved/Examples/3003-b.png
>
> ldview -ModelSize=600 -AutoCrop=1 $LDRAWDIR/parts/3005.dat
> -SaveSnapshot=3005-b.png -SaveActualSize=0 -SaveWidth=1024 -SaveHeight=1024
> http://www.brickshelf.com/gallery/anoved/Examples/3005-b.png
Hi all,
Adding -SaveZoomToFit=0 to the LDView command line resolves this problem. Thanks
to Travis for the suggestion.
Jim
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In lugnet.cad, Travis Cobbs wrote:
> I do plan to release a Mac binary of the Beta. In fact, I'll probably get that
> built and posted to sf.net before announcing it more officially and updating the
> LDView web page.
It appears that some people read this. There were 13 downloads of the Mac
Binary immediately after I posted my official release announcement for LDView
3.2 Beta 1 (one of which was my test download). There were only 3 downloads of
each of the Windows executables (3 total of which were also me).
--Travis
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