Thanks, Anssi - that's correct. We get this a lot, where we want to make this as easy as possible for you, but if you don't have experience in large format printing, this can be confusing.
Follow this, and you'll know why:
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I took a well-known test model, called "CornerBar.skp" (5.6 MB) and sent to LayOut on A3 paper, and made it full paper size. Doc size is about 6.8 MB
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Now duplicate the page, so that my doc is 11 pages. Doc size is about 43.7 MB
Now, rename YourFile.layout to YourFile.zip and unzip it. Look at the "ref" directory in that unzipped section, and you'll see 11 png's. In my case, they're each 3.7 MB. These are the 2D snapshots of your 3D model. 11 x 3.7 = 40.7 MB.
These are zipped up, but since png's are compressed, there wont be that much change (see http://www.libpng.org/pub/png/pngintro.html for more on png). Why 11 different png's for 11 pages? Well, most users will manipulate each of these pages. If you weren't going to do that, you would have inserted a png image that you could have exported in SketchUp.
If you're done editing your 11 page document and what you want is 11 pages of exactly the same image (this is nonsense of course, because you'd likely have 11 different camera angles or scenes, so this is done ONLY as an exercise to make a point), do this:
- Delete all pages and delete the model reference, and insert one of the png images in your unzipped ref directory. Now duplicate that page 11 times and save. Doc size is about 3.7 MB !!
I have an 11 page document that looks exactly the same, and is now 1/10th the size. HOWEVER, I have no flexibility in changing scenes or styles or camera angles or anything.
So, this fun little exercise shows that in exchange for fast easy edits, you pay for it in disk and memory size. These are engineering trade-offs we'll continue to optimize and try to communicate better to LayOut users. Keep the feedback and experiences coming, and thanks for using LayOut.
Barry