Hi Axel,

> Are there any restrictions during the trial period?

Nope, there are no restrictions during the trial period.


> It is high resolution scan in bmp format, but when opening and aligning,
> it looks more and more blurred with more pixels.
> And: what I don't manage is to get the real model size, in this case 300mm length.

What is the resolution of the image? Also just a quick note - it's often better to store images in PNG format which has a type of compression built into it which reduces file size by quite a bit. BMP images are a kind of older bitmap format and won't be compressed so they take up a lot more disk space.

To display the image in the 3D viewport, MoI needs to use the image as a texture map, and often times video cards have limits on the maximum size of texture map that they support. Also because it's often limited MoI itself will downscale images over a certain size, that size is adjustable in moi.ini . To change that, go to Options > General and push the "Edit .ini file" button, then look in the [View] section for MaxTextureSize (it's probably right at the top), you might try setting that to MaxTextureSize=4192 and see if that works better for you.


> And: what I don't manage is to get the real model size, in this case 300mm length.

Like Brian mentions above, probably the best way to handle this is to use the Align feature inside the Bitmap command. That will allow you to draw a line on the image and match it to a line inside model space. Check out here for some demos of it:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1982.9

Also this shows how to snap an image into place into an existing already placed model rectangle:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1982.6

Some other related info on background image placement and snapping here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=2501.14


> I would like to unfold in MoI to a 2D format certain parts to use in
> Corel Draw, for example, for further works.

MoI does not have any unfolding capabilities in it at this point in time, so you would need to use a different program to handle that part. Rhino and also FormZ I believe have some functions for that, and there are some other polygon mesh programs you could try:
http://laminadesign.com/
http://www.tamasoft.co.jp/pepakura-en/

The upcoming MoI version 3.0 has new support for generating 2D output, but it's projected hidden-line type output, which is not the same as an "unwrap". Some demos of that here though:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6297.1

- Michael