Hi PP,

> How people know some basics informations as a door
> heigt, laptop thickness...

Well, you can always use a tape measure and make a measurement yourself.

A lot of times you should be able to make a pretty good guess at some common measurements too though. Like for example you would know that a door is going to be taller than your own height, but not twice as tall as your own height... And a laptop is not going to be a foot thick, more like 1 inch thick.

If you do want to be exact, then you would want to do some measuring or use some blueprints that have dimensions labeled on them where it shows the heights and sizes of the stuff in the blueprint.


> Do people take 3 photos (top/face/side) of objets, should I
> train to be able to create a 3D model from a single perspective
> picture (found on "google image") ?

Some people might do that, but it kind of tends to be difficult to judge size just on a single perspective image. You can get fooled kind of easily about sizes because of the perspective foreshortening effect where objects that are further away are smaller in the image.


> As far as blueprints are concerned, When you create
> 2 objets from two blueprints, how do you adjust there
> size, because a chair is not the same size as a plane.

Well if you have built each object to its own proper scale, then you don't actually have to adjust their size because you've already created them at the proper size.

But if you need to change the size of an object there are a few different ways you can do it - you can select it in one of the 2D viewports and grab the scaling handle and drag it, see here for some information:
http://moi3d.com/2.0/docs/moi_command_reference11.htm#editframe

Another way is to use the Properties panel - that's a panel in the upper-right corner of the window that shows some information about the selected object, including its bounding size. If you click the bounding size line a little menu will pop out which will allow you to edit the bounding size to change it. There's some information on that here:
http://moi3d.com/2.0/docs/moi_command_reference11.htm#propertiespanel

In addition to that there's also a "Scale" command on the Transform tab which can be used to alter the size of objects, see here for a description of that:
http://moi3d.com/2.0/docs/moi_command_reference8.htm#scale

- Michael