Modular buildings - fitting floors together

[quilkin]

I've prepared two floors of a house design, but now having trouble fitting the first floor back onto the ground floor. I've tested it at various times earlier , and it worked OK before but something has now prevented it going together.

Initially I had just one red 2x2 on a corner with the aim of 'fixing' the floors together (which will be replaced with a white tile when everything's completed). When I found that the top floor didn't fit any more, I raised the corner a bit to see if there was something underneath that was catching, but still it won't fit.

Maybe it isn't just a problem with fitting on a complete floor, because as the model gets more complex I sometimes seem to be having trouble even fitting single brick in place unless the view aspect is in one particular position. Is this a limitation of LDD or am I doing something incorrectly?

If anyone has time to have a look, the file is house-11.lxf, in this folder: https://www.cubbyuse...1011c192a36f432

Thanks.

....[later]

Well I have now joined the floors without any problem, just by attempting the operation by 'looking' from the other side of the building. So, is there any 'golden rule' about ensuring that the view is correct to enable parts to snap together?

Edited October 26, 2015 by quilkin

[SylvainLS]

I was about to say it’s doable just before I saw your update.

You want rules… eh, an observation first: your 1st floor has lots of studs on top, ground floor has tiles; LDD seems to prefer to connect the 1st floor under the ground floor because more studs will connect.

So for a first rule: try to have more studs where you want the connection (hide the offending anti-studs or place tiles).

For the view angle, sometimes, LDD is more inclined to place on top if you look from the top, sometimes, LDD prefers you to look almost horizontally….

Another note: you can grab the selection by any of its bricks, so this particular brick is under the mouse and easier to place.

[quilkin]

You want rules… eh, an observation first: your 1st floor has lots of studs on top, ground floor has tiles; LDD seems to prefer to connect the 1st floor under the ground floor because more studs will connect.

So for a first rule: try to have more studs where you want the connection (hide the offending anti-studs or place tiles).

OK, that make sense, so when I add the roof to the upper floor, it won't try to connect underneath the ground floor.

For the view angle, sometimes, LDD is more inclined to place on top if you look from the top, sometimes, LDD prefers you to look almost horizontally….

Yes, the 'sometimes' appears to be quite arbitrary!

Another note: you can grab the selection by any of its bricks, so this particular brick is under the mouse and easier to place.

That sounds useful as well. Many thanks for the help.