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Print at Dec 18, 2025, 1:20:27 PM

Posted by lightweave at Sep 25, 2013, 11:42:20 AM

Length of a wall
It is unclear to me what the exact length of a wall is. I don't have a floor plan, so I go through my home, measuring each wall individually.
In SweetHome3D when I draw a roomw, the walls are connected to each other. The outer edge of the wall is always a bit longer then the inner edge. So I assume that the length of the wall is from the outer point to the outer point, right? How can I make sure that the inner length is the one that I want? Or asked differently, to what part of the wall is "length" refering to, when I draw a room by connected walls?

Posted by okh at Sep 25, 2013, 11:53:25 AM

Re: Length of a wall
Wall length is measured from middle of wall. The inner and outer lengths depend on wall thickness.

Depending on the complexity of your project, one hint could be first draw the room (which would have the correct INNER room measures), then double-click room with wall-tool to create walls around the room.

ok

Posted by okh at Sep 25, 2013, 12:56:51 PM

Re: Length of a wall
For the record, the easiest and most obvious point.

For rectangular walls, the maths is straightforward:
Inner length = Wall length - wall thickness
Outer length = Wall length + wall thickness
etc

ok

Posted by hal9000 at Sep 25, 2013, 1:40:18 PM

Re: Length of a wall

For the record, the easiest and most obvious point.

For rectangular walls, the maths is straightforward:
Inner length = Wall length - wall thickness
Outer length = Wall length + wall thickness
etc

ok

I think you're wrong. If I understand well how the walls are measured, then for a rectangular wall the middle length (or simply "length") is just the same than the outer and the inner lengths. For walls with one or two oblique sides (because of the connection with another wall) then the inner and outer length depends of the thickness, yes, but must be calculated with a bit of trigonometry wink

rather than simply add or subtract the thickness.

I might be wrong, of course, but I don't think so.
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If a long walk every day were healthy, mailmen would be immortal. tongue

Posted by okh at Sep 25, 2013, 2:37:03 PM

Re: Length of a wall
Ah, I may very well be wrong - or just lousy at expressing myself. This is what I meant: inner_outer_wall_measurements.sh3d

ok

Posted by okh at Sep 25, 2013, 3:01:29 PM

Re: Length of a wall
And the example assumes, of course, equal thickness of (straight) walls and 90 deg room angles. Anything else, I would agree Mr Pythagoras needs to get involved.

ok

Posted by hal9000 at Sep 25, 2013, 3:22:39 PM

Re: Length of a wall

And the example assumes, of course, equal thickness of (straight) walls and 90 deg room angles. Anything else, I would agree Mr Pythagoras needs to get involved.

ok

Even with 90 degrees angle in the union of two walls, you need to use trigonometry since the union itself is a line at 45 degrees. wink

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If a long walk every day were healthy, mailmen would be immortal. tongue

Posted by Puybaret at Sep 25, 2013, 3:27:16 PM

Re: Length of a wall
I guess that okh meant "for rectangular rooms surrounded by joined walls of same thickness" and not "for rectangular walls"... wink

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Emmanuel Puybaret, Sweet Home 3D creator

Posted by hal9000 at Sep 25, 2013, 3:58:43 PM

Re: Length of a wall
Well, after double check the drawings and the measures, I was wrong in the way I was thinking of the diagonals itself instead the sides. And in addition I was taking into account just a side of the wall, which means to add or subtract half of the thickness, but of course that means the full thickness when it comes to the full wall with its two sides.

In conclusion, I was all messed up myself. laughing

Nevermind.
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If a long walk every day were healthy, mailmen would be immortal. tongue

Posted by okh at Sep 25, 2013, 4:31:09 PM

Re: Length of a wall
Of course, rectangular _rooms_ is exactly what I meant :-) Mea culpa. Thanks.

With all its limitations, this rule of the thumb calculation is still quite useful when drawing up a simple home measuring from the inside (or outside).

okh

PS As for the diagonals, Mr Pythagoras can fix that, but I have yet to need him for that...

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Dec 18, 2025, 1:20:27 PM