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macfrog
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Re: Splitting sloping walls?

hansmex,
>The shortcut involves the keyboard of a calculator
not always: i put a new wall (90 degrees off) to the wanted splitpoint, make this "helpwall" big as needed and store the wanted height for this splitpoint that way. it's not funny but it works.

too bad anyway, i was hoping to get an aswer like "hold down ALT+SHIFT then click mouse button into wall" :-)

It's not an architectural program, i know... Not YET ;-)
macfrog
[Jan 18, 2011 10:27:12 PM] Show Printable Version of Post    View Member Profile    Send Private Message [Link] Report threatening or abusive post: please login first  Go to top 
hansmex
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Re: Splitting sloping walls?

macfrog,

That's an ingenious but simple workaround.

I spent the last (half) hour reading on all kinds of geometry websites, trying to figure out if I could make a simple spreadsheet model that would allow inputting basic data, and resulted in giving the correct measures for the split wall.

Unfortunately this is far beyond my mathematical insight. Maybe, after all, I should have paid more attention during high school...

Hans
[Jan 18, 2011 11:00:16 PM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest [Link] Report threatening or abusive post: please login first  Go to top 
Puybaret
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Re: Splitting sloping walls?

Applying Intercept theorem (théorème de Thalès en français) between the walls length on the floor and their height should help you. wink
----------------------------------------
Emmanuel Puybaret, Sweet Home 3D developer
[Jan 18, 2011 11:15:03 PM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest    http://www.eteks.com [Link] Report threatening or abusive post: please login first  Go to top 
hansmex
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Re: Splitting sloping walls?

Hello :-)

It took me some time to intercept the meaning of the theorem, but here it is...



To calculate D (the height at the point where the wall is split) you do this simple math:

D = A / ( B/C )

So, first divide B by C
Then, divide A by that result.

Hans
[Jan 19, 2011 2:21:33 AM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest [Link] Report threatening or abusive post: please login first  Go to top 
Puybaret
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Re: Splitting sloping walls?

Thank you Hans for the drawing. I was sure you were able to understand the first theorem I learnt at school! wink
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Emmanuel Puybaret, Sweet Home 3D developer
[Jan 19, 2011 8:14:20 AM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest    http://www.eteks.com [Link] Report threatening or abusive post: please login first  Go to top 
macfrog
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Re: Splitting sloping walls?

Hello,

i just want to let you see the reason for this thread:

keep in mind: for changing a wall's texture of a given room, i have to split walls on room limits.
so, moving a wall forces me to split the aligning wall (again, and again)... so far for the calculating method, hans biggrin

screenshot below:



it's the upper level of a house with 10+ sloping walls, almost NEVER splitted in the middle. as you can see, the roof is missing wink
macfrog
[Jan 19, 2011 8:56:09 PM] Show Printable Version of Post    View Member Profile    Send Private Message [Link] Report threatening or abusive post: please login first  Go to top 
wrosun
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Re: Splitting sloping walls?

I like your model and can think about the hard work you have done to complete it but where is the problem???

is it solved already or are you trying to say that the things the experts said dint work or are you showing us the result after applying the solutions?
[Jan 20, 2011 7:31:18 AM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest [Link] Report threatening or abusive post: please login first  Go to top 
macfrog
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Re: Splitting sloping walls?

hi wrosun,

the "problem" was already solved before i started this thread. in first msg i wrote "i got a workaround" and i was asking for something easier i might have overseen.
i posted the picture just to let anybody see i donot ask for no reason; especially hans is very helpfull and spend some night with other peoples problems.
oh, and thanks for liking my model :)
[Jan 20, 2011 7:24:07 PM] Show Printable Version of Post    View Member Profile    Send Private Message [Link] Report threatening or abusive post: please login first  Go to top 
okh
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Re: Splitting sloping walls?

...intercept the meaning of the theorem...
Thanks Hans for your theorem interception, very useful. I think you mention something about doing the math in your much used roof guide. So as a hint, I took the liberty of putting a pointer to various calculations in SourceForge, feature-requests 684.

Maybe it is worth making a list of the most useful calculations for all of us who where not subjected to French maths in school? For instance, how to calculate the values indicated here, and probably a few more that I did not think of:
ok

[/
[Feb 10, 2015 8:19:45 AM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest [Link] Report threatening or abusive post: please login first  Go to top 
Puybaret
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Re: Splitting sloping walls?

In your drawing, intercept theorem says that:

4.5 / (3.4 - 1.6) = 2.2 / (2.48 - 1.6)

as you probably look for the 2.48 height here, the previous formula isn't very handy, but you can change it like this:

2.48 = 1.6 + 2.2 x (3.4 - 1.6) / 4.5

If you replace 1.6 by heightAtStart, 3.4 by heightAtEnd, 4.5 by distanceBetweenStartAndEnd and 2.2 by distanceFromStart, you get:

intermediateWallHeight = heightAtStart + distanceFromStart x (heightAtEnd - heightAtStart) / distanceBetweenStartAndEnd


Note that (heightAtEnd - heightAtStart) / bothWallsLength is a factor that could reapply elsewhere on walls with the same slope. This factor is also equal to tangent of 21.8°. Thus, if you know the 21.8° angle of the slope, you can also use:

intermediateWallHeight = heightAtStart + distanceFromStart x tan(slopeAngle)

If you want to calculate that angle, just reverse the formula:

slopeAngle = arctan((heightAtEnd - heightAtStart) / distanceBetweenStartAndEnd)


You might also wonder how to compute the 4.85 roof length. This time, it's Pythagorean theorem that will give you the answer because angles between walls and the floor are right:

4.85² = 1.8² + 4.5² = (3.4 - 1.6)² + 4.5²

If you replace 1.6 by heightAtStart, 3.4 by heightAtEnd and 4.5 by distanceBetweenStartAndEnd, you get:

roofLength² = (heightAtEnd - heightAtStart)² + distanceBetweenStartAndEnd²

or:

roofLength = sqrt((heightAtEnd - heightAtStart)² + distanceBetweenStartAndEnd²)

where sqrt is the square root.

Hope this will help smile
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Emmanuel Puybaret, Sweet Home 3D developer
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[Edit 1 times, last edit by admin267 at Feb 12, 2015 3:15:31 PM]
[Feb 12, 2015 8:54:38 AM] Show Printable Version of Post    View Member Profile    Send Private Message    Hidden to Guest    http://www.eteks.com [Link] Report threatening or abusive post: please login first  Go to top 
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