#684 Roof Slope Angle

[Kennedy.DE]

Dear Sirs,

Please add "slope angle" to the roof object in order to facilitate the roof creation during plan editing. Roofs are not so easy to align with the wall elevation, so please add this feature to the object.

Best Regards,

By the way: Te easiest software for home design is SweetHome 3D. by far.

[OK Hoff]

Just for the record. If you import a roof (or any object) the model can be rotated from the original orientation. SHIFT+ green arrows under import, will let you increase or decrease the model rotation - see the little tool-tip that shows the off-set from original in degrees. But, how you stretch the model with height and depth ratio, will also influence on the angle. The latter is usually a better approach, because it does not skew the roof ends.

It is very true that getting angles right can be a bit cumbersome (at least for all of us who did not do French geometry in school). And finding the right angle for a roof is sometimes a miss-and-hit exercise - but using the blue corner adjustments of the (roof) model to raise, adjust height and dimensions and so on (without magnetism), will allow you to place the roof gently in place.

Still - if you need very accurate measures, as you surely know, the calculations ara also not black magic. For instance, if you put =DEGREES(ATAN(height_difference/wall_length)) into a spreadsheet, you will get the angle of the sloped wall. And you can use a similar exercise for the roof to ensure perfect angle.

In fact, if you work a lot with sloping walls, you may find some posts useful to make a spreadsheet for calculating angles, intercept-heights etc.:

1) for calculating slope angle and Pythagorean length of roof (slope):
http://www.sweethome3d.com/support/forum/viewthread_thread,5144

2) for finding height of wall intercepting with a sloping wall:
http://www.sweethome3d.com/support/forum/viewthread_thread,2054

ok

PS - this illustration shows an example of various calculations, and the angle at the bottom (in blue) is calculated as the arctangent of height difference (1,80) / wall length (4,50). The roof length is Pythagoras and so forth...

[Kennedy.DE]

Dear Sir, THank you so much for your answer.

I would like to contribute to SweetHome 3D improvement using my programming
knowledge and ideas.
Is it possible?

Best regards,

2015-02-10 5:02 GMT-03:00 OK Hoff okhoff@users.sf.net:

Just for the record. If you import a roof (or any object) the model can be
rotated from the original orientation. SHIFT+ green arrows under import,
will let you increase or decrease the model rotation - see the little
tool-tip that shows the off-set from original in degrees. But, how you
stretch the model with height and depth ratio, will also influence on the
angle. The latter is usually a better approach, because it does not
skew the roof ends.

It is very true that getting angles right can be a bit cumbersome (at
least for all of us who did not do French geometry in school). And finding
the right angle for a roof is sometimes a miss-and-hit exercise - but using
the blue corner adjustments of the (roof) model to raise, adjust height and
dimensions and so on (without magnetism), will allow you to place the roof
gently in place.

Still - if you need very accurate measures, as you surely know, the
calculations ara also not black magic. For instance, if you put
=DEGREES(ATAN(height_difference/wall_length)) into a spreadsheet, you will
get the angle of the sloped wall. And you can use a similar exercise for
the roof to ensure perfect angle.

In fact, if you work a lot with sloping walls, you may find some posts
useful to make a spreadsheet for calculating angles, intercept-heights etc.:

1) for calculating slope angle and Pythagorean length of roof (slope):
http://www.sweethome3d.com/support/forum/viewthread_thread,5144

2) for finding height of wall intercepting with a sloping wall:
http://www.sweethome3d.com/support/forum/viewthread_thread,2054

ok

PS - this illustration shows an example of various calculations, and the
angle at the bottom (in blue) is calculated as the arctangent of height
difference (1,80) / wall length (4,50). The roof length is Pythagoras and
so forth...

Attachment: sh3d_slope_caluclations.xl.png (9.1 kB; image/png)

• [feature-requests:#684]
  http://sourceforge.net/p/sweethome3d/feature-requests/684 Roof Slope
  Angle*

Status: open
Group: Future_Release
Labels: Roof slope
Created: Wed Feb 04, 2015 10:53 PM UTC by Kennedy.DE
Last Updated: Wed Feb 04, 2015 10:53 PM UTC
Owner: nobody

Dear Sirs,

Please add "slope angle" to the roof object in order to facilitate the
roof creation during plan editing. Roofs are not so easy to align with the
wall elevation, so please add this feature to the object.

Best Regards,

By the way: Te easiest software for home design is SweetHome 3D. by far.

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[OK Hoff]

like to contribute

Hi, have a look at sweethome3d.com - especially http://www.sweethome3d.com/faq.jsp#contributions. ok

[OK Hoff]

Attempt at schematic slope/angle/intercept calculation.

[OK Hoff]

Updated image.

[OK Hoff]

An interactive illustration with the same purpose, using GeoGebra:

http://tube.geogebra.org/student/mE4LfeDfJ