Determine roof face slope from existing geometry?

[line-weight]

I'm fiddling about with roof face objects; haven't really used them much before.

 

See the attached screenshots. The brown coloured slab is horizontal. The white coloured slab is the one I'm trying to make as a roof face.

 

The plane of the white slab is determined by the geometry that's already drawn. If I were drawing it as an extrude, I would set the working plane by three clicks on the relevant edges of the joists you can see. So, the plane is pulled directly from the existing geometry and I know it should match exactly.

 

To make the roof face, I could draw the profile accurately in plan, and I could set the axis accurately (the axis can be generated by intersecting an extrude, drawn as described above, with the horizontal slab object).

 

However, to set the 'pitch' of the roof face object, I did it 'manually' (basically eyeballing it and adjusting the rise/run dimensions until it was correct). That's not ideal. Any clever ways to do it accurately? Do I have to do something like set the working plane, draw a line on it, find the angle of that line, copy and paste that angle into the roof settings? Still feels a bit messy.

 

[Markvl]

2 hours ago, line-weight said:

Do I have to do something like set the working plane, draw a line on it, find the angle of that line, copy and paste that angle into the roof settings? Still feels a bit messy.

 

 

This is exactly how I do it.  I haven't been able to think of another way.

[CipesDesign]

If you cut a section [perpendicular to eave] though the existing geometry (framing) then you can measure the slope/angle. The you can apply this angle to the Roof Face.

[line-weight]

Oh well, it seems this is what has to be done.

 

I'll get an angle that will be 12.527 degrees or something... and apply that, but then feel that it might not quite exactly match because of a rounding error somewhere.

Edited June 19, 2019 by line-weight

[bcd]

A good feature request for cases like this would be

Roof Face by 3 points

 

[line-weight]

3 hours ago, bcd said:

A good feature request for cases like this would be

Roof Face by 3 points

 

Yes!

[AlanW]

@line-weightHi, have you tried to draw a 3dpolygon and not actually produce a roof but a 3d surface.

[line-weight]

@Alan Woodwell Yes that is what I'd usually do. In this instance though, the question is specifically about the capabilities of the roof face tool.

[cberg]

Hmm...  After my rant about the wall tool, maybe we can start on the roof tool.  We also need an option to convert solids to roof faces.  :-)

Edited June 20, 2019 by cberg

[line-weight]

41 minutes ago, cberg said:

We also need an option to convert solids to roof faces.  🙂

 

Yes.

 

Also, I'd like to be able to extend/pull back individual roof layers on individual edges like you can with the floor slab tool.

 

The wall, slab and roof face tools are all a similar concept: a buildup with multiple layers. Ideally the way of editing each of them would be the same (in fact I'd argue they could all be the same thing: a "multilayer object" if you will, and you choose whether it's horizontal, vertical or sloping).