roof not "cutting off" at level

[tnitke]

In the attached image, I have a roof with the "Cutoff Level" set to Roof2, but as you can see it doesn't actually cut off at that level at all, but rather at some random distance above it. Base Offset and Cutoff Offset are both set to 0. I am trying to build a roof that has multiple plate (eave) heights, so I thought I would just cutoff the roof and then trace a new stacked roof on top of it and then join geometry. Isn't the Cutoff Level parameter supposed to slice the roof exactly at the Level's elevation? Am I missing something??

[Anonymous]

Roof is nothing relative level...
Roof height is relative only angle
you shoud to mind relative roof height
length,angle,Pascal triangle Ex=tan.costan.cos
but otherWay Roof cut
i am attach image
i am Korean english is beginner

[Anonymous]

I have seen similar behavior when the entire roof thickness does not
extend above the cut plane. Revit's roof algorithms seem to calculate
roofs and their relationships from the bottom surface upwards. Change to
wireframe view and see if the bottom edge of the ridge cut is below the
cut plane. A workaround is to create a void at the cut off level and use
it to cut the roof.

Robert Witte

tnitke wrote:

> In the attached image, I have a roof with the "Cutoff Level" set to Roof2, but as you can see it doesn't actually cut off at that level at all, but rather at some random distance above it. Base Offset and Cutoff Offset are both set to 0. I am trying to build a roof that has multiple plate (eave) heights, so I thought I would just cutoff the roof and then trace a new stacked roof on top of it and then join geometry. Isn't the Cutoff Level parameter supposed to slice the roof exactly at
> the Level's elevation? Am I missing something??
>
>
> ------------------------------------------------------------------------
>

[tnitke]

I checked your suggestion, and all of the ridges are in fact below the cutoff level. Also, I tried creating several other cutoff levels - higher and lower - and got the same problem.

(BTW, how do you get the previous message to appear in a Reply post? I am not seeing that option.)

[Anonymous]

image is combution after capture
roof height Is complex problem
you shoud yearn mathmatis program
after ,you try angle in your yern Program
Programs Riply your roof height
roof height Is only Relatived Roofangle
and tan angle degree and length of Roof triangle
gool luck !!!

[Anonymous]

The only other thing I can suggest is to try re-creating the roof. Good
luck.

As far as quoting the previous post, I use Netscape. It has a setting
under the preferences menu that can be set to quote the previous post. I
would assume Explorer has some similar setting.

Robert Witte

tnitke wrote:
> I checked your suggestion, and all of the ridges are in fact below the cutoff level. Also, I tried creating several other cutoff levels - higher and lower - and got the same problem.
>
> (BTW, how do you get the previous message to appear in a Reply post? I am not seeing that option.)

[Anonymous]

i'm attach image
i'm korean, english is beginner

[tnitke]

I think I figured out what is happening. If you look at the first image I supplied, the elevation I was viewing was in "hidden line" mode, so it didn't look like the roof was being cut by the Level. This image shows a roof that has a Cutoff Level of Roof2, and this time I am showing it in wireframe. Now you can see that the roof actually does get "cut" at the correct level, but then Revit continues the roof vertically instead of cutting off the roof horizontally, like a true "cutting plane" would do.

[tnitke]

Yes, I understand basic Trig very well. But I think you may have misunderstood the problem in my original post. All I was trying to figure out is why the roof wasn't actually being cut by the Level that I instructed the roof to be cut by. But, I have figured out what the problem was and posted the answer below.

[Anonymous]

i'm fully not under stand your massage
if you not begnner in Revit building
you shoud masscreating ,
masscreating is perfect solution of your everything problem
"roof by face" of mass
all face of Revit is mass "face Is mass"
good luck

[Anonymous]

Yeah, this goes back to what I said earlier, Revit seems to construct
roofs from the bottom up. Therefore it starts the cut where the plane
intersects the underside of the roof. I think that it would be more
intuitive if the roof was cut at the intersection of the upper surface
of the roof and the cut plane. To get that effect just measure the
height of the vertical cut surface and use that number (remember to make
it negative) as your cutoff level offset and you will be good to go.

I would guess that the program makes a vertical cut because in most
cases the cut roof will abut a wall or the vertical cut of another roof.

Robert Witte

tnitke wrote:
> I think I figured out what is happening. If you look at the first image I supplied, the elevation I was viewing was in "hidden line" mode, so it didn't look like the roof was being cut by the Level. This image shows a roof that has a Cutoff Level of Roof2, and this time I am showing it in wireframe. Now you can see that the roof actually does get "cut" at the correct level, but then Revit continues the roof vertically instead of cutting off the roof horizontally, like a true "cutting
> plane" would do.
>
>
> ------------------------------------------------------------------------
>

[tnitke]

Agreed.

Good to see that at least one person understands what I was trying to say. I was beginning to doubt my ability to communicate. 😉