TRIM TO ROOF

[Anonymous]

HOW COME WHEN I TRIM TO ROOF , THE ENDS OF THE WALL I AM TRIMMING DO NOT TRIM TO ROOF?

[Dwight]

[SURE IS NOISY IN HERE TODAY - TOO MUCH CALCULATING]

SO YOU END UP WITH THESE SILLY LITTLE TALL FLAT WALL BITS?
YOU SHOULD BE SO LUCKY TO HAVE A TRIMMING TOOL AT ALL!
BE GRATEFUL!

WHAT?

THE ROOF ONLY TRIMS THE WALL DIRECTLY UNDER IT, SO YOUR WALLS STICK OUT, EVEN IF BY A TINY FRACTION.

SLOPPY DRAFTING!

[Link]

Dwight wrote:
SLOPPY DRAFTING!

Or a hip roof. You need to SEO the wall to any and all roofs directly above it. What I wouldn't recommend is taking all walls and all roofs and SEOing because it create way too many relationships.

You could also use Trim to Roof, because ti works slightly differently than SEO. It just uses the plane of the underside of the roof to trim the entire wall. Whereas SEO will use the exact extents of the underside of the roof to just trim the parts of the wall it touches, now and in the future.

Cheers,
Link.

[Dwight]

This deserves clarification:

Archicad users should use "TRIM TO ROOF" as the primary wall trimming tool for conventional construction. This, after closely matching the wall height approximately to the height of the highest roof. The "TRIM" command does a nice job of automatically marching a whole number of different wall/roof relationships and is best for conventional situations.

There was a time when this command worked differently, but thanks to Graphisoft and motivated users, the tool was changed to trim ONLY THE PART OF THE WALL THAT IS ACTUALLY UNDER THE ROOF PART, AND NOT TO A PLANE IN SPACE CREATED BY THE ROOF PLANE TRIM (like it used to do).

See attached, after "Trim to roof."

This is probably the source of the poster's issue - if a wall overshoots an intersection, the trim command will miss it.

[Dwight]

Regarding Hip roofs:

The Trim to Roof command now operates correctly correctly under hip roof conditions.

(See attached)

However, in this condition - a hip - sloppy drafting shows itself. If a tiny gap exists in the hip parts meeting, the wall trimmed will shoot up between the roof parts.

That SEO things is yxes, but in my experience, it is too many things for a beginner to manage - nevermind the extra calculations.

[Dwight]

Simply by shifting the roof plane 1/8" from touching results in these irregularities.

(see attached)

[Dwight]

Should you want a roof plane covering only part of a wall to make the entire wall top slope, you can make a roof large enough to do that and then hide the roof or discard it. The wall will retain the cut.

[Link]

Dwight wrote:
There was a time when this command worked differently, but thanks to Graphisoft and motivated users, the tool was changed to trim ONLY THE PART OF THE WALL THAT IS ACTUALLY UNDER THE ROOF PART, AND NOT TO A PLANE IN SPACE CREATED BY THE ROOF PLANE TRIM (like it used to do).

Right you are Dwight! It's been so long since I've used or taught Trim to Roof, I didn't even realize it had been upgraded!

If sloppy drafting is the problem, maybe just ctrl/cmd click the roofs back together and eliminate the gap.

Cheers,
Link.

[Dwight]

Let me get the whiskey and the corn cob pipe and we can set a while on the porch, watch the sunset and reminisce about the old days.

I also notice that they seem to have added some error tolerance into the trim function. Used to happen all the time, these tiny wall slices. Infuriating!