Forums >> Revit Building >> Technical Support >> Rotating Roofs

David Ewing

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Bartholemew:

Your illustration caputures what I am trying to do: depcit the building envelope as planes or a thin roof. The difference is your planes have square corners, whereas my code states that i have to take natural grade along a line. This creates the 3 part angle you see in the rear elevation of my Post #4. Then THAT gets laid back at 45 deg.

The reason I can't use a Revit Floor or Toposurface is that I don't know where to put points in 3D space; they are the result of the interaction with the multi-angle line in one direction, and the 45 in the other.

SOLUTION:

I tried the suggestion of an In-Place Component extrusion, and it gave me the same error about not being able to rotate it. I avoided the rotation command as follows: I tried making a sweep instead of an extrusion using the multiple angle side as the Profile and the 45 deg angle as the path, but it put it in an uncertain place in space. I switched the path and the profile, drawing the profile the 45 and sweeping along the irregular path, and that worked. i should note that when I gave the In Place Family the category of Roof, I was not able to move the object up or down. Using the category of Generic Model created a less constrained object that I could move. Thanks for your suggestions!

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Bartholomew

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David, you know exactly where the hinge point is “in space”: its 15 feet above grade. Draw a floor exactly the same size and shape of your lot. It sounds like a typical residential rectangular lot; if so, you can define it with 4 points. Offset sketch line inwards the distance of whatever your front, rear and side-yard setbacks are, and then exit. Now, edit the floor using the Modify Sub Elements tool. Pick each of those points and change 0’0” to the “real” elevation + 15’0”. Now, add split it down the middle (longitudinally) and calculate the middle points’ elevations to achieve the slope you want. How does this not work?

Edited on: Fri, Feb 26, 2016 at 8:38:56 PM

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David Ewing

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Bartholemew,

The procedure for modifying points on a floor works. But when I go to a side elevation and try to rotate 45 deg, I get the error: "Can't change plane of Floor Sketch".

Someone on AUGi pointed out that I CAN rotate an In Place Family extrusion (as opposed to a sweep): After I create the varying roof by drawing the site variation and making a closed polygon a couple inches thick in the rear elevation view, I click the green check mark to exit extrusion sketch mode. Then I switch to the side view and I am able to rotate the extrusion (I can move it freely as well). Then I click the green check mark to exit the Component creation mode. I can also move the resulting In Place Component.

Please see Posts 4 and 6 for illustrations showing the slopes that are perpendicular to each other.

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Bartholomew

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I’m reminded of that great line out of the 1967 film, Cool Hand Luke: "What we've got here is failure to communicate"

David: you shouldn’t need to rotate the floor in side elevation; you’ve already done that through Modify Sub Elements by changing the elevation values at the points.  

It’s much easier done than explained. Take a look at the attached Revit file.

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David Ewing

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You already sent me that attachement and I replied that that is the idea, but that your 45 deg planes have square edges parallel to a horizontal ground plane, whereas the requirement for my one rear setback has a angled line following grade that is then projected back at 45 deg.

All the other limits you are showing can be represented in elevations and sections by a simple dashed line, without the need for the 3D translucent tent. It's a nice client visualization tool, but I only need to 3D model the rear setback/height limit so I can cut different sections to design under, as it's continuously variable in two directions.

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Bartholomew

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No, David, I didn’t already send you that attachment; I just did it this morning while enjoying my favorite Sunday morning java blend. Have a good day.

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David Ewing

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I apologize, I must have clicked an earlier email link that didn't display your new post, or I didn't go to Page 2 of the thread (this is my time posting here). Thanks for taking the trouble, I think I see what you did, tell me if this is correct:

You made a rectangular floor on a level. You modified the sub-points along the "rear" edge accoding to varying grade, +15'. You did the same to the opposite parallel side, in this case 50' away from the first. You then created a peak half way between them at 25' and added 25' in height to the points along it, to get a 1:1 slope, or 45 deg from the "side" view. No rotation involved.

In my case, this limit is a shed, not a gable, only required going up from the rear, then intersecting with another flat plane height limit 25' above the floor. But I can still apply your method by making the roof deep enough by an arbitrary distance to intersect with the other ht limit.

One other incidental question: how did you lock View 3D-1 so it can't be rotated?

Thanks again!

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