JOHNNY! That's awesome! I was coming up with the same math, but simplifying it to lines as you did sure makes it much easier to comprehend.

The project I'm working on is due in presentation format tomorrow, so I won't try re-doing this until after it's submitted. However, if my project is selected, I may float this concept by an engineer to see if it would fly. With some cross members, I wouldn't see why not.

Thanks! (Fun little geometrical challenge, huh?)

Have you worked on many reciprocal roofs?

Hi Jean. It is intentional. However, it is likely easier to construct the thing using a horizontal circle, and then rotate that circle, and extrude the individual members afterward, no?

I've designed myself into a bit of a challenge. Have found some good, but old youtube vids about reciprocal roofs. My design, however, has the opening in the roof off-center. I have no idea if this could happen structurally, but it seems that it must be possible to at least construct in sketchup... provided each structural member has a specific angle.

In the attached file, you will see my intended roof form, the flat geometry, and the structural components ALL at a 45 degree angle. Of course, due to the off-center opening, the components do not meet each other.

My question is more a question of math/geometry: how would I calculate the angle of each component in order to make them all hit each other at the top opening?

Model 54.skp

Hi all. I have a thesis book due in 48 hours! ugh.

I have a model with a terrain that was done using the From Countours. Problem is that when I do a section of my model, the terrain outline doesn't show. How can I show this outline?

Chris, I'm having a problem with the Camera Recorder. Everything works fine up til I try to export he images. I see it says "Exporting X of X images", but the program stops at that.

Once, I did get two images exported before it stopped (then I got a "Sketchup is not responding").

I do have a skydome in the model, but the animation is working fine. Thanks.