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Am 17.06.2011 07:51, schrieb simplyfabio:
> clipka<ano### [at] anonymous org> wrote:
>> Am 16.06.2011 22:01, schrieb simplyfabio:
>> (6) if you have any /specific/ questions or problems, ask here.
>>
>>
>> Don't expect anyone here to do your homework for you.
>
> Thanks for reply!
> Then, i know thatt anyone make it for me! I've only asked some help input to
> follow and try by myself.
Sorry if I sounded excessively harsh, but your original posting was
pretty unspecific; now this:
> I've studied it, and The only thing where i found problem is write a function
> for one of that "arms". It is like a parabolic arc curved in two dimension, or a
> sinxsinx function from 0 and pi/2 and mirrored... I don't know....
... is what I'd call a specific question.
It seems to me that the "nodes" in the roof lie on circles having a
constant distance to one another, so that's what I'd try as a first
approach; i.e., each arc would follow a curve defined by:
y = sin(alpha)
x = cos(alpha) * cos(beta)
z = cos(alpha) * sin(beta)
beta = alpha * const1 + const2
where alpha is the "elevation" angle, and beta is the angle of rotation
about the vertical. const1 would be the same for all arcs, while const2
would be different for each arc
Of course the coordinate origin would be way below the surface.
If that turns out to not match the geometry, here's a few other
approaches that might make some sense:
- Presume that the "nodes" lie on circles having a constant /horizintal/
distance to each other, and that they lie on a sphere.
- Presume that the "nodes" lie on circles having a constant /horizintal/
distance to each other, and that they lie on a parabola.
- Presume that the distances between any two nodes on the same arc are
constant, and that they lie on a sphere.
- Presume that the distances between any two nodes on the same arc are
constant, and that they lie on a parabola.
In any case, it is a pretty safe bet that the roof is either a spherical
section or - actually even more likely - a parabola.
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