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Please see the attached downloadable RAR archive file. It contains all necessary
files.
PROBLEM
I am developingm an authentic classical Roman ballista. Those are the
predecessors of the later guns. They use the energy that rope fibers can store.
The ballista is not finished yet, but I am not able to create those twisted
ropes, after one entire day of fruitless attempts. I cannot manage the spline
object, that's the problem.
The attached archive contains a folder called "Example", there you can find a
graphic that shows what is needed (the twisted brown ropes left and right).
If here's anyone who has the ability to help me out, it would be great! All
POV-Ray scene-related files are inside the other three folders.
As a small Thank You for your time, intention and efforts, the archive also
contains another folder by the name of "PCP" - this means "POV-Ray Color Picker"
(for Windows), and lets you select colors and converts them into POV-Ray code.
Very useful.
Please don't hes to ask me, if you have questions. Big thanks.
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Attachments:
Download 'ballista 001.rar.dat' (2487 KB)
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Hi BaldEagle,
nice hearing again from you, and thanks for yout time.
It is not quite a wraping around the cylinder that I need, it is several ropes
pushed sideways where the horizontal arm extends from the vertical cylinder.
This is something that I cannot do with my current level of POV-skills. I am,
actually, quite desperate and frustrated. :-)
I believe it would be easier to use another render software with a WYSIWYG
editor, and simply visually push the individual ropes sideways, some more, some
less, some not. And then to export that object as mesh for POV-Ray. But I do not
have any other render software on this machine, and I am at the hospital
rightnow, data through mobile phone is expensive. Cannot downloaDo you know of
any way to achieve a solution for the rope problem? I imagine, the sphere-sweep
spline or other splines can be the solution, but I have no understanding of them
and always get bad results. I cannot control their directions die lack of
understanding.
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Hope this helps.
The vertical cylinder where the ropes go around has a diamter of 0.25 and a
height from < 0.0, 0.0, 0.0 > to < 0.0, 2.7, 0.0 >.
The arm separates from the middle of the cylinder#s height and has an own radius
of 0.2 there.
Excerpt:
union // sling arm
{
cylinder { < 0.0, -0.2, 0.0 > < 0.0, 2.5, 0.0 > 0.25 texture { TopColor rotate
< 90.0, 0.0, 0.0 > } }
cone { < 0.0, 1.15, 3.0 > 0.15 < 0.0, 1.15, 0.0 > 0.2 texture { TopColor } }
box { < 0.0, 1.00, 3.0 > < 0.18, 1.30, 2.5 > texture { RustyIron } }
cylinder { < 0.0, 1.15, 3.0 > < 0.0, 1.15, 2.9 > 0.17 texture { RustyIron }
}
cylinder { < 0.0, 1.15, 2.7 > < 0.0, 1.15, 2.6 > 0.18 texture { RustyIron }
}
torus { 0.15, 0.05 translate < 0.18, 1.15, 2.75 > texture { RustyIron } }
sphere { < 0.0, 1.15, 3.0 > 0.15 texture { RustyIron } }
torus { 0.05, 0.025 rotate < 90.0, 0.0, 0.0 > translate < 0.33, 1.15, 2.75 >
texture { Rope } } // // ropes around rings
cylinder { < 0.33, 1.15, 2.75 > < 4.19, 1.275, 3.7825 > 0.025 texture { Rope
} }
rotate < 0.0, 55.0, 0.0 >
translate < -1.5, 0.0, 1.32 >
}
The first cylinder is the vertical one (rope skein), and the first cone is the
arm.
The ropes need to have a cross-section radius larger tan 0.025, maybe 0.030 or
0.035 maximum.
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net> wrote: