Hi there!

Here is an attempt for a macro to build a rope that follows a spline using
blob objects. I think the result is quite satisfactory and fast. I post the
corresponding include file and the sample scene in p.b.s-f.

   Regards.

     Bruno

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Preview of image 'rope.jpg'

"Bruno Cabasson" <bru### [at] alcatelaleniaspacefr> wrote:
> Hi there!
>
> Here is an attempt for a macro to build a rope that follows a spline using
> blob objects. I think the result is quite satisfactory and fast. I post the
> corresponding include file and the sample scene in p.b.s-f.
>
>    Regards.
>
>      Bruno

One slight nitpick and over-analyzation.  Your rope has been defined with a
"lang lay" twist (http://www.dcl-usa.com/wire_rope/).  That is the
individual strands twist in the same direction as the strand groups.  This
is not a common way to make rope and is susceptible to twisting and
unraveling.  The more common (especially in regular rop as opposed to wire
rope) type is the regular lay, where the strands twist opposite the strand
groupings, resitsting unraveling.

Probably more information than you ever needed to know about rope...

-tgq

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"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> "Bruno Cabasson" <bru### [at] alcatelaleniaspacefr> wrote:
> > Hi there!
> >
> > Here is an attempt for a macro to build a rope that follows a spline using
> > blob objects. I think the result is quite satisfactory and fast. I post the
> > corresponding include file and the sample scene in p.b.s-f.
> >
> >    Regards.
> >
> >      Bruno
>
> One slight nitpick and over-analyzation.  Your rope has been defined with a
> "lang lay" twist (http://www.dcl-usa.com/wire_rope/).  That is the
> individual strands twist in the same direction as the strand groups.  This
> is not a common way to make rope and is susceptible to twisting and
> unraveling.  The more common (especially in regular rop as opposed to wire
> rope) type is the regular lay, where the strands twist opposite the strand
> groupings, resitsting unraveling.
>
> Probably more information than you ever needed to know about rope...
>
> -tgq

No problem, I just have to add a minus sign ... Here is the result.

   Thanks

      Bruno

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Attachments:
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Preview of image 'rope.jpg'

That is interesting. I would not have been able to point out what was wrong
in the first image, but the second is visually more acceptable - even
through the lay of the rope is stiffer, it looks more 'ropey'. It's amazing
what our eyes pick up and don't tell us about.

-s
5TF!

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"stm31415" <sam### [at] cscom> wrote:
> That is interesting. I would not have been able to point out what was wrong
> in the first image, but the second is visually more acceptable - even
> through the lay of the rope is stiffer, it looks more 'ropey'. It's amazing
> what our eyes pick up and don't tell us about.
>
> -s
> 5TF!

It was an attempt to use blobs for ropes. It is a first version, but the
macro is already quite versatile, and may be used for many cases. I am
satisfied.
I played with parameters and some results are funny. Here is another render
(I wanted to make the five olympic rings, but I suddenly found myself very
lazy ...)

    Regards

      Bruno

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Preview of image 'rope.jpg'