Subject:
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Re: LSynth electric cable cross section oriention problem
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 26 Nov 2006 16:06:12 GMT
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Viewed:
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2621 times
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In lugnet.cad.dev, Kevin L. Clague wrote:
> I've got up/side/front vector stuff working now, so that I can control the
> orientation of cross sections of electrical cables at the start of a segment
> defined by two constraints.
>
> My issue now is that I don't know how to force the twist so that the electrical
> cable cross sections at the end of a segment (at the second constraint) are
> aligned with the second constraint.
>
> I can get the start to look good, but don't know how to make the ends line up
> correctly.
>
> Constraint->crossection|crosssection|crosssection->Constraint...
>
> The first cross sections are properly aligned with the first constraints, but
> the ending cross sections are not aligned with the second constraint.
>
> Anyone have any ideas on what to do to have the end be properly constrainted?
>
> Kevin
Leo,
In case you didn't get this far, I solved the above problem and can now
control twist all through a cable segment from start point to end point.
I calculate the up vector for the start of segment, and the up vector for the
end of segment. I also calculate the entire length of the segment.
At each new cross section, I calculate how far we are down the total length,
and calculate the current up vector based on the start_up, end_up, and
current_length/total length.
normalized = current_length/total_length;
up[0] = start_up[0]*(1-normalized) + end_up[0]*normalized; // x
up[1] = start_up[1]*(1-normalized) + end_up[1]*normalized; // y
up[2] = start_up[2]*(1-normalized) + end_up[2]*normalized; // z;
normalized = sqrt(up[0]*up[0]+up[1]*up[1]+up[2]*up[2]);
up[0] /= normalized;
up[1] /= normalized;
up[2] /= normalized;
Kevin
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Message has 1 Reply:
 | | Re: LSynth electric cable cross section oriention problem
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| (...) Hi Kevin, Another possibility to investigate is to change the up vector in inverse proportion to the bezier curve change. That would mean it would twist less where there's a sharper bend, and would possibly end up looking more authentic. But (...) (18 years ago, 26-Nov-06, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: LSynth electric cable cross section oriention problem
|
| I've got up/side/front vector stuff working now, so that I can control the orientation of cross sections of electrical cables at the start of a segment defined by two constraints. My issue now is that I don't know how to force the twist so that the (...) (18 years ago, 24-Nov-06, to lugnet.cad.dev)
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