Part authoring scripts and tools

[Tim Gould]

This perl script creates a corner between two cylinders at arbitrary angle, segments and radius.

It and the next script were used to make the tricky bits of this

Code:

use Math::Trig;

## Computes the corner between two cylinders
## or radius $rad at $theta angle with $segs segments

$pi=3.141592635;
$d2r=$pi/180;

## Specify number of segments, angle, radius
$segs=16;
#$theta=55.238*$d2r;
$theta=34.742*$d2r;
$rad=4;

## Masks
$linemask="2 24  %.2f %.2f %.2f %.2f %.2f %.2f\n";
$optmask="5 24  %.2f %.2f %.2f  %.2f %.2f %.2f  %.2f %.2f %.2f  %.2f %.2f %.2f\n";
$trimask="3 16  %.2f %.2f %.2f  %.2f %.2f %.2f  %.2f %.2f %.2f\n";
$quadmask="4 16  %.2f %.2f %.2f  %.2f %.2f %.2f  %.2f %.2f %.2f  %.2f %.2f %.2f\n";

# Internal variables
$thetah=$theta/2;

foreach $n (0..($segs-1)) {
    $phi=$n/$segs*2*$pi;

    $yeff=(1-cos($phi))*$rad;
    $xeff=sin($phi)*$rad;

    $x1=$xeff;
    $y1=$yeff;
    $z1=0;

    $x2=$xeff;
    $y2=$yeff;
    $z2=$yeff*tan($thetah);

    $x3=$xeff;
    $y3=$yeff*cos($theta);
    $z3=$yeff*sin($theta);

    $pts1->[$n]=[$x1,$y1,$z1];
    $pts2->[$n]=[$x2,$y2,$z2];
    $pts3->[$n]=[$x3,$y3,$z3];
}

foreach $n (0..($segs-1)) {
    $np=($n<($segs-1))?($n+1):0;
    $nm=($n>0)?($n-1):($segs-1);

    $x10=$pts1->[$n][0];
    $y10=$pts1->[$n][1];
    $z10=$pts1->[$n][2];

    $x20=$pts2->[$n][0];
    $y20=$pts2->[$n][1];
    $z20=$pts2->[$n][2];

    $x30=$pts3->[$n][0];
    $y30=$pts3->[$n][1];
    $z30=$pts3->[$n][2];

    $x1p=$pts1->[$np][0];
    $y1p=$pts1->[$np][1];
    $z1p=$pts1->[$np][2];

    $x2p=$pts2->[$np][0];
    $y2p=$pts2->[$np][1];
    $z2p=$pts2->[$np][2];

    $x3p=$pts3->[$np][0];
    $y3p=$pts3->[$np][1];
    $z3p=$pts3->[$np][2];

    $x1m=$pts1->[$nm][0];
    $y1m=$pts1->[$nm][1];
    $z1m=$pts1->[$nm][2];

    $x2m=$pts2->[$nm][0];
    $y2m=$pts2->[$nm][1];
    $z2m=$pts2->[$nm][2];

    $x3m=$pts3->[$nm][0];
    $y3m=$pts3->[$nm][1];
    $z3m=$pts3->[$nm][2];

    printf($linemask,
       $x20, $y20, $z20,
       $x2p, $y2p, $z2p);
    if (($x10!=$x30) || ($y10!=$y30) || ($z10!=$z30)) {
    printf($optmask,
           $x10, $y10, $z10, $x20, $y20, $z20,
           $x1p, $y1p, $z1p, $x1m, $y1m, $z1m);
    printf($optmask,
           $x30, $y30, $z30, $x20, $y20, $z20,
           $x3p, $y3p, $z3p, $x3m, $y3m, $z3m);

    printf($quadmask,
           $x1p,$y1p,$z1p,$x10,$y10,$z10,
           $x20,$y20,$z20,$x2p,$y2p,$z2p);
    printf($quadmask,
           $x2p,$y2p,$z2p,$x20,$y20,$z20,
           $x30,$y30,$z30,$x3p,$y3p,$z3p);
    }
    else {
    printf($trimask,
           $x1p,$y1p,$z1p,$x10,$y10,$z10,
           $x2p,$y2p,$z2p);
    printf($trimask,
           $x2p,$y2p,$z2p,
           $x30,$y30,$z30,$x3p,$y3p,$z3p);
    }
}