/** Spawn a new branch from the given coords.
*
*/
private function branch(self $branch, $range)
{
$ap = $branch->ap + $range['yaw'] * MtRand::f();
$av = $branch->av + $range['roll'] * MtRand::f();
$len = max(1, $branch->len + $range['length'] * MtRand::p());
$dia = max(1, 2 * $branch->r1 + $range['dia'] * MtRand::p());
return new self($branch->p1, Coords::fromPolar(1, $ap, $av), $len, $branch->r1, $dia / 2);
}
header("Location: {$_SERVER['PHP_SELF']}?seed=" . rand(), true, 302);
}
mt_srand($_GET['seed']);
$p0 = new Coords(632, 53, 40);
$ap = deg2rad(-90);
$av = deg2rad(2);
$len = 28;
$r0 = 4;
$r1 = 3;
$dx = 0;
$dy = 256;
$stem = new BranchTwister();
$stem->setRange(array('yaw' => deg2rad(7), 'roll' => deg2rad(3), 'length' => -5, 'dia' => -1.5))->setLimit(array('dia' => 2));
$branch = new BranchTwister();
$branch->setRange(array('yaw' => deg2rad(6), 'roll' => deg2rad(3), 'length' => -7, 'dia' => -1))->setForce(array('yaw' => deg2rad(50), 'length' => 0.8, 'dia' => -0.7))->setLimit(array('dia' => 1.7));
$trunks[0] = new BranchTrunk($p0, Coords::fromPolar(1, $ap, $av), $len, $r0, $r1);
$trunks[0]->branch = $branch;
$trunks[0]->stem = $stem;
unset($branch, $stem);
$q0[] = $trunks[0];
$white = new Coords(round($p0['x']), round($p0['y']), round($p0['z']));
$red = clone $trunks[0]->red;
$blue = clone $trunks[0]->blue;
for ($n = 0; $n < 6; $n++) {
$q = $q0;
$q0 = array();
foreach ($q as $joint) {
$_t = $joint->next();
foreach ($_t as $trunk) {
$trunks[] = $trunk;
$q0[] = $trunk;
