private static interpolateColor ( $size, $x, $z, $c1, $c2, $c3, $c4 ) |
private static function interpolateColor($size, $x, $z, $c1, $c2, $c3, $c4)
{
$l1 = self::lerpColor($c1, $c2, $x / $size);
$l2 = self::lerpColor($c3, $c4, $x / $size);
return self::lerpColor($l1, $l2, $z / $size);
}