# 3dscene.pm
use Slic3r::GUI::ColorScheme;
sub new {
    my ($class, $parent) = @_;
    Slic3r::GUI::ColorScheme::getMODColorScheme();
    glColor4f( @SELECTED_COLOR , $volume->color->[3]); # this should be like: glColor4f(0.82745,0.21176,0.50980, 1);
    # glColor4f(@{ @SELECTED_COLOR }, $volume->color->[3]); # this does not work at all! 
    # ERROR from line above: Can't use string ("1") as an ARRAY ref while "strict refs" in use
}