Re: Rotate a 3D vector

[true]

Back to the trenches with me. I'm starting with a 2d space till i can wrap my head around it. The code and examples i am finding are not matching up in 3d space. Here's my closest attempt which still is wrong. Can anyone help?

# 2 points on a plane
my $x = 2;
my $y = 1;
#yang is the y-angle 0-360 i want to rotate by
my $yang = 45;
#convert yang to radians
$yang = 3.14159265358979*$yang/180;
#rad is the radius of my sphere
my $rad = sqrt($x**2 + $y**2);
my $x = cos($yang)*$rad;
my $y = sin($yang)*$rad;
print "x=$x\ny=$y\n";

Advice appreciated.

[johnnywang]

Just a little change, the formula was not correct (as I pointed out in my previous post in this thread)

# 2 points on a plane
my $x = 2;
my $y = 1;
#yang is the y-angle 0-360 i want to rotate by
my $yang = 45;
#convert yang to radians
$yang = 3.14159265358979*$yang/180;
my $xnew = cos($yang)*$x - sin($yang)*y;
my $ynew = sin($yang)*$x + cos($yang)*y;
print "x=$xnew, y=$ynew\n";