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Re: Rotate a 3D vector

by true (Pilgrim)
on Oct 18, 2004 at 02:59 UTC ( [id://400038]=note: print w/replies, xml ) Need Help??


in reply to Rotate a 3D vector

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";

[download]
Advice appreciated.
jtrue

Replies are listed 'Best First'.
Re^2: Rotate a 3D vector
by johnnywang (Priest) on Oct 18, 2004 at 03:57 UTC
    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";

    [download]
[reply]
[d/l]

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