I seem to be misunderstanding today, because rotating (0,1,0) by -90
around the X axis gives me (0,0,-1)
http://screencast.com/t/AdsSEDqN1wpa
On 21/02/2013 10:10 AM, Peter Agg wrote:
Ah yeah, sorry. That was just a correction to my original example.
On 21 February 2013 15:02, Stephen Blair <[email protected]
<mailto:[email protected]>> wrote:
Sorry, I was confused by this:
"(and yes, rotating [0, 1, 0] by [-90, 0, 0] should actually make
make [0, 0, -1]) :)"
On 21/02/2013 9:46 AM, Peter Agg wrote:
Hum, seems to be giving me the same result.
vec = XSIMath.CreateVector3(0, 1, 0)
rot = XSIMath.CreateRotation()
rot.SetFromAxisAngle( XSIMath.CreateVector3(1.0, 0.0, 0.0),
XSIMath.DegreesToRadians( -90 ) )
vec.MulByRotationInPlace( rot)
print vec.X, vec.Y, vec.Z
# 0.0 6.12323399574e-17 -1.0
On 21 February 2013 14:31, Stephen Blair <[email protected]
<mailto:[email protected]>> wrote:
vec = XSIMath.CreateVector3(0, 1, 0)
#rot = XSIMath.CreateRotation(XSIMath.DegreesToRadians( -90 ),
# XSIMath.DegreesToRadians( 0 ),
# XSIMath.DegreesToRadians( 0 ))
rot = XSIMath.CreateRotation()
rot.SetFromAxisAngle( XSIMath.CreateVector3(1.0, 0.0, 0.0),
XSIMath.DegreesToRadians( -90 ) )
vec.MulByRotationInPlace( rot)
print vec.X, vec.Y, vec.Z
# 0.0 6.12323399574e-17 -1.0
On 21/02/2013 9:21 AM, Peter Agg wrote:
(and yes, rotating [0, 1, 0] by [-90, 0, 0] should actually
make make [0, 0, -1]) :)
On 21 February 2013 14:15, Peter Agg
<[email protected] <mailto:[email protected]>>
wrote:
Hey all,
I'm trying to rotate a vector in a Python Script and
seem to be running into an odd block. For example: I
want to rotate the vector [0, 1, 0] by [-90, 0, 0],
which should make [-1, 0, 0] (and does so if I test in
ICE using a Rotate Vector node) but I can't seem to work
out how to do this via scripting.
What I tried:
vec = XSIMath.CreateVector3(0, 1, 0)
rot = XSIMath.CreateRotation(XSIMath.DegreesToRadians(
-90 ),
XSIMath.DegreesToRadians( 0 ),
XSIMath.DegreesToRadians( 0 ))
vec.MulByRotationInPlace( rot)
print vec.X, vec.Y, vec.Z
# 0.0 6.12323399574e-17 -1.0
...which makes me think that I've misunderstood what
MulByRotation does!
Any ideas?
