Ah yeah, sorry. That was just a correction to my original example.
On 21 February 2013 15:02, Stephen Blair <[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]> 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]> 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? >>> >> >> >> > >
