transform riddle 2004-01-30 - By Neto
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Just adding...
When you spply another transform to a vector that had a transform applied to
it, the new transform will override the old one. It's bizarre, but that how
it works.
For performance's sake, I keep a global called "gZeroVector" to use when
doing transform with vectors (creating a vector everytime can be expensive).
-- -- Original Message -- --
From: "James Newton" <james.newton@(protected)>
To: <dir3d-l@(protected)>
Sent: Friday, January 30, 2004 2:26 PM
Subject: Re: [Dir3d-l] transform riddle
> On 30/1/04 3:02 pm, "Thomas Westin" <thomas.westin@(protected)> wrote:
>
> > Can someone explain why the result of X3 is not vector(5,7,9) ?
> >
> > A = TRANSFORM()
> > A.TRANSLATE( 1,2,3)
> > X1 = VECTOR( 3,3,3)
> > X2 = A*X1
> > X3 = 0
> > X3 = A*X2
>
> Hi Thomas,
>
> There is a bug in Director concerning the operation (transform * vector).
> Here is the workaround:
>
> A = TRANSFORM()
> A.TRANSLATE( 1,2,3)
> X1 = VECTOR( 3,3,3)
> X2 = A*X1 + vector(0,0,0)
> X3 = 0
> X3 = A*X2
>
> put x3
> -- vector( 5.0000, 7.0000, 9.0000 )
>
> Cheers,
>
> James
>
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