In article <487d9a7a@news.povray.org>, sco### [at] scottcom says...
> > This however, rotating on the
> > Y axis, goes nuts:
> 
> If you're rotating only the y axis (ie Rot.x and Rot.z are zero), then th
e y 
> coordinate shouldn't change.
> 
> >        y2 = llCos(Rot.x* DEG_TO_RAD)*y - llSin(Rot.x* DEG_TO_RAD)*z;
> 
> Since Rot.x is zero, the above line is equivalent to y2 = y
> 
> >        y = y2;
> 
> Obvious.
> 
> >        y2 = llSin(Rot.z* DEG_TO_RAD)*x + llCos(Rot.z* DEG_TO_RAD)*y;
> 
> Again, since Rot.z should be zero here, this line is again equivalent to 
y2 
> = y
> 
> > [22:41]  Object: <1.00000, 1.00000, 1.00000>
> > [22:41]  Object: <0.99969, 1.01760, 1.00000>
> 
> I would suggest you check the values of Rot.x and Rot.z in your code, and
 
> also the xyz coords after each rotation - none of them should modify the 
y 
> coordinate if only Rot.y is non-zero.
>  

Ok. First off, I am an idiot. The code is based on rotating an object at 
a known point, so in theory, I should, I think, always start x,y,z at 
1,1,1, the "start point", where the object was in the first place. That 
may be having some effect, otherwise, I need to only rotate it by N 
degrees every time, not "increase" N each pass. I suppose that "may" be 
causing this odd behavior somehow, though, I can't imagine how, since 
the vector length for any point on a rotation starting at 1,1,1 *should 
be* the same, no matter what position the object occupies, i.e., the 
vector length should still average to a line length of "1", not 3, or 
what ever it comes out to.

It also seems damn strange to me, if the rotation values where causing 
it, for Y to be producing that effect, either by itself, or combined 
with any other values.. Hmm.. Will have to get back to you on what 
happens when I fix the goof I made in trying to "read" the position 
every time, instead of once, but that will be tomorrow. Its after 2am as 
of posting this, and I was half asleep when I realized what one of the 
places I had screwed up was. lol

-- 
void main () {

    if version = "Vista" {
      call slow_by_half();
      call DRM_everything();
    }
    call functional_code();
  }
  else
    call crash_windows();
}

<A HREF='http://www.daz3d.com/index.php?refid=16130551'>Get 3D Models,
 
3D Content, and 3D Software at DAZ3D!</A>

Post a reply to this message