RE: [Algorithms] Oriention from Normal

[Chris B. (BUNGIE) <cbu...@mi...>]

> -----Original Message-----
> From: Ratcliff, John [mailto:jra...@so...]
> Sent: Wednesday, February 27, 2002 16:18
> To: Chris Butcher (BUNGIE); gda...@li...
> Subject: RE: [Algorithms] Oriention from Normal
>=20
> Hmmmm..how about just doing this?  At least that's why our new AI guy, =
Scott
> Martin, added to our math libraries today:
>=20
> 		euler.x =3D 0;                         // roll
> 		euler.y =3D acosf(normal.z);            // pitch
> 		euler.z =3D atanf(normal.y, normal.x);  // yaw
>=20
> ???
>=20
> If you are going to be working in euler co-ordinates as a generalized
> representation that is.  And going from euler to quat is easy enough.
>=20
  Sure, that works, although it's almost certainly slower. Be very wary =
of slightly-out-of-range values in normal.z if you're passing it to =
acosf directly.

--
Chris Butcher
AI Engineer | Halo
Bungie Studios
bu...@bu...