|
 |
"Rune" <new### [at] runevision com> wrote:
> If you want to make an object stay in the same place in your scene, but
> point at the location where the camera is, then you don't want to use the
> camera transform at all. Instead you should look at the macros
> Reorient_Trans() or Point_At_Trans() from transforms.inc (see 3.6.18
> transforms.inc in the POV-Ray documentation). You still need to know the
> location of the camera though.
Good point. I've been trying to use these two macros, but they seem a bit
under-determined for my needs. These only align a single axis of an object
to point at a certain point, but the object remains free to "spin" about
that axis. I'm trying to figure out a way to also specify an "up" vector
for an object such that when the object is pointed at a given point, that
"up" vector is parallel (in the viewing plane) to the Y-axis.
That is, I'm looking for some sort of "look_at" / "up" transform for objects
that is directly analogous to that available for the camera. I tried
writing an equivalent of gluLookAt as a SDL macro, but that doesn't seem to
quite work. Does anyone have any suggestions?
Zach
Post a reply to this message
|
|
