"Kenneth" <kdw### [at] gmailcom> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:
> >
> > {Illusion.inc] is basically a different
> > way of applying an image_map to objects-- but from the camera's viewpoint, and
> > with a rather magical matrix manipulation that alters the 'depth perspective'
> > of the applied image.
> >
>
> It essentially applies the image_map as an 'orthographic' projection onto scene
> objects, devoid of perspective... which is quite different from a typical
> map_type 0 projection.

So, I spent a bit of time working out how to do the "this object always faces
the camera" thing, and it's essentially what gets done in screen.inc, minus the
final translation.

Compare that to Rune's "rather magical matrix manipulation" and you'll see that
it's basically the same thing.

So it looks to me that what's going on is, the image gets oriented to be
perpendicular to the camera / parallel to the image plane, and the divisions by
z in the image function are there to provide the appropriate scaling of the
image depending upon where it gets mapped to.

- BW

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