🚀 go-pugleaf

> The original post mentioned "texture mapping".  What the heck is
> "perspective mapping", and what does it have to do with texture??!!

Perspective mapping has nothing to do with texture mapping.  I didn't coin
the term.  I merely used it from Electronic Arts Deluxe Paint II Enhanced
manual.

> "Texture mapping" is not another term for "3-d line drawing in perspective".
> Texture mapping is where you map a bit-mapped 2-d image (a scanned-in photo,
> for example) onto the surface of a 3-d object (usually a polygon or a group
> of polygons).  I suggest you read "Survey of Texture Mapping" by Paul S.
> Heckbert (Pixar), IEEE CG&A, Nov. 1986.

Haven't read the book.  Texture mapping can be done with a "smart" line
drawing routine.  I wish that I could say more on this matter, but I am
bound by contract on this one.  Sit down with a Bresenham line drawing
routine and play with it.  You'll find that it is suited for texture
mapping, too...even around a spherical object.  Of course, additional
data structures are needed to do something like this, but it works.

Josh