🚀 go-pugleaf

In article <1992Aug5.195205.5840@esds.mdc.com> bonney@esds.mdc.com (Greg Bonney) writes:
>In article <1992Aug5.172543.3507@esds.mdc.com> bonney@esds.mdc.com (Greg Bonney) writes:
>>The original post mentioned "texture mapping".  What the heck is
>>"perspective mapping", and what does it have to do with texture??!!
>>"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.
>
>Before I get any more e-mail on this topic, I apologize for jumping the gun
>before I saw the code.  I haven't tried it yet, but I guess it's pretty obvious
>he does know what texture mapping is.  I would like somebody to explain, though,
>how his code resembles a simple line drawing algorithm.  I would also like to
>hear some comments on the limitations of this method.  

Josh's program redraws the bitmap a raster at a time, using Bresenham's
line algorithm to "tilt" each raster so that they all point to a 
vanishing point.  Rotation can also be accomplished in a similar manner
by drawing each raster with a tilt, but keeping them all parallel.

Phat.