Mail Archives: djgpp/1997/08/03/19:58:32
On 1 Aug 97 at 15:02, David Jenkins wrote:
> So whats a pixel then a 0D object. It doesn't extend in any xy
> directions.
>
> 1D objects = pixels, they don't extend in either xy direction of the
> screen.
>
> 2D objects = lines, they extend in one of the x or y directions.
>
> 3D objects = squares etc, they extend in both x and y directions.
>
> Then again,
>
> 1D objects = pixels and lines, they extend in only 1 of the xyz
> directions.
>
> 2D objects = squares, they extend in 2 of the xyz.
>
> 3D objects = cubes etc, they extend in the xyz.
>
>
> I think it depends on whether your a 2D programmer or a 3D
> programmer.
> Seeing as the subjects Quake like 3D engine programming I guess
> lines
> are 1D in this context.
Hmm, the way I understand it is: a pixel (point) is 0d, a line is 1d,
a plane (square etc) is 2d and a (eg) cube is 3d. However, a point
sits somewhere on a line, that line sits somewhere on a plane
pointing in some direction (or may be curved), that plane lies
somewhere within a volume (cube, sphere, etc) or may be a curved
surface, ad infinitum...
This means that an n dimentional `object' needs n+1 dimentions to
describe it (location, size, etc), thus there is no end to the number
of dimentions (Heinlein, Citizen of the Galaxy, I think)
Mind you, what would the fourth dimention describe? Time? Volume?
Mass? I guess they're all just more dimentions.
Confuzzed ;)
Bill
--
Leave others their otherness.
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