POV-Ray : Newsgroups : povray.newusers : Two questions about texture bitmaps : Re: Two questions about texture bitmaps Server Time
5 Oct 2024 15:53:36 EDT (-0400)
  Re: Two questions about texture bitmaps  
From: clipka
Date: 20 Aug 2009 14:37:35
Message: <4a8d97ef$1@news.povray.org>
Timwi schrieb:
> Question #1:
> How do I use a simple bitmap file as a simple texture on a simple box? 
> Sounds simple, doesn't it?
> 
> Question #2:
> Why is there absolutely nothing about this in any documentation, 
> anything Google can find, no working examples, nothing?

Answer #1 and #2:

Check out section 3.5.1.5 "Image Maps" in the documentation.

As for mapping this onto a box, that section provides a general 
description of how the image is mapped into 3D space (by default), which 
should be so darn easy to adapt to mapping it onto a box that probably 
authors of documentation and sample scenes deemed it too trivial to 
provide examples:

-----------------------
By default, the image is mapped onto the x-y-plane. The image is 
projected onto the object as though there were a slide projector 
somewhere in the -z-direction. The image exactly fills the square area 
from (x,y) coordinates (0,0) to (1,1) regardless of the image's original 
size in pixels. If you would like to change this default you may 
translate, rotate or scale the pigment or texture to map it onto the 
object's surface as desired.

In the section "Checker", the checker pigment pattern is explained. The 
checks are described as solid cubes of colored clay from which objects 
are carved. With image maps you should imagine that each pixel is a 
long, thin, square, colored rod that extends parallel to the z-axis. The 
image is made from rows and columns of these rods bundled together and 
the object is then carved from the bundle.
-----------------------


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