Re: Object data

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ceti (ceti++at++worldnet.net)
Wed, 08 Jan 1997 12:44:13 +0000

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>Hi all,
> I just used the function pfPrint to print out the data under the
>dcs that I am currently at and to my surprise, the coordinates that were
>printed for the object was the same although I had moved the object by the
>trackball movements. Why is this so?

When moving using a DCS ( or whatever you wanted ) you move the object by
pushing a transformation matrix ( scale , rotation, translation ) in the
viewing stack.
When rendering, the machine computes the new coordinates using object's ones
and transfo matrix's ones to place polygons at their right place.
The machine never replace objects coordinates at any time.
==================================================================
      _/_/ _/ _/_/_/ _/ _/ _/_/_/ _/_/_/ _/_/_/
    _/ _/ _/ _/ _/ _/ _/ _/ _/ _/
   _/ _/ _/ _/ _/ _/ _/ _/_/_/ _/_/_/
  _/ _/ _/ _/ _/ _/ _/ _/ _/ _/
  _/_/ _/_/_/ _/_/_/ _/ _/_/_/ _/_/_/ _/ _/

     BILLARD Olivier - Ingineer R&D - C&I Software
     1 avenue de la mer - 44380 PORNICHET - FRANCE
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  Email: ceti++at++worldnet.net URL:http://www.worldnet.net/~ceti
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