Re: Double-Precision, Large-Area Databases, and SIGGRAPH

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Angus Dorbie (dorbie++at++sgi.com)
Wed, 05 May 1999 18:37:47 -0700

Michael T. Jones wrote:
>
>
> Perhaps the problem is confusion about the fact that only
> the special tile near the eyepoint avoids relocation in method
> B; the other tiles *are* translated using a matrix as in method
> A

>
> Are Angus and I the only ones struggling for clarity here?

This clarifies things for me, since the scope of the bound box saving is
limited to the local tile. My confusion arose from a perception that the
original description was claiming it could generally eliminate the
modeling translation above the scene graph. Upon enlightened
reexamination this was not your intent and should have been clear to me
from your previous post.

Even if you can't fool me I can sure fool myself, sorry.

In practice this saving could be highly variable. During the regular
occurrence of approaching the edge of two tiles, or the corner of four,
only one tile would be selectable as the local cell.

Cheers,Angus.

-- 
"Microsoft's system was like a forest that hadn't had a controlled
 burn in decades, just waiting for one person with a match to turn
 it into a disaster. Melissa was Microsoft's fault. They left their
 system wide open to this sort of abuse, they knew it could happen
 and did nothing." -- Bruce Perens


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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