#TRANSPARENT PAN PROBLEM
3 messages in this thread
Display list redraws will always be faster than REGENs (under AutoCAD,
that is). What your question boils down to is "On what speed system will
REGENs and DL Redraws be perceived as being instantaneous?"
My answer would be: On a 200 MHz 586 with a 5ms hard disk (with 512 MB
hardware disk cache) attached directly to the CPU.
In other words, a long time from now.
Jake
Thanks for the reply; I guess that I was looking at the problem a bit
differently. If you have the Dbl precision FP database in systems memory,
say with 32 Mbyte of systems RAM, and you can transform each entity (on the
FP coprocessor) in less time than it takes to draw, isn't that equivalent
to DL redraw? Come to think of it, why don't you improve ACAD by using the
ADS language to fetch the entities directly, thereby eliminating the
intermediate step of converting them to integer representations. Then you
could do zooms and pans without 16 bit restrictions?
To do it via interpretation of the ACAD DB is tediously slow, plus there is
no good way to inform ACAD of visual representation changes without having
ACAD do them itself.
Our integer transformations are faster than FP equivalents would be, BTW.
So your approach, while speeding things up, would still not be as fast. In
some cases, we don't even need to do any transformations.
Jake