From: Mark Evans (mrrevans++at++yahoo.com)
Date: 12/19/2000 05:19:24
I have a complex scene with a lot of billboards (more
than 5K) and therefore I didn't use pfBillboards but
instead pfDCSs - to be able to modify the rotation
angle selectively, based on distance.
I have a function that computes the angle of rotation
for every pfDCS (associated with a billboard), and
also
sets this angle in the pfDCS matrix - so everything is
done in this function. The function takes aprox. 7 ms
every frame, yet, the frame time increases by aprox 22
ms - and the statistics reports that the App step
duration is increased by this amount.
My question is: where does the difference (22 ms - 7
ms) come from? Is it because Performer recomputes the
bounding boxes/speres for the pfDCSs that have the
rotation modified from one frame to another? Is there
other reason? Does the pfBillboard bring advantages
over using pfDCSs for many billboards?
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This archive was generated by hypermail 2b29 : Tue Dec 19 2000 - 05:19:29 PST