Rudi Schmidt (Rudolf++at++Schmidt.net)
Thu, 28 Oct 1999 20:45:30 +0200
I'm having trouble understanding some phenomenon in Performer's
pixelfill-statistics.
I am running a driving-database (town) in perfly on an Onyx2-IR,
single-channel
For specific positions in the database, I need to measure the number of
pixel-draws, or -equivalently- the average depth complexity (=DC) of the
scene.
My phenomenon now is, that I get different values for DC depending on
the visual chosen -at exactly the same database position !
The visuals I am testing are all double-buffered, 10bit RGB, 8-fold
multisampled and Z-buffered. The only difference is the number of
stencil-planes, and the depth of the z-buffer.
To give an example of the degree of deviations: the DC-value might be
of value 2.5 with one visual, and DC=2.85 (at the same position) with
another visual.
I am certainly aware, that Performer could use stencil-planes for
accumulating the number of pixel-visits, but the difference I am seeing
must have some reason, or at least an explanation !
Now my questions:
1. CAN SOMEBODY MAKE SENSE OUT OF THAT, AND EXPLAIN WHAT IS GOING ON
THERE ?
2. WHICH VISUAL GIVES ME THE CORRECT, ACTUAL DC-VALUE ? IS IT THE ONE
WITH 8 BITS STENCIL (which is my suspision ! )?
-- Rudi
--------------------
Rudolf Schmidt
Geltendorf (Munich)
mailto:Rudolf++at++Schmidt.net (home)
mailto:Rudolf.Schmidt++at++KMWeg.de (office)
-----------------------------
This archive was generated by hypermail 2.0b2 on Thu Oct 28 1999 - 11:45:32 PDT