I have to be pedantic here... the eye can most _certainly_ detect
movement beyond 60 hz. But there is no point in displaying faster than
that if your display can't render faster than 60 hz.
There are good reasons to do so, though. For example, to test rendering
speed to get good benchmarking for seeing how much CPU your rendering
code is wasting. Alternately, there are certain situations where one
may be driving sensing equipment that wants higher refresh. Of course,
then the display is expecting that refresh or whatever is receiving the
output... so we still come back to driving your display at what your
display expects. Or benchmarking.
-Paul
Philip Taylor wrote:
Wyatt,
Out of very idle curiosity, why would you render at 2KHz when the eye can't
really detect movement beyond 60Hz?
Would it just be for rendering individual frames for a movie?
PhilT
-----Original Message-----
From: [email protected]
[mailto:[email protected]]on Behalf Of Wyatt
Earp
Sent: 11 July 2009 19:08
To: OpenSceneGraph Users
Subject: Re: [osg-users] frame rate faster than monitor vsync?
I have renderered in excess of 2 KHz on ocassion.
Wyatt
On 7/11/09, Ulrich Hertlein <[email protected]> wrote:
Hi Bob,
On 10/7/09 9:05 PM, Bob Youmans wrote:
Hi, does anyone know if it’s possible to run faster than the 60Hz vsync
or 100Hz osg limit, if computational performance is the ultimate goal
even at the expense of “tearing.” Can I get 600 fps by turning off vsync
(or something else, it didn’t work on my box)? Is the graphics card
driver/model involved? How can you tell which ones will work without
actually buying it?
If you turn off vsync then OSG will render as fast as possible, without
any
artificial
limitation. There's no 100 Hz OSG limit that I'm aware of except maybe in
the DB pager.
Sure you can get 600 fps if you're willing to accept tearing (or render
offscreen), even
my GeForce 8600M GT laptop gives me over 1000 fps for moderately complex
models. And yes,
the graphics card is obviously involved (the faster the better) and so is
the driver.
If you're not seeing more than vsync fps then the reason is most likely
due
to setup, e.g.
a driver settings forcing vsync on or __GL_SYNC_TO_VBLANK being set on
Linux.
Cheers,
/ulrich
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