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<div class="moz-cite-prefix">Am 22.07.2015 um 14:12 schrieb Trajce
Nikolov NICK:<br>
</div>
<blockquote
cite="mid:CAO-+zi=y2v5=XtpzKrQK9CfPGqzS0NhhOszrQPADHAMmfa-DBw@mail.gmail.com"
type="cite">
<div dir="ltr">Hi Sebastian,
<div><br>
</div>
<div>few months ago I tested something (was the lighting system)
implementation with updates via osg::Image and osg::Texture -
not related to instancing at all, but the mentioned method. My
colleague then did benchmarking and the update of the Image
(and the texture) by OSG was terribly slow - the same thing
using raw OpenGL calls out-performed the one from OSG. I also
remember Robert implemented then the Vertex Attribute Divisor
wrapper for OSG so it might really need example of these with
various techniques ...</div>
</div>
</blockquote>
Thats right for data dynamically changed via texture. Static data is
incredibly fast however (I'm talking ~1mio trees @30Hz min) . <br>
Getting slightly off-topic here, but:<br>
Are you sure you had resizing and mipmapping disabled for the
texture/image? That is certainly a performance killer.<br>
<blockquote
cite="mid:CAO-+zi=y2v5=XtpzKrQK9CfPGqzS0NhhOszrQPADHAMmfa-DBw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div><br>
</div>
<div>Thanks for the ping :-)</div>
<div><br>
</div>
<div>Nick</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jul 22, 2015 at 1:59 PM,
Sebastian Messerschmidt <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:sebastian.messerschmidt@gmx.de"
target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:sebastian.messerschmidt@gmx.de">sebastian.messerschmidt@gmx.de</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Hi Nick, <br>
<br>
The implementation is almost to complicated. Using
instancing with osg::Image and a texture almost beats
all other implementations I've tested so far in terms of
complexity and performance.<br>
Maybe we should some more examples for this to osg.<br>
Cheers<span class="HOEnZb"><font color="#888888"><br>
Sebastian <br>
<br>
</font></span></div>
<blockquote type="cite"><span class="">
<div dir="ltr">Hi Luo,
<div><br>
</div>
<div>have a look at this paper - it is OSG related
with GL calls (In the latest OSG release there are
OSG wrappers for most of them). It will help you
with large number of instancing and controlling
each instance separately</div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://3dcgtutorials.blogspot.com/2013/09/instancing-with-openscenegraph-part-ii.html"
target="_blank">http://3dcgtutorials.blogspot.com/2013/09/instancing-with-openscenegraph-part-ii.html</a><br>
</div>
<div><br>
</div>
<div>Hope it helps</div>
<div>Nick</div>
</div>
</span>
<div>
<div class="h5">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jul 22, 2015 at
9:25 AM, Sebastian Messerschmidt <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:sebastian.messerschmidt@gmx.de"
target="_blank">sebastian.messerschmidt@gmx.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">Hi,<span><br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> Hi,<br>
<br>
I need to use cylinder to simulate the
“ladder”. So there are many cylinder to
create. I new a osg::Geode , and then use
it to new 10000 osg::MatrixTransform, all
these osg::MatrixTransform were added to
one group.<br>
<br>
But the program runs very very slow.<br>
</blockquote>
</span> Are you testing in debug mode?<span><br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> In fact I
create the same scene using opengl, the
program runs quickly.<br>
</blockquote>
</span> Are you using the osg::Shapedrawable
for the cylinder shape? Try to replace it with
a simple triangle for testing to see if the
geometry or the transforms are your
bottleneck.<br>
<br>
I'd use hw-instancing for this amount of
copies of a simple geometry or bake the
transformations into big geometries
representing hundreds of cylinders each.<br>
<br>
Also if the 10000 elements are spatially
separable and thus not all of them in the view
at the same time you should use some grouping
to balance your scenegraph. Simply putting
10000 transforms into one group most likely
will kill performance, as all children will
have to be traversed each frame.<span><br>
<br>
<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> <br>
How can I upgrade my program?<br>
thanks.<br>
</blockquote>
</span> Can you provide a more detailed
description or an example? Your question is
too open to get you specific answers.<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"><span> <br>
Thank you!<br>
<br>
Cheers,<br>
LUO<br>
<br>
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-- <br>
<div>trajce nikolov nick<br>
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