<div dir="ltr">Thanks Ai!<br><div><br>It is interesting that we were doing this apparently really well 10 years ago! Apparently in so many ways we have to reinvent the wheel over and over!<br><br></div><div>Maybe we need to get ahold of these guys and see if they will share...<br><br></div><div>Steve LaVigne<br></div><div>A Dimension Beyond, Inc.<br></div><div><a href="http://www.adimensionbeyond.com">www.adimensionbeyond.com</a><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 15, 2015 at 5:00 AM, <span dir="ltr"><<a href="mailto:opensim-dev-request@opensimulator.org" target="_blank">opensim-dev-request@opensimulator.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Opensim-dev mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: New MOSES Physics Video (Ai Austin)<br>
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Message: 1<br>
Date: Wed, 15 Apr 2015 09:59:23 +0100<br>
From: Ai Austin <<a href="mailto:ai.ai.austin@gmail.com">ai.ai.austin@gmail.com</a>><br>
To: <a href="mailto:opensim-dev@opensimulator.org">opensim-dev@opensimulator.org</a><br>
Subject: Re: [Opensim-dev] New MOSES Physics Video<br>
Message-ID: <<a href="mailto:552e28de.ad3ec20a.7807.ffffc879@mx.google.com">552e28de.ad3ec20a.7807.ffffc879@mx.google.com</a>><br>
Content-Type: text/plain; charset="us-ascii"; format=flowed<br>
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I saw the suggestion that explosion "physical" effects like this<br>
might be dealt with locally (e.g. in the same was as particle visual<br>
effects) in each viewer and not as a shared phenomenon where the<br>
position of all the parts are updated in everyone's viewer.<br>
<br>
Snow and lighting visual effects often can be approximated and<br>
everyone has roughly the same sort of shared experience, modulo the<br>
allowable and supportable graphical quality in each viewer..<br>
<br>
I am reminded though of an exercise I took part in using the Forterra<br>
OLIVE when that was still being actively developed (I think it got<br>
sold to SAIC and I have not heard much aboit it since)... it was a<br>
training exercise for military staff manning a checkpoint, and I was<br>
an observer through my avatar. The military folks being trained were<br>
to watch fro suspicious activity, but also treat all people at the<br>
checkpoint well... and also to deal with the aftermath of an attack..<br>
rescue helicopter coming in with dust clouds from the ground and<br>
all... it was very realistic. And I was very surprised, even though<br>
my avatar was partially protected from the checkpoint area by a solid<br>
wall, that an explosion injured me... the pieces flying hiring my arm<br>
and me being rendered unconscious! Viewer blurring over and me being<br>
almost out of it.<br>
<br>
This is an example of the use of virtual worlds where the shared<br>
experience of what debris from an explosion goes and who it hits and<br>
when is necessary. And I think may be typical of the sort of thing<br>
MOSES is seeking to achieve for realistic simulated<br>
training. Interestingly Forterra OLIVE was itself originally<br>
developed on a project for the US Army also more than a decade ago.<br>
<br>
Clearly there needs to be some consideration of the granularity of<br>
physics and position updates across all users that are present in the<br>
area and a consideration of how many parts of an exploding object<br>
can be made physical and updates sent and at what rate. This could<br>
be a simply enormous quantity of data and updates as others have<br>
pointed out... so its not surprising that more avatars leads to<br>
slower performance. Crashes nonetheless indicates something that is amiss.<br>
<br>
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End of Opensim-dev Digest, Vol 13, Issue 13<br>
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