[Opensim-dev] BulletSim update for Windows and linkset crashes

[Aine]

I've encountered this issue and my solution was a relatively straight-forward one. In the NPC script's changed event (change & CHANGED_REGION_START) I set a timer of 120 sec (or pick a suitable value) and then do the rez & sit from the timer. If I need that timer for something else later, I just set a global flag for it first (integer flag timerToRezNpc=TRUE) and test that at the top of my timer event...if true I do the rez then set the new timer (if needed) and if false proceed to whatever else the timer is normally needed for. That 120sec initial buffer gives the region time to finish processing the bulk of its start-up stuff before hitting it with the NPC activation.

 

From: opensim-dev-bounces at opensimulator.org [mailto:opensim-dev-bounces at opensimulator.org] On Behalf Of Mister Blue
Sent: Monday, December 01, 2014 10:48 AM
To: opensim-dev
Subject: Re: [Opensim-dev] BulletSim update for Windows and linkset crashes

 

Large meshes can take a while to be converted into physical hulls[1]. I notice this with something like Nebadon's racer (linkset of meshes) -- riding the car makes it physical and the CPU maxes out for a few seconds and the car is unridable until it is meshed.

 

So, if there is a problem, it could be that the vehicle mesh has to be read in (from cache or asset store), converted into a mesh, then converted into a hull. All the while, your NPC is trying to sit on it.

 

There is no programatic way to tell if a linkset is fully physical and operational. All I can suggest is adding some delays if there are problems.

 

-- mb

 

[1] If you don't supply a physics, hull representation of the mesh (possible with the mesh file format), BulletSim uses a HACD algorithm to turn the mesh into a set of convex hulls. This algorithm is recursive and, sometimes, slow.

 

On Mon, Dec 1, 2014 at 5:45 AM, Ai Austin <ai.ai.austin at gmail.com> wrote:

At 12:00 01/12/2014, Mister Blue wrote:

I just checked into the 'master' branch an updated version of BulletSim
that hopefully fixes Mantis 7371 [1] and Mantis 7364 [2] and 7191 [3]. The
changes are a new compilation that seems to fix the Windows mesh crash and
additionally adds 'incomplete linkset' logic that should reduce the errors
caused by linksets waiting for assets to be fetched.

I'm sure the bleeding edge testers will find the problems



Thanks Mister Blue... I will test soon on Openvue and Ailand grids.

I have a question... in one region I have an NPC that is automatically refreshed after a new OpenSim version is installed and restarted.... and the behaviour of this NPC after its created i to immediately sit in the pilot seat or a vehicle that itself is a very complex multi-part mesh (my Supercar test mesh)

Could that cause any specific issues on fresh OpenSim build for region startup if the linkset is large and postboy delayed past the point where the NPC attempts the automated sit down?


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