[Opensim-dev] Fw: Fix for terrain editing spike problem

[dr scofield]

Fish Kungfu wrote:
> Excellent!!
>
>
> On Sun, Sep 14, 2008 at 10:20 AM, Mike Pitman <pitman at us.ibm.com
> <mailto:pitman at us.ibm.com>> wrote:
>
>     It didn't look like this post made it the first time.
>     ----- Forwarded by Mike Pitman/Watson/IBM on 09/14/2008 10:19 AM -----
>
>                             *Mike Pitman/Watson/IBM*
>
>                             09/13/2008 08:49 PM
>
>     	
>
>     To
>     	
>     opensim-dev at lists.berlios.de <mailto:opensim-dev at lists.berlios.de>
>
>     cc
>     	
>
>     Subject
>     	
>     Fix for terrain editing spike problemMike Pitman
>     <Notes://D01ML605/852562BD006ECBCC/32547D7F59F9E7E38525613200556E77/BAAFC8DD1E8BE50F852574C3006F05DB>
>
>
>     	
>
>     Hey Folks,
>
>     Mantis 0002187 contains a patch I submitted which fixes the
>     terrain spikes, and is the result of mostly a tuning operation on
>     the smooth and flatten tools. I dug in and found that the spikes
>     apparently result from smooth's overly aggressive iteration steps
>     toward the average curvature, which leads to an instability that
>     blows up the heights. I introduced a scaling factor to dampen the
>     'duration' parameter which tames progress and seems to keep things
>     stable.
>
>     I was no longer able to produce any spikes.
>
>     I also adjusted the brush size function to linear, as Adam
>     suggested, which seems to work much better. I settled on small
>     flatten being just enough to induce a narrow walkway on the side
>     of a mountain that an avatar can walk along, medium giving a nice
>     sized trail for an avatar, and large still useful for big jobs.
>
>     I left raise and lower alone, since fast response is good for bulk
>     work and didn't cause instabilities.
>
cool. unless someone beats me to it, i'll check it in tomorrow then. :-)

    cheers,
    dr scofield


>
>     -Mike Pitman/Rez Tone
>
>
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-- 
dr dirk husemann ---- math & computer science ---- ibm zurich research lab
RL: hud at zurich.ibm.com - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/ 
SL: drscofield at xyzzyxyzzy.net --------------------- http://xyzzyxyzzy.net/