Open Development User Group/Archive/2011-06-13-post-meeting

This is the conversation held after the Monday June13, 2011 Open Developers User Group ( updated WolfPup Lowenhar 14:08, 13 June 2011 (PDT))

Attendees List

• ArminWeatherHax (arminweatherhax)
• বরুনদাশ গুপ্তে (boroondas.gupte)
• FooBar (data.landau)
• FERRET (lestat.demain)
• Liisa Runo (liisa.runo)
• Phoenix-FirestormViewer Rocks (tankmaster.finesmith)
• Twisted Laws (twisted.laws)
• Wolfpup (wolfpup.lowenhar)

Transcript for Monday June 13, 2011

[08:08]	Wolfpup	the OenpSource https://bitbucket.org/lindenlab/llconvexdecompositionstub/overview
[08:08]	Wolfpup	the fact is that we need to be able to have it asctualy functional
[08:08]	ArminWeatherHax	libdirectfb has a very different version in opensuse and debian/like
[08:09]	FERRET	WHAT PHYSICS SYSTEM ARE WE GOING TO USE FOR IT?
[08:09]	FERRET	OOPS
[08:09]	FERRET	sorry was commenting code
[08:09]	Wolfpup	as ti stands right now that dose not do any thing at all and from what i heard @ the beta meeting mesh will be comeing to the main grind in about a month
[08:10]	Wolfpup	that is the question lestat
[08:10]	Wolfpup	and how are we going to get it merged in
[08:11]	Wolfpup	john's code is no longer do be considered as he is even sugesting to use HACD to replace his
[08:11]	FERRET	physX or cuda or is there another system?
[08:11]	Wolfpup	so that leave the bullet system and HACD
[08:12]	Wolfpup	cuda and physx are stricly nVida lestat
[08:12]	FERRET	ugh thats like saying havoc is purely linux
[08:12]	Wolfpup	we need some thing for ALL vid cards and Open Source
[08:12]	Phoenix-FirestormViewer Rocks	openCL
[08:13]	Wolfpup	the LL version of convex looks to be mainly dealing with the decomp with just a little physics
[08:15]	Twisted Laws	HACD looks better to use to me as its mostly just the part of whats in bullet system that we need ... http://sourceforge.net/projects/hacd/
[08:15]	বরুনদাশ গুপ্তে	I don't think there's need to have the convex decomposition run on the graphics card. It's a task ran once per upload. Not something running all the time.
[08:15]	Wolfpup	if we can come to a concensus on the source code to use we could then see if LL would import the code to the stub so that we are all useing the same code
[08:16]	FERRET	heh if u wanna wait 6 months sure...but i go by their kdu example
[08:16]	ArminWeatherHax	does the stub now compile without changes? (does now compile the stub without changes?)
[08:16]	Wolfpup	Lestat KDU is not open source
[08:16]	Twisted Laws	it doesn't seem so critical tho as there is an external method of accomplishing it
[08:17]	Twisted Laws	when i first looked at this i thought it was used more often then just the upload
[08:17]	বরুনদাশ গুপ্তে	Well, we don't need LL, at least in the beginning. Just clone the stub and declare one clone the 'official' repo for open source work on mesh decomposition.
[08:17]	Wolfpup	yes the stub compiles but you do not have and functionality as the calculations are not there
[08:18]	Wolfpup	well i already have a online set up i think
[08:18]	Wolfpup	yes i do
[08:18]	Wolfpup	https://bitbucket.org/WolfpupL/llconvexdecompositionos
[08:19]	ArminWeatherHax	the last time I compiled it it needed some changes https://github.com/ArminW/kokua-llconvexdecompositionstub/commits/master
[08:19]	Wolfpup	but all that has in it is the core from LL right now
[08:19]	বরুনদাশ গুপ্তে	I thought the core was what's missing and we just have the interface?
[08:19]	Wolfpup	there is no extrac code it it as yet
[08:20]	Wolfpup	your right Boroondas
[08:20]	Wolfpup	im just calling the interface the core for now as we have to work off theat
[08:21]	Wolfpup	as that is the 'core' connection
[08:23]	Wolfpup	so now the question is do we want to use the 'stable' bullet system or the 'alpha' HACD
[08:24]	FERRET	go with the stable
[08:24]	বরুনদাশ গুপ্তে	I'd go for HACD, so we don't have all the physics stuff on bord we won't ever need.
[08:24]	Twisted Laws	i vote for HACD
[08:25]	Wolfpup	the bullet system has some of the HACD incorperadted into the linear math lib that they use
[08:25]	বরুনদাশ গুপ্তে	into the linear math lib?
[08:25]	বরুনদাশ গুপ্তে	that doesn't make any sense
[08:25]	Wolfpup	we do not have to bring all of the bullet just the convex and linear
[08:27]	Wolfpup	well im seeing two people saying to use HACD directly any others?
[08:29]	Twisted Laws	hacd is an active opensource project (i think) and more closely related to what we need (i think)
[08:30]	বরুনদাশ গুপ্তে	has anyone looked at the interfaces of bullet and HACD so far and compared them to the interface in the stub? I guess the closer the match, the easier it'll be to write the glue between them.
[08:30]	Wolfpup	and bullet is useing in think=gs like blender which is what a lot of people use to make sculpties and mesh objects for SL with
[08:31]	Wolfpup	well the bullet system is still useing John's code and the interface seems more consistant withthe the LL interface
[08:32]	Wolfpup	from what i have seen
[08:32]	Wolfpup	but im no expert
[08:33]	Twisted Laws	sry, i must go, rl calls
[08:33]	Wolfpup	it would need some one with more codeing knowlage than me to know for certian
[08:33]	FooBar	b srr rl called me away
[08:34]	FooBar	reading ^^^^
[08:35]	FERRET	i still say go with the bullet system...its compatible and also must have fewer bugs :)
[08:36]	Wolfpup	Boroondas what do you think?
[08:37]	FERRET	besides...1 day someones going to have to write a decent building interface to use within SL itself
[08:37]	FooBar	well if its just conv and math from bullet i would agree with the fury and go bullet
[08:38]	বরুনদাশ গুপ্তে	FERRET, do you think a building interface would need viewer-side physics?
[08:38]	FooBar	its going to be a mess to start with and so stability will help
[08:38]	FERRET	to perform with any decent speed in a lagged environment like the sandboxes...definately
[08:38]	Wolfpup	Boroondas it might if the person in question is testing the object in a editing window
[08:39]	FooBar	from what i can make out physics is used to define the bounding box of the object so you cant walk through it
[08:39]	বরুনদাশ গুপ্তে	the other way around: physics might use bounding boxes to detect collisions
[08:40]	FooBar	ut im no coder my knowlage is very limited
[08:40]	FooBar	but*
[08:40]	Wolfpup	that is right data as it is noe sculpties have a bounding box the size of the prim if it was non-sculpted and mesh tightens that bounding box to the mesh its self
[08:42]	বরুনদাশ গুপ্তে	If you repeat that sentence(s?) with punctuation we might be able to understand them ...
[08:42]	FERRET	buries head laffin
[08:43]	বরুনদাশ গুপ্তে	?
[08:43]	Wolfpup	ok ill try again
[08:44]	Wolfpup	yes you are right data
[08:44]	FooBar	As it is no sculpties have a bounding box. The size of the prim, if it was non-sculpted. And mesh tightens that bounding box to the mesh its self
[08:45]	FooBar	.
[08:45]	Wolfpup	the bounding box of a sculpty is determaned by the non sculpted sixe of the object
[08:45]	বরুনদাশ গুপ্তে	ah
[08:45]	Wolfpup	mesh objects pull that bounding box closed to the mesh sculpty
[08:46]	বরুনদাশ গুপ্তে	i.e. sculpt map only affects visual shape, not physical.
[08:46]	বরুনদাশ গুপ্তে	?
[08:46]	FooBar	y (and)
[08:46]	Wolfpup	that is correct Boroondas
[08:47]	Wolfpup	where as mesh objects are a towpare sculpty
[08:47]	Wolfpup	the visual and the physical
[08:47]	বরুনদাশ গুপ্তে	kinda
[08:48]	বরুনদাশ গুপ্তে	mesh objects are of course not texture-driven in their (visual of physical) shape
[08:48]	FooBar	saying that tho, from what i can remember from the last time i ply with bullet, im not sure how well bullet actualy does that
[08:49]	FooBar	but its been a few years , so im sure there might have been improvements since then
[08:49]	বরুনদাশ গুপ্তে	Gotta go, tc all
[08:50]	Wolfpup	data if you get and build the bullet code there is a convex api text that you can 'play' with object in
[08:50]	বরুনদাশ গুপ্তে	if the comments on John's blog can be believed, bullet might switch to HACD: http://codesuppository.blogspot.com/2011/05/hacd-hierarchical-approximate-convex.html#c5916931305323549215
[08:51]	FooBar	yer, i was waiting to see which way to go b4 i did play,,
[08:52]	Liisa Runo	Kelly's unofficila Scripting OH: http://slurl.com/secondlife/Ambleside/154/97/22
[08:52]	FooBar	thanks liisa (Thanks Alice)
[08:52]	Wolfpup	well i have to goto the scrum meeting
[08:53]	FooBar	ok guys , im out have a good one (ok guys, im out have a good one)
[08:54]	FERRET	if ya ask me the 2nd line on his net site sez it all

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