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Chalice Yao · 04-02-2012, 09:04 AM

https://jira.secondlife.com/browse/SVC-7800

A little JIRA I just opened after noticing this.

Basically, objects get a horrible LI punishment if their linkset contains things like toruses with a 'prim' setting, and also contain child prims with the 'convex hull' setting.

So far so normal, but it seems said LI punishment also takes effect when the child prims are set to 'none'!

This is definitely a bug, as there should be no additional physics strain in that case at all, and the 'none' setting is actually very advantageous to the simulator.

EDIT:

Added an example. This will have 67 LI:

root: cube, prim
child: torus, prim
child: whatever, none

Which is expected if said 'none' is convex hull, but the 'none' setting shouldn't screw it up like that.

Adeon Writer · 04-02-2012, 09:15 AM

Good luck. :/ I have a feeling they won't do it because people will use this to fit a TON more prims on their land.

Chalice Yao · 04-02-2012, 09:17 AM

Even if they don't want that, the none prims should add a LI of 1 in that case.

Adeon Writer · 04-02-2012, 09:24 AM

Oh yes, no dispute the current system is wrong. It makes mixed content a nightmare.

Remember when it was said "Even if you can't model, you will benefit from mesh because you can use them in your builds as custom primitive shapes!"

Yeah, no.

Chalice Yao · 04-02-2012, 09:28 AM

Yeeeah

Beezle Warburton · 04-02-2012, 09:40 AM

I showed someone that my mesh tiki-head plus a spiraled and hollowed torus could have a LI of 1536...

Adeon Writer · 04-02-2012, 09:50 AM

The best thing to do is just link a simple mesh tetrahedron to a torus. That should show the ridiculousness at it's worst, I think. And cut up the torus so it has almost no verts left.

TatianaDokuchic · 04-02-2012, 11:24 AM

Voted & watching. Thanks for this. I was always shocked at the results I get when testing out "none". Makes no sense to me at all.

Davido Chrome · 09-24-2012, 09:04 AM

Toruses are freaky inefficient as physics shapes. So this actually makes sense...

Gabriell Anatra · 09-24-2012, 10:10 AM

It makes sense to have a non-physics cost exaggerated because of physics?

I am not sure I've ever used non-physics prims in a build as it almost never does anything good and usually sends it into the trash heap.

Innula Zenovka · 09-24-2012, 10:22 AM

As I understand it, the issue is that, by setting one of the child prims to either convex hull or none, that ensures the mesh accounting system is used for the whole build.

The physics cost of a torus left as PRIM_PHYSICS_SHAPE_PRIM (in this example, the root prim) is very high. Switch it to PRIM_PHYSICS_SHAPE_CONVEX and the cost goes down.

04-02-2012, 09:04 AM	#1 (permalink)
Chalice Yao The Purple HEYOO! Join Date: Dec 2007 Location: Somewhere purple, Germany Posts: 7,654 My Mood: SL Join Date: 20. January 2007 Client: NaCl	[SVC-7800] 'None' physics setting getting the same punishing LI calculations for com https://jira.secondlife.com/browse/SVC-7800 A little JIRA I just opened after noticing this. Basically, objects get a horrible LI punishment if their linkset contains things like toruses with a 'prim' setting, and also contain child prims with the 'convex hull' setting. So far so normal, but it seems said LI punishment also takes effect when the child prims are set to 'none'! This is definitely a bug, as there should be no additional physics strain in that case at all, and the 'none' setting is actually very advantageous to the simulator. EDIT: Added an example. This will have 67 LI: root: cube, prim child: torus, prim child: whatever, none Which is expected if said 'none' is convex hull, but the 'none' setting shouldn't screw it up like that. __________________ "Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?" - George Carlin Last edited by Chalice Yao; 04-02-2012 at 09:12 AM.

04-02-2012, 09:40 AM	#6 (permalink)
Beezle Warburton You look tasty. Beeble Bubble Bimbo and Griffer Alt but not a Dog Chewy Join Date: Aug 2007 Posts: 11,205 My Mood: SL Join Date: October 24, 2006 Client: Frestorm, Imprudence Blog Entries: 3	I showed someone that my mesh tiki-head plus a spiraled and hollowed torus could have a LI of 1536... __________________ SL easily allows you to accidentally your entire pants. -- Adeon Writer

04-02-2012, 11:24 AM	#8 (permalink)
TatianaDokuchic Senior Member Tea swilling lurker Join Date: Oct 2009 Posts: 186 My Mood: SL Join Date: Feb 2008 Business: Tatiana's Tea Room	Voted & watching. Thanks for this. I was always shocked at the results I get when testing out "none". Makes no sense to me at all. __________________ Fine French Antiques ♥.•:¨¨:• ♥ Tatiana's Tea Room ♥.•:¨¨:• ♥ Surround Yourself with Classic Beauty

09-24-2012, 10:22 AM	#11 (permalink)
Innula Zenovka Nasty Brit Wants things Join Date: May 2009 Posts: 6,956 SL Join Date: 17 June 2007 Business: Something Spunky	As I understand it, the issue is that, by setting one of the child prims to either convex hull or none, that ensures the mesh accounting system is used for the whole build. The physics cost of a torus left as PRIM_PHYSICS_SHAPE_PRIM (in this example, the root prim) is very high. Switch it to PRIM_PHYSICS_SHAPE_CONVEX and the cost goes down. __________________

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04-02-2012, 09:15 AM	#2 (permalink)
Adeon Writer Senior Member Join Date: Apr 2010 Posts: 6,102	Good luck. :/ I have a feeling they won't do it because people will use this to fit a TON more prims on their land.

04-02-2012, 09:17 AM	#3 (permalink)
Chalice Yao The Purple HEYOO! Join Date: Dec 2007 Location: Somewhere purple, Germany Posts: 7,654 My Mood: SL Join Date: 20. January 2007 Client: NaCl	Even if they don't want that, the none prims should add a LI of 1 in that case.

04-02-2012, 09:24 AM	#4 (permalink)
Adeon Writer Senior Member Join Date: Apr 2010 Posts: 6,102	Oh yes, no dispute the current system is wrong. It makes mixed content a nightmare. Remember when it was said "Even if you can't model, you will benefit from mesh because you can use them in your builds as custom primitive shapes!" Yeah, no.

04-02-2012, 09:28 AM	#5 (permalink)
Chalice Yao The Purple HEYOO! Join Date: Dec 2007 Location: Somewhere purple, Germany Posts: 7,654 My Mood: SL Join Date: 20. January 2007 Client: NaCl	Yeeeah

04-02-2012, 09:50 AM	#7 (permalink)
Adeon Writer Senior Member Join Date: Apr 2010 Posts: 6,102	The best thing to do is just link a simple mesh tetrahedron to a torus. That should show the ridiculousness at it's worst, I think. And cut up the torus so it has almost no verts left.

09-24-2012, 09:04 AM	#9 (permalink)
Davido Chrome Junior Member Join Date: Sep 2012 Posts: 19	Toruses are freaky inefficient as physics shapes. So this actually makes sense...

09-24-2012, 10:10 AM	#10 (permalink)
Gabriell Anatra Imp Who are you? Join Date: Nov 2010 Location: Somewhere else. Posts: 2,289 SL Join Date: Early '06 or late '05, not sure. Client: Singularity	It makes sense to have a non-physics cost exaggerated because of physics? I am not sure I've ever used non-physics prims in a build as it almost never does anything good and usually sends it into the trash heap.

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