Avatar Impostors tech details - Revision history

Torley Linden: moved Avatar Impostors to Avatar Impostors tech details

2009-11-05T17:09:23Z

moved Avatar Impostors to Avatar Impostors tech details

← Older revision	Revision as of 10:09, 5 November 2009
(No difference)

Zai Lynch: /* Related Links */

2009-06-26T16:35:23Z

Zai Lynch: kb link

2009-04-29T18:10:38Z

kb link

← Older revision		Revision as of 11:10, 29 April 2009
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	There's no info display for impostor update periods or when an update is triggered. Would you like me to make one? It should be trivial to make impostors flash green on frames where they received an update and display the update period as debug text.		There's no info display for impostor update periods or when an update is triggered. Would you like me to make one? It should be trivial to make impostors flash green on frames where they received an update and display the update period as debug text.

			== Related Links==
			*{{slkb\|4766\|What are Avatar Impostors?}}

Zai Lynch: {{Help|Avatar=|Glossary=}}

2009-04-26T23:32:33Z

← Older revision		Revision as of 16:32, 26 April 2009
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	{{OSWikiFeatureNav}}		{{Help\|Avatar=\|Glossary=}}{{OSWikiFeatureNav}}
	=== How To ===		=== How To ===
	Avatar Impostors can be turned on or off from the Second Life '''Edit''' menu > '''Preferences...''' > '''Graphics''' > [X] '''Custom''' > Avatar Rendering: [X] '''Avatar Impostors'''		Avatar Impostors can be turned on or off from the Second Life '''Edit''' menu > '''Preferences...''' > '''Graphics''' > [X] '''Custom''' > Avatar Rendering: [X] '''Avatar Impostors'''

Ramzi Linden: /* Feature Design Document */

2009-03-05T17:36:10Z

Feature Design Document

← Older revision		Revision as of 10:36, 5 March 2009
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	{{OSWikiFeatureNav}}		{{OSWikiFeatureNav}}
			=== How To ===
			Avatar Impostors can be turned on or off from the Second Life '''Edit''' menu > '''Preferences...''' > '''Graphics''' > [X] '''Custom''' > Avatar Rendering: [X] '''Avatar Impostors'''

	=== Feature Design Document ===		=== Feature Design Document ===
	Avatar impostors replace the rendering of an avatar with a cached 2D rendering (sprite) of the avatar. The sprite is updated only when needed, thus reducing the total number of full avatar renders and improving performance.		Avatar impostors replace the rendering of an avatar with a cached 2D rendering (sprite) of the avatar. The sprite is updated only when needed, thus reducing the total number of full avatar renders and improving performance.

Ramzi Linden: /* Feature Design Document */

2008-11-10T23:28:19Z

Feature Design Document

← Older revision		Revision as of 16:28, 10 November 2008
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	=== Feature Design Document ===		=== Feature Design Document ===
	Avatar impostors replace the rendering of an avatar with a cached 2D rendering (sprite) of the avatar. The sprite is updated only when needed, thus reducing the total number of full avatar renders and improving performance.		Avatar impostors replace the rendering of an avatar with a cached 2D rendering (sprite) of the avatar. The sprite is updated only when needed, thus reducing the total number of full avatar renders and improving performance.

			[[Image:AvatarImpostor example.jpg\|500px]]

	==== Requirements ====		==== Requirements ====
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	* If more than 100 avatars are visible, only the closest 100 are rendered, plus avatars that are "transitioning" between visible and invisible.		* If more than 100 avatars are visible, only the closest 100 are rendered, plus avatars that are "transitioning" between visible and invisible.
	** To avoid flickering avatars against the background, avatars will fade out if they get too far away in the crowd.		** To avoid flickering avatars against the background, avatars will fade out if they get too far away in the crowd.


	=== Functional Spec ===		=== Functional Spec ===

Bridie Linden at 22:13, 10 November 2008

2008-11-10T22:13:33Z

@@ Line 1: / Line 1: @@
 {{OSWikiFeatureNav}}
 === Feature Design Document ===
-(none)
+Avatar impostors replace the rendering of an avatar with a cached 2D rendering (sprite) of the avatar.  The sprite is updated only when needed, thus reducing the total number of full avatar renders and improving performance.
 === Functional Spec ===

Dan Linden at 21:15, 3 December 2007

2007-12-03T21:15:01Z

← Older revision		Revision as of 14:15, 3 December 2007
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			{{OSWikiFeatureNav}}
			=== Feature Design Document ===
			(none)

			=== Functional Spec ===
			(none)

			=== Test scripts ===
			(none)

			=== Discussion for future improvements ===
			(none)

			=== Relationship to other features ===


			=== User Guides ===
			(none)




	An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency.		An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency.
	What are the rules?		What are the rules?

Dan Linden: New page: An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency. What are the rules? Impostors are cutouts, not translucency, so anything the avatar ...

2007-12-03T21:11:06Z

New page: An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency. What are the rules? Impostors are cutouts, not translucency, so anything the avatar ...

New page

An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency.
What are the rules?

Impostors are cutouts, not translucency, so anything the avatar is wearing that more than 50% transparent will not be rendered. The same thing happens for non-impostored geometry on a face-by-face basis for items that are very small on screen.
----

How can I tell if impostors are working?

Turn on Wireframe mode (ctrl-shift-R or Client>Rendering>Wireframe). Impostored avatar will not be visible as a wireframe.
----

how does the avatar detail slider affect the impostor distance?
how does the size of the avatar + attachments affect the impostor distance?
how do we measure the size of the avatar + attachments?
how often should the impostor update? how can we measure that?

The code for impostor update frequency is as such:

F32 impostor_area = 256.f*512.f*(8.125f - LLVOAvatar::sLODFactor*8.f);
if (visible && mPixelArea <= impostor_area)
{
mUpdatePeriod = llclamp((S32) sqrtf(impostor_area*4.f/mPixelArea), 2, 8);
visible = (LLDrawable::getCurrentFrame()+mID.mData[0])%mUpdatePeriod == 0 ? TRUE : FALSE;
}

If that visible BOOL comes out TRUE for a given frame, that avatar will get an animation update. LLVOAvatar::sLODFactor is the value that comes out of the avatar mesh detail slider. mPixelArea is the number of pixels being covered by the AABB that surrounds the avatar and all of its attachments.
If the AABB of the avatar hasn't changed significantly after an animation update, there is no impostor update (this prevents redundantly updating impostors for avatars that aren't moving).

There's no info display for impostor update periods or when an update is triggered. Would you like me to make one? It should be trivial to make impostors flash green on frames where they received an update and display the update period as debug text.

← Older revision		Revision as of 09:35, 26 June 2009
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	== Related Links==		== Related Links==
	*~~{{slkb\|4766\|~~What are Avatar Impostors?}}		*[[What are Avatar Impostors?]]

Avatar Impostors tech details - Revision history

Torley Linden: moved Avatar Impostors to Avatar Impostors tech details

Zai Lynch: /* Related Links */

Zai Lynch: kb link

Zai Lynch: {{Help|Avatar=*|Glossary=*}}

Ramzi Linden: /* Feature Design Document */

Ramzi Linden: /* Feature Design Document */

Bridie Linden at 22:13, 10 November 2008

Dan Linden at 21:15, 3 December 2007

Dan Linden: New page: An attachment (at some distance) is visible with 50% transparency and disappears at 51% transparency. What are the rules? Impostors are cutouts, not translucency, so anything the avatar ...

Zai Lynch: {{Help|Avatar=|Glossary=}}